帘线钢微合金化组织与性能研究  

Study on microstructure and property of tire cord steel micro-alloying

作　　者：王洪利[1] 刘宏玉[1,2] 王瑞敏[1] 周鹏[1] 黄彧[1] 

机构地区：[1]武汉科技大学,湖北武汉430065 [2]冶金工业过程系统科学湖北省重点实验室,湖北武汉430065

出　　处：《金属制品》2011年第4期62-65,69,共5页Metal Products

基　　金：冶金工业过程系统科学湖北省重点实验室(武汉科技大学)开放基金;编号C201017

摘　　要：为提高帘线钢强度,减轻晶界渗碳体析出,研究Cr微合金化80级帘线钢显微组织与性能的变化规律。用光学显微镜和扫描电镜观测热加工后不同Cr含量试样的索氏体化率、珠光体团尺寸、珠光体片间距、渗碳体析出状况;用力学试验机测量含Cr钢丝冷拉前后的力学性能。结果表明:Cr微合金化能减小珠光体团尺寸和珠光体片间距,提高索氏体化率,降低渗碳体连续性,提高钢丝抗拉强度。当w(Cr)为0.386%时,热加工后钢丝性能最佳,此时抗拉强度由未合金化时的889 MPa提高到1 030 MPa,断面收缩率由未合金化时的42%提高到44%,而且冷拉后的加工硬化率也最大。To increase the tire cord steel strength and alleviate the precipitation of grain boundary cementite （ GBC）, Cr micro-alloying 80 grade tire cord steel microstructures and properties change is studied. Sorbite volume fraction, size of pearlite colony, interlamellar spacing of pearlite and GBC precipitation in specimens with various Cr contents after hot working were observed by the optical microscope and the scanning electron microscope. Results show that the Cr micro-alloying can decrease the size of pearlite colony and the interlamellar spacing of pearlite, raise the volume fraction of sorbite, decrease the continuity of GBC and increase the tensile strength of steel wire. When the mass fraction of Cr is 0. 386%, the comprehensive properties of steel wire after hot working are optimal, the tensile strength is increased from unalloyed 889 MPa to 1 030 MPa, area reduction is increased from unalloyed 42% to 44% , and the work hardening rate after cold drawing is the highest.

关 键 词：帘线钢 微合金化 显微组织 力学性能 扫描电镜 

分 类 号：TG356.55[金属学及工艺—金属压力加工]