薄板坯连铸连轧65Mn钢的热轧组织与力学性能  

Microstructure and Mechanical Properties of Hot-rolled 65Mn Steel Produced by CSP

作　　者：黄刚[1] 焦国华[2] 温德智[2] 周春泉[2] 陈建新[2] 周明伟[2] 吴开明[1] 

机构地区：[1]武汉科技大学湖北省冶金工业过程系统科学重点实验室钢铁新材料与焊接技术研究所,武汉430081 [2]湖南华菱涟源钢铁有限公司,湖南娄底417009

出　　处：《材料工程》2010年第8期72-77,共6页Journal of Materials Engineering

基　　金：湖南省重大科技专项"CSP工艺生产高强度钢的研究与示范"资助项目(06GK4021);教育部新世纪优秀人才支持计划(NCET-05-0680);湖北省自然科学基金计划青年杰出人才项目(2006ABB037);湖北省教育厅国际合作项目资助(200711001)

摘　　要：利用光学显微镜,扫描电子显微镜（SEM）,透射电子显微镜（TEM）和拉伸试验机,硬度仪分析薄板坯连铸连轧工艺CSP生产的高碳高强度钢65Mn的热轧板微观组织与力学性能。该钢主要由珠光体和少量多边形铁素体组成,珠光体片层间距在0.2-0.5μm之间。该钢的平均屈服强度为489MPa,硬度为HRC22.3,伸长率达到18%;没有明显的C和Mn元素偏析,力学性能分布均匀。通过与传统连铸工艺生产的65Mn钢热轧组织与力学性能对比,CSP工艺生产的65Mn钢的组织更加细小,性能更加优良和均匀。The optical microscopy,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,tensile testing machine and hardness tester were utilized to analyze hot-rolled microstructures and mechanical properties of a high carbon steel 65Mn produced by CSP.The results showed that fine microstructures consisted of a predominantly pearlite and a lot of polygonal ferrite.The pearlite interlaminar spacing is in the range of 0.2-0.5μm.The yield strength,hardness and elongation were 489MPa,HRC22.3 and 18%,respectively.The element segregation of C and Mn produced by CSP was not obviously detected and mechanical properties were homogeneous.Compared with conventional process,the microstructure of hot-rolled 65Mn strip produced by CSP process was finer and the mechanical properties were correspondingly better.

关 键 词：CSP 珠光体 铁素体 高强度钢 

分 类 号：TG111[金属学及工艺—物理冶金] TG142[金属学及工艺—金属学]