Effect of laser welding on deformation mechanisms in irradiated austenitic stainless steel

JOURNAL OF NUCLEAR MATERIALS

卷:528

Article

Mao, Keyou S.^1,2,3  Sun, Cheng³  Liu, Xiang³  Qu, Haozheng J.²  French, Aaron J.⁴  Freyer, Paula D.⁵  Garner, Frank A.⁴  Shao, Lin⁴  Wharry, Janelle P.² 

[1] Oak Ridge Natl Lab, Mat Sci & Technol Div, POB 2009, Oak Ridge, TN 37831 USA

[2] Purdue Univ, Coll Engn, 701 West Stadium Ave, W Lafayette, IN 47907 USA

[3] Idaho Natl Lab, Characterizat & Adv PIE Div, Idaho Falls, ID 83415 USA

[4] Texas A&M Univ, Dept Nucl Engn, College Stn, TX 77843 USA

[5] Westinghouse Elect Co LLC, Global Technol Dev, Pittsburgh, PA 15235 USA

关键词: Irradiation;    Deformation mechanism;    Austenitic stainless steel;    In-situ microcompression tests;    Void;   

DOI  :  10.1016/j.jnucmat.2019.151878

来源: Elsevier

【 摘 要 】

Deformation mechanism of a laser weld on neutron irradiated AISI 304L stainless steel was studied by in-situ microcompression test at room temperature. The deformation-induced austenite-to-martensite phase transformation occurs in {101}-oriented grains in the irradiated base metal, while deformation twinning prevails in {101}-oriented grains in the weld heat affected zone (HAZ). A high number density of irradiation-induced voids in the base metal provide sufficient nucleation sites for the austenite-to-martensite phase transformation under compression at room temperature. A deformation map is established to predict critical twinning stress for face-centered cubic (fcc) metals and alloys. Our study suggests that irradiation can tailor the deformation-induced phase transformation in austenitic stainless steels. (C) 2019 Elsevier B.V. All rights reserved.

【 授权许可】

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