Cr-Mo-V鍛鋼におけるクリープ損傷算出法の開発 : 第2報,クリープおよびクリープ疲労における粒界損傷評価

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In the previous report, creep damage evaluation method was studied for creep and creep-fatigue situations of Cr-Mo-V rotor steel and the stress-strain equations were devised by trial and error to simulate the creep and creep-fatigue behavior. However, to simulate the experimentally obtained behavior of the grain-boundary cavity, further improvement must be applied to the equations. In this report, it is assumed that grain-boundary sliding is not only caused by creep strain but the effect of plastic strain must be considered, and inelastic strain is composed of 5 components i.e. ε_bpl, ε_bcr, ε_pl, ε_cr, and ε_dp, where ε_bpl and ε_bcr are the strains due to grain-boundary sliding, ε_pl, ε_cr and ε_dp are the strains due to the deformation of grains. Considering the inequality of each strain component and the inner stresses due to inharmonious values of components, new improved stress-strain equations were devised. The result of simulation shows good agreement with the result of experiment in creep deformation, creep-fatigue deformation, creep rupture behavior and cavity behavior on the grain-boundary,but the agreement with the number of cycles to failure and stress relaxation behavior in the strain-cycling tests with hold time is not enough. This may suggest that the decrease of the number of cycles to failure is caused by inelastic strain with surface oxidation etc. during the hold time rather than the accumulation of grain-boundary sliding.
一般社団法人日本機械学会の論文
2002-06-25

Cr-Mo-V鍛鋼におけるクリープ損傷算出法の開発 : 第2報,クリープおよびクリープ疲労における粒界損傷評価

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