Damage evolution and failure mechanisms in additively manufactured stainless steel

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:651

Article

Carlton, Holly D.¹  Haboub, Abdel³  Gallegos, Gilbert F.¹  Parkinson, Dilworth Y.²  MacDowell, Alastair A.² 

[1] Lawrence Livermore Natl Lab, Mat Engn Div, Livermore, CA 94550 USA

[2] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[3] Lincoln Univ, Life & Phys Sci Dept, Jefferson City, MO 65101 USA

关键词: Additive manufacturing;    Selective laser melting;    Stainless steel;    Porosity distribution;    Synchrotron Radiation micro-Tomography;   

DOI  :  10.1016/j.msea.2015.10.073

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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