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论文类型：期刊论文

发表时间：2018-11-01

发表刊物：HIGH TEMPERATURE MATERIALS AND PROCESSES

收录刊物：SCIE、Scopus

卷号：37

期号：9-10

页面范围：857-862

ISSN号：0334-6455

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

摘要：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.