Creep behavior of 316 L stainless steel manufactured by laser powder b e d fusion

JOURNAL OF NUCLEAR MATERIALS

卷:548

Article

Li, Meimei¹  Zhang, Xuan¹  Chen, Wei-Ying¹  Byun, T. S.² 

[1] Argonne Natl Lab, 9700 South Cass Ave, Argonne, IL 60439 USA

[2] Oak Ridge Natl Lab, 1 Bethel Valley Rd, Oak Ridge, TN 37831 USA

关键词: 316 L stainless steel;    Additive manufacturing;    Creep;    Dislocation substructure;    Porosity;   

DOI  :  10.1016/j.jnucmat.2021.152847

来源: Elsevier

【 摘 要 】

Additive manufacturing as a new processing technique can produce unique microstructure that is difficult to achieve using conventional techniques. In this study, we have investigated the creep behavior of 316 L stainless steel produced by a laser powder bed fusion process at temperatures of 550, 600 and 650 degrees C and stresses between 175 and 300 MPa. We found that additively-manufactured 316 L stainless steel had a higher stress dependence of the minimum creep rate than conventionally-made Type 316 SS, which could be attributed to the dislocation cell structure resulting from the printing process. The dislocation cell structure was unstable under creep, evolving into a uniform dislocation structure under the test conditions. While internal porosity in AM 316 L SS may serve as nucleation sites of creep voids and may be responsible for a relatively lower creep life, additively-manufactured 316 SS did not show inferior creep ductility when compared with conventionally-made 316 SS. The creep life of AM 316 L SS could be improved by stabilizing dislocation cell structure and/or reducing internal porosity through an optimized additive manufacturing process. (c) 2021 Elsevier B.V. All rights reserved.

【 授权许可】

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