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Title: An ICME Approach to Determining the 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:
; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
U.S. Department of Defense (DOD) - Defense Advanced Research Projects Agency (DARPA)
OSTI Identifier:
1606248
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
JOM. Journal of the Minerals, Metals & Materials Society
Additional Journal Information:
Journal Volume: 72; Journal Issue: 1
Country of Publication:
United States
Language:
English
Subject:
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. An ICME Approach to Determining the Critical Pore Size of IN718 Produced by Selective Laser Melting. United States: N. p., 2020. Web. doi:10.1007/s11837-019-03910-0.
Sangid, Michael D., Ravi, Priya, Prithivirajan, Veerappan, Miller, Nolan A, Kenesei, Peter, & Park, Jun-Sang. An ICME Approach to Determining the Critical Pore Size of IN718 Produced by Selective Laser Melting. United States. doi:10.1007/s11837-019-03910-0.
Sangid, Michael D., Ravi, Priya, Prithivirajan, Veerappan, Miller, Nolan A, Kenesei, Peter, and Park, Jun-Sang. Wed . "An ICME Approach to Determining the Critical Pore Size of IN718 Produced by Selective Laser Melting". United States. doi:10.1007/s11837-019-03910-0.
@article{osti_1606248,
title = {An ICME Approach to Determining the 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},
journal = {JOM. Journal of the Minerals, Metals & Materials Society},
number = 1,
volume = 72,
place = {United States},
year = {2020},
month = {1}
}

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