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Title: A review on the fatigue behavior of Ti-6Al-4V fabricated by electron beam melting additive manufacturing

Abstract

Electron beam melting (EBM) is a swiftyly-developing metal additive manufacturing process that holds significant interest in the aerospace and biomedical industries for the high-strength titanium alloy, Ti-6Al-4V. These industries have fatigue-limited applications, yet a lack of understanding of the EBM process-microstructure-fatigue relationships limit widespread use and presents challenges for certification. In this review, uniaxial fatigue data was collected and the effects of build orientation, surface roughness, and hot-isostatic pressing are linked to the fatigue properties highlighting microstructure, defects, and failure mechanisms. The observations and conclusions are supported by statistical analysis using the mean fatigue life obtained by the Statistical Fatigue-Limit Model. Both EBM-process and post-process structure relationships are discussed in order to identify the best-practice for fatigue-resistant design. The performance of the EBM material is compared to conventionally manufactured Ti-6Al-4V and possible methods to increase the fatigue resistance are discussed. Anisotropic fatigue behavior was observed in as-fabricated parts and no statistical distinction was found in the fatigue performance of HIPed and as-fabricated material provided the same as-fabricated rough surface condition. However, comparable fatigue life to traditionally manufactured lamellar Ti-6Al-4V is achieved when both post-process HIP and machining are applied to EBM-fabricated parts.

Authors:
 [1]; ORCiD logo [2];  [3]; ORCiD logo [2]; ORCiD logo [2];  [4];  [4]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Ohio Univ., Athens, OH (United States)
  4. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office
OSTI Identifier:
1564171
Alternate Identifier(s):
OSTI ID: 1761216
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
International Journal of Fatigue
Additional Journal Information:
Journal Volume: 119; Journal Issue: C; Journal ID: ISSN 0142-1123
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Electron beam melting; Titanium; High cycle fatigue; S-N curves; Surface roughness; Fatigue crack initiation; Defects; Fatigue strength

Citation Formats

Chern, Andrew H., Nandwana, Peeyush, Yuan, Tao, Kirka, Michael M., Dehoff, Ryan R., Liaw, Peter K., and Duty, Chad E.. A review on the fatigue behavior of Ti-6Al-4V fabricated by electron beam melting additive manufacturing. United States: N. p., 2018. Web. https://doi.org/10.1016/j.ijfatigue.2018.09.022.
Chern, Andrew H., Nandwana, Peeyush, Yuan, Tao, Kirka, Michael M., Dehoff, Ryan R., Liaw, Peter K., & Duty, Chad E.. A review on the fatigue behavior of Ti-6Al-4V fabricated by electron beam melting additive manufacturing. United States. https://doi.org/10.1016/j.ijfatigue.2018.09.022
Chern, Andrew H., Nandwana, Peeyush, Yuan, Tao, Kirka, Michael M., Dehoff, Ryan R., Liaw, Peter K., and Duty, Chad E.. Mon . "A review on the fatigue behavior of Ti-6Al-4V fabricated by electron beam melting additive manufacturing". United States. https://doi.org/10.1016/j.ijfatigue.2018.09.022. https://www.osti.gov/servlets/purl/1564171.
@article{osti_1564171,
title = {A review on the fatigue behavior of Ti-6Al-4V fabricated by electron beam melting additive manufacturing},
author = {Chern, Andrew H. and Nandwana, Peeyush and Yuan, Tao and Kirka, Michael M. and Dehoff, Ryan R. and Liaw, Peter K. and Duty, Chad E.},
abstractNote = {Electron beam melting (EBM) is a swiftyly-developing metal additive manufacturing process that holds significant interest in the aerospace and biomedical industries for the high-strength titanium alloy, Ti-6Al-4V. These industries have fatigue-limited applications, yet a lack of understanding of the EBM process-microstructure-fatigue relationships limit widespread use and presents challenges for certification. In this review, uniaxial fatigue data was collected and the effects of build orientation, surface roughness, and hot-isostatic pressing are linked to the fatigue properties highlighting microstructure, defects, and failure mechanisms. The observations and conclusions are supported by statistical analysis using the mean fatigue life obtained by the Statistical Fatigue-Limit Model. Both EBM-process and post-process structure relationships are discussed in order to identify the best-practice for fatigue-resistant design. The performance of the EBM material is compared to conventionally manufactured Ti-6Al-4V and possible methods to increase the fatigue resistance are discussed. Anisotropic fatigue behavior was observed in as-fabricated parts and no statistical distinction was found in the fatigue performance of HIPed and as-fabricated material provided the same as-fabricated rough surface condition. However, comparable fatigue life to traditionally manufactured lamellar Ti-6Al-4V is achieved when both post-process HIP and machining are applied to EBM-fabricated parts.},
doi = {10.1016/j.ijfatigue.2018.09.022},
journal = {International Journal of Fatigue},
number = C,
volume = 119,
place = {United States},
year = {2018},
month = {9}
}

