摘要
为揭示40Cr在高速冷滚打中的成形机理,依据金属材料塑性变形机理,进行了高速冷滚打条件下的40Cr击打试验,研究了40Cr在高速击打变形过程中的变形温度、变形速率、温度对流变应力的影响.基于Zener-Hollomon本构关系和试验数据,求得了40Cr在高速、大变形下的材料参数,建立了材料初始应力和峰值应力变化模型,揭示了高速冷滚打成形宏观变形与成形因素之间的联系,为揭示冷滚打成形过程的热力耦合问题提供了理论基础.
Based on the plastic deformation mechanism of metal material,a struck experiment of material property is conducted under the high-speed cold roll-beating condition,for revealing the forming mechanism in micro level and for establishing the relationship between macroscopic deformation and microscopic changes.The effect of deformation temperature,strain rate and dislocation density on rheological stress in 40Cr are studied in the process of strike deformation.The parameters of material in 40Cr are obtained according to the experimental data on the basis of a macro change model based on the Zener-Hollomon constitutive relation.Because of the evolution model of a micro structure about dislocation density,the relation between macroscopic change and microscopic change is established,which provides the theoretical support for the forming process in micro level and revels the relationship between macro deformation and micro changes in the forming process of high speed cold roll-beating.
出处
《河南理工大学学报（自然科学版）》
CAS
北大核心
2013年第5期571-575,共5页
Journal of Henan Polytechnic University（Natural Science）
基金
国家自然科学基金资助项目(51075124
50975229)
