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Title: Effect of Hot Isostatic Pressing and Powder Feedstock on Porosity, Microstructure, and Mechanical Properties of Selective Laser Melted AlSi10Mg

Abstract

AlSi10Mg tensile bars were additively manufactured using the powder-bed selective laser melting process. Samples were subjected to stress relief annealing and hot isostatic pressing. Tensile samples built using fresh, stored, and reused powder feedstock were characterized for microstructure, porosity, and mechanical properties. Fresh powder exhibited the best mechanical properties and lowest porosity while stored and reused powder exhibited inferior mechanical properties and higher porosity. The microstructure of stress relieved samples was fine and exhibited (001) texture in the z-build direction. Microstructure for hot isostatic pressed samples was coarsened with fainter (001) texture. To investigate surface and interior defects, scanning electron microscopy, optical fractography, and laser scanning microscopy techniques were employed. Hot isostatic pressing eliminated internal pores and reduced the size of surface porosity associated with the selective laser melting process. Hot isostatic pressing tended to increase ductility at the expense of decreasing strength. Furthermore, scatter in ductility of hot isostatic pressed parts suggests that the presence of unclosed surface porosity facilitated fracture with crack propagation inward from the surface of the part.

Authors:
 [1];  [1];  [1];  [1]
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  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1444079
Report Number(s):
SAND-2018-5832J
Journal ID: ISSN 2192-9262; 663667
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Metallography, Microstructure and Analysis
Additional Journal Information:
Journal Volume: 7; Journal Issue: 4; Journal ID: ISSN 2192-9262
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; aluminum alloys; additive manufacturing; fractography; mechanical behavior; microstructure

Citation Formats

Finfrock, Christopher B., Exil, Andrea, Carroll, Jay D., and Deibler, Lisa Anne. Effect of Hot Isostatic Pressing and Powder Feedstock on Porosity, Microstructure, and Mechanical Properties of Selective Laser Melted AlSi10Mg. United States: N. p., 2018. Web. doi:10.1007/s13632-018-0456-z.
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Finfrock, Christopher B., Exil, Andrea, Carroll, Jay D., & Deibler, Lisa Anne. Effect of Hot Isostatic Pressing and Powder Feedstock on Porosity, Microstructure, and Mechanical Properties of Selective Laser Melted AlSi10Mg. United States. doi:10.1007/s13632-018-0456-z.
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Finfrock, Christopher B., Exil, Andrea, Carroll, Jay D., and Deibler, Lisa Anne. Wed . "Effect of Hot Isostatic Pressing and Powder Feedstock on Porosity, Microstructure, and Mechanical Properties of Selective Laser Melted AlSi10Mg". United States. doi:10.1007/s13632-018-0456-z. https://www.osti.gov/servlets/purl/1444079.
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@article{osti_1444079,
title = {Effect of Hot Isostatic Pressing and Powder Feedstock on Porosity, Microstructure, and Mechanical Properties of Selective Laser Melted AlSi10Mg},
author = {Finfrock, Christopher B. and Exil, Andrea and Carroll, Jay D. and Deibler, Lisa Anne},
abstractNote = {AlSi10Mg tensile bars were additively manufactured using the powder-bed selective laser melting process. Samples were subjected to stress relief annealing and hot isostatic pressing. Tensile samples built using fresh, stored, and reused powder feedstock were characterized for microstructure, porosity, and mechanical properties. Fresh powder exhibited the best mechanical properties and lowest porosity while stored and reused powder exhibited inferior mechanical properties and higher porosity. The microstructure of stress relieved samples was fine and exhibited (001) texture in the z-build direction. Microstructure for hot isostatic pressed samples was coarsened with fainter (001) texture. To investigate surface and interior defects, scanning electron microscopy, optical fractography, and laser scanning microscopy techniques were employed. Hot isostatic pressing eliminated internal pores and reduced the size of surface porosity associated with the selective laser melting process. Hot isostatic pressing tended to increase ductility at the expense of decreasing strength. Furthermore, scatter in ductility of hot isostatic pressed parts suggests that the presence of unclosed surface porosity facilitated fracture with crack propagation inward from the surface of the part.},
doi = {10.1007/s13632-018-0456-z},
journal = {Metallography, Microstructure and Analysis},
number = 4,
volume = 7,
place = {United States},
year = {2018},
month = {6}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI:  10.1007/s13632-018-0456-z
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Figures / Tables:

Fig. 1 Fig. 1: (a) 1.5 x 2.5 mm dogbone tension specimen used to determine mechanical performance. (b) Additional 6.5 x 6.5 mm dogbone tension specimen used for metallographic characterization
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Works referenced in this record:

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journal, September 2017

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journal, October 2014

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    Works referencing / citing this record:

    Evolution of damage and failure in an additively manufactured 316L SS structure: experimental reinvestigation of the third Sandia fracture challenge
    journal, March 2019

    • Kramer, S. L. B.; Ivanoff, T. A.; Madison, J. D.
    • International Journal of Fracture, Vol. 218, Issue 1-2
    • DOI: 10.1007/s10704-019-00357-x
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      Figures / Tables found in this record:

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