Journal Article:

Citation Metrics:
Cited by: 24 works
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Figures / Tables:

Figure 1 Figure 1: Optical micrographs of EBM manufactured Ti-6Al-4V where (a) is an image of the x-y plane and (b) is an image of the z/build direction (used with permission).

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Works referenced in this record:

Electron beam melting of Ti–48Al–2Cr–2Nb alloy: Microstructure and mechanical properties investigation
journal, June 2011


Metal Additive Manufacturing: A Review
journal, April 2014


Dynamic tensile behavior of electron beam additive manufactured Ti6Al4V
journal, August 2015

  • Rodriguez, O. L.; Allison, P. G.; Whittington, W. R.
  • Materials Science and Engineering: A, Vol. 641
  • DOI: 10.1016/j.msea.2015.06.069

Fabrication and characterization of porous Ti6Al4V parts for biomedical applications using electron beam melting process
journal, February 2009


Electrical discharge machining of electron beam melting formed shrouded blisk
journal, March 2016

  • Liang, Wei; Kang, Xiaoming; Zhao, Wansheng
  • The International Journal of Advanced Manufacturing Technology, Vol. 87, Issue 5-8
  • DOI: 10.1007/s00170-016-8545-0

Mechanical evaluation of porous titanium (Ti6Al4V) structures with electron beam melting (EBM)
journal, April 2010

  • Parthasarathy, Jayanthi; Starly, Binil; Raman, Shivakumar
  • Journal of the Mechanical Behavior of Biomedical Materials, Vol. 3, Issue 3
  • DOI: 10.1016/j.jmbbm.2009.10.006

Microstructure and anisotropic mechanical properties of EBM manufactured Inconel 718 and effects of post heat treatments
journal, May 2017


Characterization and comparison of materials produced by Electron Beam Melting (EBM) of two different Ti–6Al–4V powder fractions
journal, December 2013


Microstructural Architecture, Microstructures, and Mechanical Properties for a Nickel-Base Superalloy Fabricated by Electron Beam Melting
journal, June 2011

  • Murr, L. E.; Martinez, E.; Gaytan, S. M.
  • Metallurgical and Materials Transactions A, Vol. 42, Issue 11
  • DOI: 10.1007/s11661-011-0748-2

Preliminary fabrication and characterization of electron beam melted Ti–6Al–4V customized dental implant
journal, May 2017

  • Ramakrishnaiah, Ravikumar; Al kheraif, Abdulaziz Abdullah; Mohammad, Ashfaq
  • Saudi Journal of Biological Sciences, Vol. 24, Issue 4
  • DOI: 10.1016/j.sjbs.2016.05.001

Electron Beam Melting Manufacturing Technology for Individually Manufactured Jaw Prosthesis: A Case Report
journal, August 2016

  • Suska, Felicia; Kjeller, Göran; Tarnow, Peter
  • Journal of Oral and Maxillofacial Surgery, Vol. 74, Issue 8
  • DOI: 10.1016/j.joms.2016.03.046

The metallurgy and processing science of metal additive manufacturing
journal, March 2016


Building new entities from existing titanium part by electron beam melting: microstructures and mechanical properties
journal, November 2015

  • Mandil, Guillaume; Le, Van Thao; Paris, Henri
  • The International Journal of Advanced Manufacturing Technology, Vol. 85, Issue 5-8
  • DOI: 10.1007/s00170-015-8049-3

