通过硬度确定板材大变形硬化曲线的方法研究  

Determination of large strain hardening curve of metal sheet by hardness experiments

作　　者：田浩彬[1] 刘晓航[1] 苑文婧[1] 康达昌[2] 

机构地区：[1]上海第二工业大学机电学院,上海201209 [2]哈尔滨工业大学材料科学与工程学院,哈尔滨150001

出　　处：《材料科学与工艺》2012年第4期45-48,共4页Materials Science and Technology

基　　金：上海市教育委员会科研项目(06RZ016)

摘　　要：为了获得板材在大变形范围内的硬化性能,采用硬度试验与单向拉伸试验相结合的方法对材料的硬化行为进行了研究.以碳钢板为研究对象,通过测量断裂后试件不同部位的微氏硬度获得变形量与硬度之间的关系,并结合硬度与屈服应力的关系,获得了常规拉伸试验方法无法获得的大变形阶段的硬化行为.结果表明,通过该方法获得的硬化曲线变形范围广,结果可靠,能够满足塑性大变形的需要.To achieve a hardening curve with wide range strain, the hardening behavior of mild steel is re- searched by micro-hardness method and uniaxial tension test. The relationships between deformation and hard- ness can be obtained by the micro-hardness on the fractured sample, and then the hardening behaviors with wide strain can be obtained considering the relations between hardness and the yield stress. In the experi- ments, grids are made on the sample for the accurate location calculation after deformation. The results show that the hardening curve obtained by the advanced method can reflect the materials hardening properties under the large deformation.

关 键 词：硬化曲线 微氏硬度 单向拉伸试验 屈服强度 大塑性变形 

分 类 号：TG381[金属学及工艺—金属压力加工]