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Title: ICME Approach to Determining Critical Pore Size of IN718 Produced by Selective Laser Melting

Journal Article · · JOM. Journal of the Minerals, Metals & Materials Society

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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); U.S. Department of Defense (DOD), Defense Advanced Research Projects Agency (DARPA)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1606248
Journal Information:
JOM. Journal of the Minerals, Metals & Materials Society, Vol. 72, Issue 1; ISSN 1047-4838
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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