Overview of Materials Qualification Needs for Metal Additive Manufacturing
journal, January 2016


Effects of heat treatments on microstructure and properties of Ti-6Al-4V ELI alloy fabricated by electron beam melting (EBM)
journal, February 2017

  • Galarraga, Haize; Warren, Robert J.; Lados, Diana A.
  • Materials Science and Engineering: A, Vol. 685
  • DOI: 10.1016/j.msea.2017.01.019

Review of Mechanical Properties of Ti-6Al-4V Made by Laser-Based Additive Manufacturing Using Powder Feedstock
journal, December 2015


Metal Additive Manufacturing: A Review of Mechanical Properties
journal, July 2016


Mechanical properties of titanium-based Ti–6Al–4V alloys manufactured by powder bed additive manufacture
journal, April 2016


Additive manufacturing of metals: a brief review of the characteristic microstructures and properties of steels, Ti-6Al-4V and high-entropy alloys
journal, January 2017

  • Gorsse, Stéphane; Hutchinson, Christopher; Gouné, Mohamed
  • Science and Technology of Advanced Materials, Vol. 18, Issue 1
  • DOI: 10.1080/14686996.2017.1361305

Critical assessment of the fatigue performance of additively manufactured Ti–6Al–4V and perspective for future research
journal, April 2016


A Review of the Fatigue Properties of Additively Manufactured Ti-6Al-4V
journal, January 2018


Fatigue testing of electron beam-melted Ti-6Al-4V ELI alloy for dental implants
journal, October 2012

  • Joshi, Gaurav V.; Duan, Yuanyuan; Neidigh, John
  • Journal of Biomedical Materials Research Part B: Applied Biomaterials, Vol. 101B, Issue 1
  • DOI: 10.1002/jbm.b.32825

Microstructure, static properties, and fatigue crack growth mechanisms in Ti-6Al-4V fabricated by additive manufacturing: LENS and EBM
journal, November 2016


Effect of surface roughness on fatigue performance of additive manufactured Ti–6Al–4V
journal, May 2015


Fatigue performance of additive manufactured TiAl6V4 using electron and laser beam melting
journal, January 2017


Fatigue behaviour of notched additive manufactured Ti6Al4V with as-built surfaces
journal, August 2017


Microstructure and mechanical properties of Ti‐6Al‐4V produced by electron beam melting of pre‐alloyed powders
journal, May 2009

  • Facchini, Luca; Magalini, Emanuele; Robotti, Pierfrancesco
  • Rapid Prototyping Journal, Vol. 15, Issue 3
  • DOI: 10.1108/13552540910960262

Process window for electron beam melting of Ti-6Al-4V
journal, August 2015


Effects of post-processing on cyclic fatigue response of a titanium alloy additively manufactured by electron beam melting
journal, January 2017


Fatigue crack initiation in alpha-beta titanium alloys
journal, June 1997


Frequency and stress ratio effects in high cycle fatigue of Ti-6Al-4V
journal, August 1999


Surface crack initiation in pure titanium under various stress frequencies
journal, September 1994


Influence of loading frequency on implant failure under cyclic fatigue conditions
journal, November 2009


Effect of stress frequency on fatigue crack initiation in titanium
journal, January 1988


The Origin of Microstructural Diversity, Texture, and Mechanical Properties in Electron Beam Melted Ti-6Al-4V
journal, August 2010

  • Al-Bermani, S. S.; Blackmore, M. L.; Zhang, W.
  • Metallurgical and Materials Transactions A, Vol. 41, Issue 13
  • DOI: 10.1007/s11661-010-0397-x

Microstructures and mechanical properties of electron beam-rapid manufactured Ti–6Al–4V biomedical prototypes compared to wrought Ti–6Al–4V
journal, February 2009


Effect of build geometry on the β-grain structure and texture in additive manufacture of Ti6Al4V by selective electron beam melting
journal, October 2013


Microstructures and Mechanical Properties of Ti6Al4V Parts Fabricated by Selective Laser Melting and Electron Beam Melting
journal, August 2013

