Title of Paper:The Application of Stress-Relaxation Test to Life Assessment of T911/T22 Weld Metal

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Date of Publication:2016-03-01

Journal:JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE

Included Journals:SCIE、EI

Volume:25

Issue:3

Page Number:1103-1108

ISSN No.:1059-9495

Key Words:creep; life assessment; stress-relaxation; weld metal

Abstract:A dissimilar weld metal was obtained through submerged arc welding of a T911 steel to a T22 steel, and its creep property was explored by stress-relaxation test assisted by some conventional creep tests. The creep rate information of the stress-relaxation test was compared to the minimum and the average creep rates of the conventional creep test. Log-log graph showed that the creep rate of the stress-relaxation test was in a linear relationship with the minimum creep rate of the conventional creep test. Thus, the creep rate of stress-relaxation test could be used in the Monkman-Grant relation to calculate the rupture life. The creep rate of the stress-relaxation test was similar to the average creep rate, and thereby the rupture life could be evaluated by a method of "time to rupture strain." The results also showed that rupture life which was assessed by the Monkman-Grant relation was more accurate than that obtained through the method of "time to rupture strain.".