Damage evolution and failure mechanisms in additively manufactured stainless steel

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• 作者：Holly D. Carlton^a ; ^{carlton4@llnl.gov" class="auth_mail" title="E-mail the corresponding author} ; Abdel Haboub^c ; Gilbert F. Gallegos^a ; Dilworth Y. Parkinson^b ; Alastair A. MacDowell^b
• 关键词：Additive manufacturing ; Selective laser melting ; Stainless steel ; Porosity distribution ; Synchrotron Radiation micro-Tomography
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：10 January 2016
• 年：2016
• 卷：651
• 期：Complete
• 页码：406-414
• 全文大小：7896 K

文摘

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.