We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Improvement of sulfide stress corrosion cracking resistance of the Inconel 625/X80 weld overlay by post-weld heat treatment.
- Authors
Dong, Lijin; Wu, Guiyu; Zhang, Yan; Shi, Zhenyan; Wang, Shidong; Wang, Qinying; Liu, Li
- Abstract
The effect of post-weld heat treatment (PWHT) on the microstructure, penetration and distribution of hydrogen, and sulfide stress corrosion cracking (SSCC) behavior was investigated to improve the cracking resistance of Inconel 625/X80 dissimilar weld overlay. Among nine candidate PWHT procedures, only the PWHT at 620 °C/20 h could improve the SSCC resistance of the overlay as no crack but only shallow pits were observed in the fusion boundary (FB) region. This PWHT procedure decreased the microhardness, increased the fraction of low-angle grain boundaries, eliminated the susceptible microstructure to hydrogen embrittlement, and therefore enhanced the SSCC resistance of the heat-affected zone. Further, in addition to the decrease of misorientation at the FB, the enhanced SSCC resistance of the FB after PWHT was mainly owing to precipitation of dispersed M23C6 carbides, which may reduce the amount of diffusible hydrogen within the martensite layer and prevent localized hydrogen concentration from reaching the cracking threshold.
- Subjects
STRESS corrosion cracking; HEAT treatment; INCONEL; CORROSION resistance; DISSIMILAR welding
- Publication
Journal of Materials Science, 2024, Vol 59, Issue 21, p9574
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-024-09731-0