金属材料の弾粘塑性特性と動的時効に及ぼす予加工・変形速度・温度の影響

-35℃から150℃の温度領域でのSUS316Lステンレス鋼に対する検討

抄録

It is considered that the rate dependence of the flow stress of metal materials is caused by both viscoplasticity and dynamic aging. In this study, influence of temperature on viscosity and dynamic aging which dominate plastic deformation behavior of SUS316L/316 stainless steels after cyclic preloading is investigated experimentally, and is analyzed theoretically based on the proposed elasto-viscoplastic constitutive model with effect of dynamic strain aging. It is found that, at about -35°C to 150°C, viscosity shows very small change even after cyclic loading. On the other hand, aging shows great increase due to cyclic loading and both viscosity and aging decrease with an increase in temperature for SUS316. Aging is very small and increases slightly with increasing of temperature for SUS316L. The proposed elasto-viscoplastic constitutive model used in this paper is confirmed to give systematic predictions of rate dependent stress-strain relations of both SUS316L and SUS316S.S. at the temperature of about -35 to 150°C.