Effect of strain rate on mechanical behaviors of Ti10V2Fe3Al and 30CrMnSiNi2A

来源期刊：中国有色金属学报(英文版)2000年第1期

论文作者：唐长国 朱金华 魏寿庸

文章页码：76 - 79

Key words：dynamic tension tests; strength; plasticity; strain-hardening

Abstract: Dynamic tension tests were employed to investigate the effect of strain rate on mechanical behaviors of Ti10V2Fe3Al and 30CrMnSiNi2A. The strain rate ranges from 10^-4 to 10³s^-1. Experimental results showed that the yield strength (σ_s), ultimate strength(σ_u) and elongation(δ₅) increase, but strain hardening exponent(n) decreases with the rise of strain rate(^.ε) by refractive lines. The reasons thatσsand σ uincrease with increasing ^.εare concerned with thermal activation. The high strain rate induced increasing plasticity is associated with adiabatic heating of specimen, impact twinning and suppression of strain-induced-phase transformation. Strain hardening exponentncan be considered a con- stant under quasi-static loading, but decreases rapidly till an ideal plastic state(n=0) after strain rate surpassing a critical value(10²s^-1). The mechanism ofndecreasing with the increase of.εis related to the increase of σsand suppression of strain-induced-phase transformation.