摘要
根据30CrMo钢的热模拟实验数据,建立了基于动态再结晶物理机制的位错密度、形核率及晶粒长大模型,并采用元胞自动机(CA)方法模拟了30CrMo钢在不同温度及应变速率下的微观组织演变规律。结果显示,通过CA方法模拟得到30CrMo钢的流变应力曲线及平均晶粒尺寸均与实验值吻合较好,所建模型的有效性和准确性得到验证。当应变速率一定时,变形温度越高越利于动态再结晶的充分进行,稳态下晶粒尺寸相对较大;而当变形温度一定时,高应变速率条件下材料的形核率较大,再结晶晶粒较细小。
The models of dislocation density,nucleation rate and grain growth based on the physical mechanism of dynamic recrystallization were established by employing the thermal simulation results of 30 CrMo steel.Aided by cellular automata(CA)approach,the microstructural evolution of 30 CrMo steel under different deformation temperatures and strain rates was investigated simulatedly.The results show that the flow stress curves and average grain sizes obtained by CA method are in good agreement with the experimental data,and the validity and accuracy of the established model are therefore verified.Besides,when the strain rate is constant,with the increase of deformation temprature,the degree of dynamic recrystallizition is more sufficient,along with the increase of grain size;when the deformation temperature is constant,high strain rate is beneficial to the nucleation of dynamic recrystallization,which leads to the refinement of grain.
作者
费荣高
赵刚
叶传龙
韩汝洋
易航
甘晓龙
Fei Ronggao;Zhao Gang;Ye Chuanlong;Han Ruyang;Yi Hang;Gan Xiaolong(College of Material Science and Metallurgical Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking,Wuhan University of Science and Technology,Wuhan 430081,China;Wuhan Branch of Baosteel Central Research Institute,Wuhan 430080,China)
出处
《武汉科技大学学报》
CAS
北大核心
2019年第6期401-408,共8页
Journal of Wuhan University of Science and Technology
基金
国家自然科学基金资助项目(51774219)
关键词
30CRMO钢
元胞自动机
动态再结晶
组织演变
应力-应变
30CrMo steel
cellular automata
dynamic recrystallization
microstructural evolution
stress-strain
