高温下IC10合金的动态再结晶特性研究(英文)

为了研究IC10合金的动态再结晶特性,利用MTS809材料测试系统对其在900°C、不同应变率(10-4～10-2s-1)下进行了拉伸试验。试验结果表明:(1)不同应变率下的应力-应变曲线具有类似的特征,并且IC10合金的流变应力对应变率敏感;(2)流变应力、临界应力和临界应变随着应变率的增加而增大。基于TEM和SEM试验IC10合金的力学特性机理。为了描述IC10合金的动态再结晶行为,本文提出了一个新的宏观唯象本构模型。该模型的预测与试验结果比较验证了其有效性。

RECRYSTALLIZATION BEHAVIORS OF ALLOY IC10 AT ELEVATED TEMPERATURE

To investigate recrystallization behaviors of the alloy IC10, tensile experiments are conducted over a wide range of strain rates (10-4-10-2 s-1) at 900 ℃ by using a material testing system (MTS809). Experimental results show that: (1) The flow stress is sensitive to the strain rate while the stress-strain curve at various strain rates exhibit the similar features; (2) The flow stress, the critical stress and the critical strain increase with strain rates. And the mechanisms of these properties are studied based on the examinations of transmission electron microscopy(TEM) and scanning electron microscopy(SEM). In order to study the flow features of IC10, a new phenomenological constitutive model is developed. The effectiveness of the model is verified by extensive experiments on IC10.