Cr-Mo-V鍛鋼におけるクリープ損傷算出法の開発 : 第1報, クリープおよびクリープ疲労における粒界すべり成分の分離

概要

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Strain component due to grain-boundary sliding was attempted to separate from creep and creep- fatigue deformation in order to evaluate creep damage as the function of the accumulation of grain-boundary sliding. It was supposed that inelastic strain is composed of 4 components i. e.ε_<gb>,ε_<pl>,ε_<cr> andε_<dp>, where ε_<gb> is the strain due to grain-boundary sliding, ε_<pl> is plastic strain, ε_<cr> is creep strain and ε_<dp> is some inelastic strain categorized between ε_<pl> and ε_<cr>. Considering the inequality of each strain component and the inner stresses due to inharmonious values of components, the equations were devised by trial and error to simulate the creep and creep-fatigue behavior. The result of simulation with the evaluation of creep damage by ε_<gb> shows good agreement with the result of experiment in creep deformation, creep-fatigue deformation and creep rupture behavior, but the agreement with creep-fatigue failure behavior of experiment is not enough. This may suggest that creep damage is not only the function of sliding of grain-boundary but also the function of normal stress.
一般社団法人日本機械学会の論文
2001-06-25