  • Rafi, H. K.; Karthik, N. V.; Gong, Haijun
  • Journal of Materials Engineering and Performance, Vol. 22, Issue 12
  • DOI: 10.1007/s11665-013-0658-0

Comparison of the fatigue and fracture of α+β and β titanium alloys
journal, November 2001


Effect of microstructure on the fatigue properties of Ti–6Al–4V titanium alloys
journal, April 2013


Influence of microstructure on high-cycle fatigue of Ti-6Al-4V: Bimodal vs. lamellar structures
journal, March 2002

  • Nalla, R. K.; Ritchie, R. O.; Boyce, B. L.
  • Metallurgical and Materials Transactions A, Vol. 33, Issue 3
  • DOI: 10.1007/s11661-002-0160-z

The effect of bi‐modal and lamellar microstructures of Ti‐6Al‐4V on the behaviour of fatigue cracks emanating from edge‐notches
journal, September 2004


Influence of microstructure [alpha+beta and beta] on very high cycle fatigue behaviour of Ti-6Al-4V alloy
journal, February 2017


Influence of processing on microstructure and mechanical properties of (α+β) titanium alloys
journal, March 1998


Observations on microstructurally sensitive fatigue crack growth in a widmanstätten Ti-6Al-4V alloy
journal, November 1977

  • Yoder, G. R.; Cooley, L. A.; Crooker, T. W.
  • Metallurgical Transactions A, Vol. 8, Issue 11
  • DOI: 10.1007/BF02646877

Effects of scanning parameters on material deposition during Electron Beam Selective Melting of Ti-6Al-4V powder
journal, March 2015


Fatigue properties of a titanium alloy (Ti–6Al–4V) fabricated via electron beam melting (EBM): Effects of internal defects and residual stress
journal, January 2017


Modelling and simulation of electron beam melting
journal, December 2009


Recyclability Study on Inconel 718 and Ti-6Al-4V Powders for Use in Electron Beam Melting
journal, October 2015

  • Nandwana, Peeyush; Peter, William H.; Dehoff, Ryan R.
  • Metallurgical and Materials Transactions B, Vol. 47, Issue 1
  • DOI: 10.1007/s11663-015-0477-9

Powder recyclability in electron beam melting for aeronautical use
journal, March 2015

  • Petrovic, Vojislav; Niñerola, Rubén
  • Aircraft Engineering and Aerospace Technology, Vol. 87, Issue 2
  • DOI: 10.1108/AEAT-11-2013-0212

Predictive Simulation of Process Windows for Powder Bed Fusion Additive Manufacturing: Influence of the Powder Bulk Density
journal, September 2017

  • Rausch, Alexander; Küng, Vera; Pobel, Christoph
  • Materials, Vol. 10, Issue 10
  • DOI: 10.3390/ma10101117

Effect of Powder Reuse Times on Additive Manufacturing of Ti-6Al-4V by Selective Electron Beam Melting
journal, February 2015


Effect of processing parameters of electron beam melting machine on properties of Ti-6Al-4V parts
journal, April 2016


Effect of process parameters settings and thickness on surface roughness of EBM produced Ti‐6Al‐4V
journal, July 2012


In situ flaw detection by IR‐imaging during electron beam melting
journal, June 2012

  • Schwerdtfeger, Jan; Singer, Robert F.; Körner, Carolin
  • Rapid Prototyping Journal, Vol. 18, Issue 4
  • DOI: 10.1108/13552541211231572

Effect of melt parameters on density and surface roughness in electron beam melting of gamma titanium aluminide alloy
journal, April 2017

  • Mohammad, Ashfaq; Al-Ahmari, Abdurahman Mushabab; AlFaify, Abdullah
  • Rapid Prototyping Journal, Vol. 23, Issue 3
  • DOI: 10.1108/RPJ-12-2014-0187

The effect of EBM process parameters upon surface roughness
journal, April 2016

  • Klingvall Ek, Rebecca; Rännar, Lars-Erik; Bäckstöm, Mikael
  • Rapid Prototyping Journal, Vol. 22, Issue 3
  • DOI: 10.1108/RPJ-10-2013-0102

Beam speed effects on Ti–6Al–4V microstructures in electron beam additive manufacturing
journal, August 2014

