1Cr-Mo-V鋼および2.25Cr-1Mo鋼の長時間応力リラクセーションにおける残留応力の予測

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The authors have been systematically studying stress relaxation properties for typical heat resiating materials which are used in high temperature plants.In this study,the infiuences of test temperature and total strain on the long-term stress relaxation behavior for a 1Cr-Mo-V turbine rotor steel and a 2.25Cr1Mo pressure vessel steel and the relationship between stress relaxation properties and creep properties were investigated,and a simple prediction method of residual stress was proposed.The residual stress at shorter times in relaxation curess relaxation curves for 1Cr-Mo-V steel showed the same deoendence on temperature as that at longer times.The dependence of residual stress on temoerature for 2.25Cr-1Mo steel was fairy small at longer times. The influence of total strain on residual stress for 1Cr-Mo-V and 2.25Cr-1Mo steels was found that the relaxed stress ratio at a specifind time in stress relaxation tests was related with the rupture time in creep test at the same atress as the initial stress in the stress relaxation test,and the relationship berween the relaxed stress ratio and the rupture time was rupture time was nearly independent of test temperature, total strain and materials.A simple prediction method of residual stress in stress relaxation tests was proposed on the basis of the diagram of relaxed stress ratio versus rupture time obtained.The predicted residual stress from the proposed method agreed well with the observed one.
社団法人日本材料学会の論文
1990-07-15

1Cr-Mo-V鋼および2.25Cr-1Mo鋼の長時間応力リラクセーションにおける残留応力の予測

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