期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.10.073
关键词
Additive manufacturing; Selective laser melting; Stainless steel; Porosity distribution; Synchrotron Radiation micro-Tomography
类别
资金
- LLNL's Accelerated Certification of Additively Manufactured Metals (ACAMM)
- U.S. Department of Energy by Lawrence Livermore National Laboratory, Office of Science [DE-AC52-07NA27344]
- Laboratory Directed Research and Development Program at LLNL [13-SI-002]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
In situ tensile tests were performed on additively manufactured austenitic stainless steel to track damage evolution within the material. For these experiments Synchrotron Radiation micro-Tomography was used to measure three-dimensional pore volume, distribution, and morphology in stainless steel at the micrometer length-scale while tensile loading was applied. The results showed that porosity distribution played a larger role in affecting the fracture mechanisms than measured bulk density. Specifically, additively manufactured stainless steel specimens with large inhomogeneous void distributions displayed a flaw-dominated failure where cracks were shown to initiate at pre-existing voids, while annealed additively manufactured stainless steel specimens, which contained low porosity and randomly distributed pores, displayed fracture mechanisms that closely resembled wrought metal. (C) 2015 Elsevier B.V. All rights reserved.
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