  • Gong, Xibing; Lydon, James; Cooper, Kenneth
  • Journal of Materials Research, Vol. 29, Issue 17
  • DOI: 10.1557/jmr.2014.125

Processing window and evaporation phenomena for Ti–6Al–4V produced by selective electron beam melting
journal, September 2014


Electron beam melted Ti–6Al–4V: Microstructure, texture and mechanical behavior of the as-built and heat-treated material
journal, January 2016

  • de Formanoir, Charlotte; Michotte, Sébastien; Rigo, Olivier
  • Materials Science and Engineering: A, Vol. 652
  • DOI: 10.1016/j.msea.2015.11.052

The Effect of Scan Length on the Structure and Mechanical Properties of Electron Beam-Melted Ti-6Al-4V
journal, November 2016

  • Everhart, Wesley; Dinardo, Joseph; Barr, Christian
  • Metallurgical and Materials Transactions A, Vol. 48, Issue 2
  • DOI: 10.1007/s11661-016-3866-z

Evaluation of microstructural development in electron beam melted Ti-6Al-4V
journal, March 2012


Graded microstructure and mechanical properties of additive manufactured Ti–6Al–4V via electron beam melting
journal, September 2015


Geometry dependence of microstructure and microhardness for selective electron beam-melted Ti–6Al–4V parts
journal, July 2016


An experimental and simulation study on build thickness dependent microstructure for electron beam melted Ti–6Al–4V
journal, October 2015


Fatigue Life of Titanium Alloys Fabricated by Additive Layer Manufacturing Techniques for Dental Implants
journal, October 2012

  • Chan, Kwai S.; Koike, Marie; Mason, Robert L.
  • Metallurgical and Materials Transactions A, Vol. 44, Issue 2
  • DOI: 10.1007/s11661-012-1470-4

Electron Beam Additive Manufacturing of Titanium Components: Properties and Performance
journal, November 2013

  • Edwards, P.; O'Conner, A.; Ramulu, M.
  • Journal of Manufacturing Science and Engineering, Vol. 135, Issue 6
  • DOI: 10.1115/1.4025773

Characterization and analysis of surface notches on Ti-alloy plates fabricated by additive manufacturing techniques
journal, October 2015


A fractographic study exploring the relationship between the low cycle fatigue and metallurgical properties of laser metal wire deposited Ti–6Al–4V
journal, June 2016


The Effects of Machined Workpiece Surface Integrity on the Fatigue Life of TC21 Titanium Alloy
journal, April 2012


Multiscale fatigue crack observations on Ti–6Al–4V
journal, May 2011


Mechanical Properties of Ti-6Al-4V Fabricated by Electron Beam Melting
journal, August 2016


Grain Structure Control of Additively Manufactured Metallic Materials
journal, November 2017

  • Yan, Fuyao; Xiong, Wei; Faierson, Eric
  • Materials, Vol. 10, Issue 11
  • DOI: 10.3390/ma10111260

Comparison of Residual Stresses in Inconel 718 Simple Parts Made by Electron Beam Melting and Direct Laser Metal Sintering
journal, January 2015

  • Sochalski-Kolbus, L. M.; Payzant, E. A.; Cornwell, P. A.
  • Metallurgical and Materials Transactions A, Vol. 46, Issue 3
  • DOI: 10.1007/s11661-014-2722-2

Fatigue properties of a dental implant produced by electron beam melting ® (EBM)
journal, December 2015


Empirical Approach to Understanding the Fatigue Behavior of Metals Made Using Additive Manufacturing
journal, April 2016

  • Witkin, David B.; Albright, Thomas V.; Patel, Dhruv N.
  • Metallurgical and Materials Transactions A, Vol. 47, Issue 8
  • DOI: 10.1007/s11661-016-3501-z

The HCF behavior and life variability of a Ti-6Al-4V alloy with transverse texture
journal, April 2017


Effects of Pore Position in Depth on Stress/Strain Concentration and Fatigue Crack Initiation
journal, November 2011

  • Xu, Zhiqiang; Wen, Wei; Zhai, Tongguang
  • Metallurgical and Materials Transactions A, Vol. 43, Issue 8
  • DOI: 10.1007/s11661-011-0947-x

