OS0506 オーステナイト系ステンレス鋼の繰り返し硬化特性回復に対する物理メカニズムの解明

Abstract

For prediction of thermal ratchet deformation on FBR pressure vessels, the inelastic constitutive model is required to simulate both cyclic hardening and its recovery during high temperature operation. In this paper, macro model is examined to simulate the recovery of cyclic hardening, which will be linked with the micro model based on the hypothesis that dislocation structures are dissolved with holding period increasing under high temperature. The structural analysis with the macro model demonstrates that the recovery induces the progress of axial and radial plastic strain. It indicates the necessity to simulate the recovery of cyclic hardness in inelastic constitutive models.