压痕应变法在钢板板形缺陷诊断中的应用  

Surface Residual Strain Measurement for Shape Defect Diagnosis of Steel by Indentation-strain Method

作　　者：余立[1] 刘冬[1] 陈明[1] 彭文杰[1] 曾雄镖 

机构地区：[1]武钢研究院,湖北武汉430080 [2]神龙汽车有限公司,湖北武汉430056

出　　处：《武汉工程职业技术学院学报》2017年第2期8-12,共5页Journal of Wuhan Engineering Institute

摘　　要：应用压痕应变法对改进前后两次轧制工艺条件下未矫、初矫、复矫的车桥用钢残余应力分布情况进行了研究,结果表明:钢板表面残余应力的大小和分布与板形缺陷存在直接联系,当表面残余应力绝对值或者正反面残余应力的差值较大时,钢板容易在加工过程中出现瓢曲等板形缺陷。通过分析研究,B工艺在A工艺基础上对冷却参数进行了有针对性的调整后,B工艺生产的钢板表面残余应力大小和分布有了极大的改善,同时应用这一技术,对两种工艺条件下的矫直工艺进行了评价,并指导矫直工艺进行有针对性的优化。In this paper, indentation strain-gage method was used to study the distribution of surface residual stress of axle steel in A and B cooling process which was then straightened by non-, single- and second straightening process respectively. It showed that the flatness defect of axle steel after cutting was closely related to the value and distribution of the surface residual stress. The steel was prone to buckling or other plate-shaped defects when the absolute value of the surface residual stress or the difference be-tween positive and negative was larger than normal. The distribution of surface residual stress on the board which was produced by process B adjusted based on process A has been greatly improved. This also ex-plains that the determination of residual stress by indentation strain-gage method can help to predict the deformation of the steel, and with the application of the technology, it will effectively guide the process of rolling and straightening.

关 键 词：压痕应变法 残余应力 板形诊断 板形缺陷 

分 类 号：TG157[金属学及工艺—热处理]