Stress Corrosion Cracking Susceptibility of 304L Substrate and 308L Weld Metal Exposed to a Salt Spray
Chia-Hao Hsu 
1
Institute of Materials Engineering, National Taiwan Ocean University, Keelung 20224, Taiwan
2
Division of Nuclear Fuels and Materials, Institute of Nuclear Energy Research, Lungtan, Taoyuan 32546, Taiwan
*
Author to whom correspondence should be addressed.
Materials 2017, 10(2), 187; https://doi.org/10.3390/ma10020187
Received: 9 November 2016 / Accepted: 9 February 2017 / Published: 15 February 2017
(This article belongs to the Special Issue Stress Corrosion Cracking in Materials)
304 stainless steels (SS) were considered as the materials for a dry storage canister. In this study, ER (Electrode Rod) 308L was utilized as the filler metal for the groove and overlay welds of a 304L stainless steel substrate, which was prepared via a gas tungsten arc-welding process in multiple passes. The electron backscatter diffraction (EBSD) map was used to identify the inherent microstructures in distinct specimens. U-bend and weight-loss tests were conducted by testing the 304L substrates and welds in a salt spray containing 5 wt % NaCl at 80 °C to evaluate their susceptibility to stress corrosion cracking (SCC). Generally, the weight loss of the ER 308L deposit was higher than that of the 304L substrate in a salt spray in the same sample-prepared condition. The dissolution of the skeletal structure in the fusion zone (FZ) was responsible for a greater weight loss of the 308L deposit, especially for the cold-rolled and sensitized specimen. Cold rolling was detrimental and sensitization after cold rolling was very harmful to the SCC resistance of the 304L substrate and 308L deposit. Overall, the SCC susceptibility of each specimen was correlated with its weight loss in each group.
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Keywords:
308L deposit; 304L substrate; U-bend; weight loss; stress corrosion cracking
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MDPI and ACS Style
Hsu, C.-H.; Chen, T.-C.; Huang, R.-T.; Tsay, L.-W. Stress Corrosion Cracking Susceptibility of 304L Substrate and 308L Weld Metal Exposed to a Salt Spray. Materials 2017, 10, 187.
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