脉冲电流作用下40Cr钢淬火残余应力的消除  

Residual stress release in quenched 40Cr steel under electropulsing

作　　者：王景鹏[1] 贺笑春[1] 王宝全[1] 郭敬东[1] 

机构地区：[1]中国科学院金属研究所沈阳材料科学国家(联合)实验室,沈阳110016

出　　处：《材料研究学报》2007年第1期41-44,共4页Chinese Journal of Materials Research

基　　金：国家自然科学基金50371091;90206044资助项目;辽宁省自然科学基金20062008资助项目.

摘　　要：研究了脉冲电流作用下40Cr钢淬火残余应力的消除．结果表明,当脉冲电流密度达到一定数值后,材料中的残余应力开始部分弛豫;当电流密度达到6．3 kA/mm^2时,残余应力可在700μs的脉冲电流处理时间内完全消除,而试样的瞬时温升仅约为360℃．在脉冲电流作用下残余应力弛豫的主要原因,可能是电流的电致塑性效应降低了材料的屈服强度,试样在由快速加热产生的瞬时热压应力和残余应力的共同作用下发生了微量的塑性变形．High current density electropulsing was used to release quenched residual stress in 40Cr steel. It was found that residual stress began to release when the current density was higher than a certain value. And when the current density was up to 6.3 kA/mm^2, the residual stress could be completely released in 700 μs at a temperature rise of about 360 ℃. The main reason for the stress release was proposed to be that the yield stress of the material decreased due to the electroplastic effect of current, and at the same time, there was a thermal compressive stress induced by the high-rate heating process of electropulsing. The thermal compressive stress and the residual stress might caused plastic deformation of the sample and therefore realized residual stress release.

关 键 词：金属材料 脉冲电流 淬火残余应力 40CR钢 

分 类 号：TG113[金属学及工艺—物理冶金]