Role of cavities on deformation-induced martensitic transformation pathways in a laser-welded, neutron irradiated austenitic stainless steel

SCRIPTA MATERIALIA

卷:178

Article

Mao, Keyou S.^1,2  Sun, Cheng²  Shiau, Ching-Heng^2,3  Yano, Kayla H.¹  Freyer, Paula D.⁴  El-Azab, Anter A.¹  Garner, Frank A.³  French, Aaron³  Shao, Lin³  Wharry, Janelle P.¹ 

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

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

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

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

关键词: Austenitic stainless steel;    Martensitic transformation;    Cavity;    Nanoindentation;    Laser weld;   

DOI  :  10.1016/j.scriptamat.2019.10.037

来源: Elsevier

【 摘 要 】

The role of cavities on deformation-induced martensitic phase transformations is studied in a laserwelded and neutron irradiated austenitic stainless steel. Orientation dependent nanoindentation experiments are performed in the base metal and the weld heat affected zone (HAZ) at room temperature. Transmission electron microscopy study of deformed microstructures indicates indentation-induced alpha'-martensite forms in the base metal, whereas alpha'- and epsilon-martensite arise in the HAZ. The different pathway of martensite phase transformation is attributed to the laser weld-induced annealing of cavities. Our results suggest that deformation-induced martensitic phase transformation of austenitic stainless steel is correlated to neutron irradiated cavity structures. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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