Fundamental aspects of hot isostatic pressing: An overview
journal, December 2000


Densification of titanium powder during hot isostatic pressing
journal, July 1988

  • Lograsso, B. K.; Koss, D. A.
  • Metallurgical Transactions A, Vol. 19, Issue 7
  • DOI: 10.1007/BF02645145

Fatigue behaviour of additive manufactured Ti6Al4V, with as-built surfaces, exposed to variable amplitude loading
journal, October 2017


Microstructure-Tensile Properties Correlation for the Ti-6Al-4V Titanium Alloy
journal, February 2015

  • Shi, Xiaohui; Zeng, Weidong; Sun, Yu
  • Journal of Materials Engineering and Performance, Vol. 24, Issue 4
  • DOI: 10.1007/s11665-015-1437-x

Crystallography of Fatigue Crack Initiation and Growth in Fully Lamellar Ti-6Al-4V
journal, November 2009

  • Pilchak, A. L.; Williams, R. E. A.; Williams, J. C.
  • Metallurgical and Materials Transactions A, Vol. 41, Issue 1
  • DOI: 10.1007/s11661-009-0064-2

Additive manufacturing of fatigue resistant materials: Challenges and opportunities
journal, May 2017


Measurement of the interlamellar spacing of pearlite
journal, February 1984


Estimating Fatigue Curves With the Random Fatigue-Limit Model
journal, November 1999


Effect of laser ablation parameters on surface improvement of electron beam melted parts
journal, March 2016

  • Mohammad, Ashfaq; Mohammed, Muneer Khan; Alahmari, Abdulrahman M.
  • The International Journal of Advanced Manufacturing Technology, Vol. 87, Issue 1-4
  • DOI: 10.1007/s00170-016-8533-4

Electron beam melting of titanium alloy and surface finish improvement through rotary ultrasonic machining
journal, April 2017

  • Ahmed, Naveed; Abdo, Basem M.; Darwish, Saied
  • The International Journal of Advanced Manufacturing Technology, Vol. 92, Issue 9-12
  • DOI: 10.1007/s00170-017-0365-3

Powder bed charging during electron-beam additive manufacturing
journal, February 2017


Improving the fatigue performance of porous metallic biomaterials produced by Selective Laser Melting
journal, January 2017


Surface Finishes for Ti-6Al-4V Alloy Produced by Direct Metal Laser Sintering
journal, August 2015

  • Longhitano, Guilherme Arthur; Larosa, Maria Aparecida; Munhoz, André Luiz Jardini
  • Materials Research, Vol. 18, Issue 4
  • DOI: 10.1590/1516-1439.014415

Enhancement of Low-Cycle Fatigue Performance From Tailored Microstructures Enabled by Electron Beam Melting Additive Manufacturing Technology
journal, October 2015

  • Morton, Philip A.; Mireles, Jorge; Mendoza, Heimdall
  • Journal of Mechanical Design, Vol. 137, Issue 11
  • DOI: 10.1115/1.4031057

Site specific control of crystallographic grain orientation through electron beam additive manufacturing
journal, November 2014


Fatigue life of additively manufactured Ti–6Al–4V in the very high cycle fatigue regime
journal, January 2017


Microstructure and mechanical properties of Ti–6Al–4V manufactured by electron beam melting process
journal, December 2013


    Works referencing / citing this record:

    Fatigue Performance of Additively Manufactured Ti-6Al-4V: Surface Condition vs. Internal Defects
    journal, January 2020


    Laser Finishing of Ti6Al4V Additive Manufactured Parts by Electron Beam Melting
    journal, December 2019


    Additive Manufacturing of High-Entropy Alloys: A Review
    journal, December 2018

    • Chen, Shuying; Tong, Yang; Liaw, Peter
    • Entropy, Vol. 20, Issue 12
    • DOI: 10.3390/e20120937

    Surface Roughness Characterisation and Analysis of the Electron Beam Melting (EBM) Process
    journal, July 2019

    • Galati, Manuela; Minetola, Paolo; Rizza, Giovanni
    • Materials, Vol. 12, Issue 13
    • DOI: 10.3390/ma12132211