2・1/4Cr-1Mo鋼の高温変形における有効応力の進展

概要

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In this study, the progression of the overstress and the internal stress during an inelastic deformation of 2・・1/4 Cr-1 Mo Steel at 550℃℃, is investigated. An abrupt unloading was imposed during a fully reversed push-pull loading on the tension-going stroke at various strain levels. The rate of strain in the push-pull loading ranged from 10^<-3> to 10^<-5>/s whereas that of unloading was at 10^<-3> 1/s. It was observed that the overstress increased rapidly at the start of the tension going stroke and reached a steady-state value soon thereafter. The overstress appeared to be independent of the strain rate. On the other hand, the back stress increased rapidly in the early stage of loading, and continued to increase further albeit at a lower rate of increase. The drag stress in the meantime remained constant. The internal stress thus exhibited a rate-dependency. It is concluded that the overstress controls the rate-independent component of the inelastic strain while the internal stress controls the time-dependent part.
社団法人日本機械学会の論文
1989-11-25