低碳钢奥氏体再结晶模型的建立  

Construction of the recrystallization model of low carbon steel during deformation

作　　者：沈丙振[1] 方能炜[1] 沈厚发[1] 柳百成[1] 

机构地区：[1]清华大学机械工程系,北京100084

出　　处：《材料科学与工艺》2005年第5期516-520,共5页Materials Science and Technology

基　　金：国家自然科学基金资助项目(50275014);辽宁省自然科学基金资助项目(20022017)

摘　　要：为了描述低碳钢变形过程的组织演化,建立了一套完整的奥氏体动态再结晶、静态再结晶、亚动态再结晶模型.本文利用G leeb le试验机研究不同初始晶粒度、变形温度、应变和应变速率对奥氏体再结晶量和晶粒尺寸变化的影响.流变应力模型考虑了变形条件对模型系数的影响.利用测得的应力-应变曲线及晶粒度由多元非线性回归得出了奥氏体再结晶模型系数,并且由模型计算的峰值应变、稳定应变、硬化区流变应力、再结晶体积分数、晶粒尺寸和实际接近.In order to simulate the microstructure evolution of low carbon steel in rough rolling process, a set of models of the dynamic recrystallization, static recrystallization and metadynamic recrystallization has been constructed based on regression of experimental data. The effects of initial grain size, deforming temperature, strain and strain- rate on austenitic recrystallized volume fraction and grain size were studied using a Gleeble machine. The deforming conditions were taken into account in the flow stress model. Based on the measured stress - strain curve and grain size, the coefficients of models were determined with multiple non - linear regressions. The calculated results by the models show that the peak strain, steady state strain, flow stress, recrystallization volume fraction and grain size are consistent with the measured values in the deformation conditions.

关 键 词：低碳钢 动态再结晶 静态再结晶 亚动态再结晶 

分 类 号：TG335.11[金属学及工艺—金属压力加工]