Probing the Damage Recovery Mechanism in Irradiated Stainless Steels Using In-Situ Microcantilever Bending Test

Frontiers in Materials

Cheng Sun¹  Kayla H. Yano²  Keyou S. Mao³  Philip D. Edmondson³  Janelle P. Wharry⁴  Haozheng J. Qu⁴  Hao Wang⁵ 

[1] Advanced Characterization and PIE, Idaho National Laboratory, Idaho Falls, ID, United States;Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, United States;Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States;School of Materials Engineering, Purdue University, West Lafayette, IN, United States;Western Digital Corporation, San Jose, CA, United States;

关键词: irradiation;    helium;    laser weld;    microcantilever;    crack;   

DOI  :  10.3389/fmats.2022.823192

来源: DOAJ

【 摘 要 】

Single crystalline microcantilevers are fabricated from the base metal and heat-affected zone (HAZ) of a laser welded, neutron irradiated austenitic stainless steel, for scanning electron microscope (SEM) in-situ bending. In the HAZ, cantilevers exhibit higher yield point and lower crack tip blunting displacement than in the base metal and unirradiated archive specimen. These results suggest that radiation-induced defects harden the base metal, whereas the HAZ exhibits annealing of defects leading to mechanical softening. Dislocation nucleation ahead of the crack tip is responsible for ductile blunting behavior and provides a pathway to mitigating helium-induced cracking during weld repairs of irradiated materials.

【 授权许可】

Unknown