ICME Approach to Determining Critical Pore Size of IN718 Produced by Selective Laser Melting
Abstract
A degree of porosity is expected in additively manufactured (AM) materials. To aid in the qualification of AM materials, the smallest pore size that results in a debit in the fatigue performance is quantified. In the work presented herein, crystal plasticity simulations are used to identify the stress concentration around pores of various sizes, revealing that a single 20-mu m pore or two 10-mu m pores (with centers spaced 15 mu m apart) localize stress at the pore, as opposed to elsewhere in the microstructure. In situ microtomography and far-field high-energy x-ray diffraction microscopy were used to identify crack formation and the evolution of the grain-level micromechanical fields during cyclic loading. Eighteen cracks were observed (15 at pores, 3 at the surface) at highly stressed grains in a sample, although most did not propagate. The dominant crack was seen to originate from the free surface, which is rationalized by fracture mechanics.
- Authors:
-
- Purdue Univ., West Lafayette, IN (United States)
- Argonne National Lab. (ANL), Lemont, IL (United States)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); U.S. Department of Defense (DOD), Defense Advanced Research Projects Agency (DARPA)
- OSTI Identifier:
- 1606248
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- JOM. Journal of the Minerals, Metals & Materials Society
- Additional Journal Information:
- Journal Volume: 72; Journal Issue: 1; Journal ID: ISSN 1047-4838
- Publisher:
- Springer
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; IN718; additive manufacturing; crack initiation; crystal plasticity; fatigue; high energy X-ray diffraction; porosity; synchrotron based microtomography
Citation Formats
Sangid, Michael D., Ravi, Priya, Prithivirajan, Veerappan, Miller, Nolan A., Kenesei, Peter, and Park, Jun-Sang. ICME Approach to Determining Critical Pore Size of IN718 Produced by Selective Laser Melting. United States: N. p., 2019.
Web. doi:10.1007/s11837-019-03910-0.
Sangid, Michael D., Ravi, Priya, Prithivirajan, Veerappan, Miller, Nolan A., Kenesei, Peter, & Park, Jun-Sang. ICME Approach to Determining Critical Pore Size of IN718 Produced by Selective Laser Melting. United States. https://doi.org/10.1007/s11837-019-03910-0
Sangid, Michael D., Ravi, Priya, Prithivirajan, Veerappan, Miller, Nolan A., Kenesei, Peter, and Park, Jun-Sang. 2019.
"ICME Approach to Determining Critical Pore Size of IN718 Produced by Selective Laser Melting". United States. https://doi.org/10.1007/s11837-019-03910-0. https://www.osti.gov/servlets/purl/1606248.
@article{osti_1606248,
title = {ICME Approach to Determining Critical Pore Size of IN718 Produced by Selective Laser Melting},
author = {Sangid, Michael D. and Ravi, Priya and Prithivirajan, Veerappan and Miller, Nolan A. and Kenesei, Peter and Park, Jun-Sang},
abstractNote = {A degree of porosity is expected in additively manufactured (AM) materials. To aid in the qualification of AM materials, the smallest pore size that results in a debit in the fatigue performance is quantified. In the work presented herein, crystal plasticity simulations are used to identify the stress concentration around pores of various sizes, revealing that a single 20-mu m pore or two 10-mu m pores (with centers spaced 15 mu m apart) localize stress at the pore, as opposed to elsewhere in the microstructure. In situ microtomography and far-field high-energy x-ray diffraction microscopy were used to identify crack formation and the evolution of the grain-level micromechanical fields during cyclic loading. Eighteen cracks were observed (15 at pores, 3 at the surface) at highly stressed grains in a sample, although most did not propagate. The dominant crack was seen to originate from the free surface, which is rationalized by fracture mechanics.},
doi = {10.1007/s11837-019-03910-0},
url = {https://www.osti.gov/biblio/1606248},
journal = {JOM. Journal of the Minerals, Metals & Materials Society},
issn = {1047-4838},
number = 1,
volume = 72,
place = {United States},
year = {Mon Nov 11 00:00:00 EST 2019},
month = {Mon Nov 11 00:00:00 EST 2019}
}
Web of Science
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