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Title: Test for stress relief cracking susceptibility in creep resistant chromium-molybdenum steels
An externally restrained stress relief cracking test was developed and demonstrated in testing susceptible and resistant to cracking welds in Cr–Mo steels. Compared to other externally restrained tests, it simultaneously applies stress and compensates thermal expansion during heating to post-weld heat treatment temperature and utilises digital image correlation for quantification of key characteristics of the stress relaxation and stress relief cracking phenomena. In contrast with resistant to stress relief cracking materials, susceptible materials experienced lower levels of stress relaxation, strain absorption, and sustained mechanical energy, with accelerated kinetics of strain accumulation and strain localisation leading to failure. The processes of stress relief cracking and stress relaxation were quantified as low strain – slow strain rate – low energy phenomena.  more » « less
Award ID(s):
2052747
NSF-PAR ID:
10506620
Author(s) / Creator(s):
; ; ;
Publisher / Repository:
Taylor and Francis Online
Date Published:
Journal Name:
Science and Technology of Welding and Joining
Volume:
27
Issue:
4
ISSN:
1362-1718
Page Range / eLocation ID:
265 to 281
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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