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Indexed by:期刊论文

Date of Publication:2018-11-01

Journal:HIGH TEMPERATURE MATERIALS AND PROCESSES

Included Journals:SCIE、Scopus

Volume:37

Issue:9-10

Page Number:857-862

ISSN No.:0334-6455

Key Words:SA302Gr.C low alloy steel; stress relaxation experiment; creep constitutive equations; FE simulation

Abstract:In order to study the stress relaxation behaviour of SA302Gr.C low-alloy steel, the stress relaxation experiments were performed at the temperatures of 400,500 and 620 degrees C with the constant strain of 0.5%. Based on the experimental stress relaxation curves, the relationship between creep strain rate and stress were derived and the creep strain rate-stress curves at different temperatures were obtained. Then, the creep constitutive equations at different conditions were developed and the constants in the equations were determined. In order to verify the developed creep constitutive equations, the finite-element (FE) model of stress relaxation of SA302Gr.C low-alloy steel was established with the FE software MSC.Marc. The comparison results show that the simulated stress relaxation curves agree with the experimental ones, which illustrates that the developed creep constitutive equations are appropriate for the tested steel.