304奥氏体不锈钢冷拉拔过程中的微观组织不均匀性  

Microstructure inhomogeneous of 304 austenitic stainless steel during cold drawing

作　　者：杨春雷 徐红 曾庆辉 栾佰峰[1] 李明杨 李超群 严磊 刘礼华 刘庆[1] YANG Chun-lei;XU Hong;ZENG Qing-hui;LUAN Bai-feng;LI Ming-yang;LI Chao-qun;YAN Lei;LIU Li-hua;LIU Qing(College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;Fasten Hopesun Group Co.,Ltd.,Jiangyin 214434,China;College of Intelligent Manufacturing Engineering,Chongqing University of Arts and Sciences,Chongqing 402160,China;Jiangyin Fasten Hopesun Stainless Steel Products Co.,Ltd.,Jiangyin 214400,China)

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]法尔胜泓昇集团有限公司,江苏江阴214434 [3]重庆文理学院智能制造工程学院,重庆402160 [4]江阴法尔胜泓昇不锈钢制品有限公司,江苏江阴214400

出　　处：《材料热处理学报》2019年第11期159-165,共7页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金创新群体项目(51421001);江苏省科技成果转化专项资金项目(BA2018047)

摘　　要：利用硬度测试、电子背散射衍射(EBSD)、能谱仪(EDS)、透射菊池衍射(TKD)和透射电镜(TEM)等对304奥氏体不锈钢冷拉拔过程中的微观组织进行研究。结果表明:304奥氏体不锈钢原始盘条中存在少量α′马氏体,且中心区域的马氏体体积分数高于表面区域。在拉拔过程中,钢丝的硬度沿钢丝表面至中心呈增加的趋势,这主要是由马氏体在钢丝半径方向上的不均匀分布造成的,即沿钢丝半径方向不同的轴向应变导致了边部至中心区域不同的织构及马氏体体积分数。另外,在冷拉拔过程中未发现明显的元素偏析现象。Microstructure of 304 austenitic stainless steel during cold drawing were investigated by means of hardness test, electron backscattering diffraction(EBSD) technique, energy dispersive spectrometer(EDS), transmission kikuchi diffraction(TKD) and transmission electron microscopy(TEM). The results show that there is a small amount of α′ martensite in the original wire rod of 304 austenitic stainless steel, and the volume fraction of α′ martensite in the central region is higher than that in the surface region. In the process of drawing, the hardness of the steel wire increases along the surface of steel wire to the center, which is mainly caused by the inhomogeneous distribution of martensite in the direction of steel wire radius, that is to say, the different axial strain along the direction of the steel wire radius leads to different texture and volume fraction from edge to center. In addition, no obvious segregation of elements of the steel wire is found in the process of cold drawing.

关 键 词：304奥氏体不锈钢 冷拉拔 形变马氏体 

分 类 号：TG142.7[一般工业技术—材料科学与工程]