904L不锈钢动态再结晶行为

采用单道次热压缩试验,研究了904L钢在不同变形温度、不同应变速率下的真应力-应变曲线以及组织形貌,阐明了热加工过程中热变形参数对其在变形过程中发生的动态再结晶行为及微观组织演变规律的影响,揭示了其相应的软化机制。结果表明:变形温度越高,流变应力越小,动态再结晶体积分数越高,晶粒尺寸越大;同温度下,变形速率越小,应力峰值越小,晶粒尺寸越大且晶界越平直化;904L钢的动态再结晶行为随着变形温度的升高,应变速率的减小,应变量的增大而进行得越充分且较高的变形温度有利于动态再结晶的进行。

Dynamic recrystallization behavior of 904L stainless steel

The true stress-stain curve and morphology at different deformation temperatures and different strain rates were studied by single pass hot compressing test. The influence of hot deformation parameters on the dynamic recrystallization behavior and microstructure evolution during deformation was clarified, and the corresponding softening mechanism was revealed. The results show that the higher the deformation temperature, the smaller the flow stress, the higher the volume fraction of dynamic recrystallization and the larger the grain size. At the same temperature, the smaller the deformation rate, the smaller the stress peak, the larger the grain size and the straighter the grain boundary. The dynamic recrystallization behavior of 904L steel increases with the increase of deformation temperature, the decrease of strain rate and the increase of strain, and the higher deformation temperature is beneficial to the dynamic recrystallization.