第36卷增刊1 北京科技大学学报 Vol.36 Suppl.1 2014年4月 Journal of University of Science and Technology Beijing Apr.2014 Mn和Si对中锰热轧高强钢组织和性能的影响 赵征志12四，佟婷婷2，赵爱民12，尹鸿祥2，李双娇12，梁驹华12 1)北京科技大学治金工程研究院，北京100083 2)现代交通先进金属材料与加工技术北京实验室，北京100083 ☒通信作者，Emai:zhaozhzhi@usth.cdu.cm 摘要为了研究Mn和Si元素对中锰热轧高强钢显微组织和力学性能的影响，设计了不同Mn、Si含量CSi-Mn系试验用 钢.利用热膨胀仪、扫描电镜、透射电镜、X射线衍射和单向拉伸等实验方法对试验用钢的相变点、显微组织、残余奥氏体含量 和力学性能进行了测定与分析.结果表明：M和Si对中锰热轧高强钢的显微组织影响较大，对于低Si高M的试验钢，其显 微组织主要由粒状贝氏体组成：对于高Si高Mn的试验钢，主要由贝氏体铁素体、马氏体和残余奥氏体组成：对于高Si低M 的试验钢，则由块状铁素体、贝氏体、马氏体和残余奥氏体组成.高Si高M试验钢获得最高的综合力学性能，抗拉强度达 1200MPa以上，总伸长率为16%，强塑积接近20GPa·%.分析认为，试验钢这种高强度和较高的塑性是由超细晶组织和TRIP 效应共同决定的 关键词Mn:Si:组织性能：相变点：残余奥氏体 分类号TG156.3:TG142.1 Effect of Mn and Si on the microstructure and mechanical properties of medium manganese hot-rolled high-strength steel ZHAO Zhenghi TONG Ting-ting,ZHAO Ai-min YIN Hong xiang,U Shuang jiao LIANG Ju-hua 1)Engineering Research Institute,University of Science and Technology Beijing,Beijing 100083,China 2)Beijing Laboratory of Modern Traffic Metal Materials and Processing Technology,Beijing 100083,China Corresponding author,E-mail:zhaozhzhi@ustb.edu.cn ABSTRACT To study the effects of manganese and silicon contents on the microstructure and mechanical properties of medium manganese hot-rolled high-strength steel,different C-Si-Mn tested steels with different manganese and silicon contents were designed. The phase transformation point,microstructure,retained austenite content,and mechanical properties were measured and analyzed using dilatometric simulation,scanning electron microcopy,transmission electron microcopy,X-ray diffraction,and tensile testing. The obtained results indicate that the final microstructure of specimens can be greatly affected by the contents of manganese and silicon. The microstructure of low-silicon and high-manganese specimens consists of granular bainite.The microstructure of high-silicon and high-manganese specimens consists of bainite-ferrite,martensite,and retained austenite.The microstructure of high-silicon and low-manganese specimens consists of quasi-polygonal ferrite,bainite,martensite,and retained austenite.The results show that the best comprehensive mechanical properties of newly designed medium manganese hot-rolled high-strength steel are obtained in high Si and high Mn specimens.The ultimate tensile strength is in excess of 1200 MPa,the total elongation is 16%,and the product of tensile strength and elongation is about 20 GPa%.The high strength and ductility of the tested high-silicon and high-manganese steel can be explained by the ultrafine grain microstructure and TRIP effect. KEY WORDS manganese:silicon:microstructure and properties:phase transformation point:retained austenite 收稿日期：2013-11-12 基金项目：国家自然科学基金资助项目(51271035) DOI:10.13374/j.issn1001-053x.2014.s1.025:http://jourals.ustb.edu.cn第 36 卷 增刊 1 2014 年 4 月 北京科技大学学报 Journal of University of Science and Technology Beijing Vol． 36 Suppl． 1 Apr． 2014 Mn 和 Si 对中锰热轧高强钢组织和性能的影响 赵征志1，2) ，佟婷婷1，2) ，赵爱民1，2) ，尹鸿祥1，2) ，李双娇1，2) ，梁驹华1，2) 1) 北京科技大学冶金工程研究院，北京 100083 2) 现代交通先进金属材料与加工技术北京实验室，北京 100083  通信作者，E-mail: zhaozhzhi@ ustb． edu． cn 摘 要 为了研究 Mn 和 Si 元素对中锰热轧高强钢显微组织和力学性能的影响，设计了不同 Mn、Si 含量 C--Si--Mn 系试验用 钢． 利用热膨胀仪、扫描电镜、透射电镜、X 射线衍射和单向拉伸等实验方法对试验用钢的相变点、显微组织、残余奥氏体含量 和力学性能进行了测定与分析． 结果表明: Mn 和 Si 对中锰热轧高强钢的显微组织影响较大，对于低 Si 高 Mn 的试验钢，其显 微组织主要由粒状贝氏体组成; 对于高 Si 高 Mn 的试验钢，主要由贝氏体铁素体、马氏体和残余奥氏体组成; 对于高 Si 低 Mn 的试验钢，则由块状铁素体、贝氏体、马氏体和残余奥氏体组成． 高 Si 高 Mn 试验钢获得最高的综合力学性能，抗拉强度达 1200 MPa 以上，总伸长率为 16% ，强塑积接近 20 GPa·% ． 分析认为，试验钢这种高强度和较高的塑性是由超细晶组织和 TＲIP 效应共同决定的． 关键词 Mn; Si; 组织性能; 相变点; 残余奥氏体 分类号 TG156. 3; TG142. 1 Effect of Mn and Si on the microstructure and mechanical properties of medium manganese hot-rolled high-strength steel ZHAO Zheng-zhi 1，2)  ，TONG Ting-ting1，2) ，ZHAO Ai-min1，2) ，YIN Hong-xiang1，2) ，LI Shuang-jiao 1，2) ，LIANG Ju-hua1，2) 1) Engineering Ｒesearch Institute，University of Science and Technology Beijing，Beijing 100083，China 2) Beijing Laboratory of Modern Traffic Metal Materials and Processing Technology，Beijing 100083，China  Corresponding author，E-mail: zhaozhzhi@ ustb． edu． cn ABSTＲACT To study the effects of manganese and silicon contents on the microstructure and mechanical properties of medium manganese hot-rolled high-strength steel，different C-Si-Mn tested steels with different manganese and silicon contents were designed． The phase transformation point，microstructure，retained austenite content，and mechanical properties were measured and analyzed using dilatometric simulation，scanning electron microcopy，transmission electron microcopy，X-ray diffraction，and tensile testing． The obtained results indicate that the final microstructure of specimens can be greatly affected by the contents of manganese and silicon． The microstructure of low-silicon and high-manganese specimens consists of granular bainite． The microstructure of high-silicon and high-manganese specimens consists of bainite-ferrite，martensite，and retained austenite． The microstructure of high-silicon and low-manganese specimens consists of quasi-polygonal ferrite，bainite，martensite，and retained austenite． The results show that the best comprehensive mechanical properties of newly designed medium manganese hot-rolled high-strength steel are obtained in high Si and high Mn specimens． The ultimate tensile strength is in excess of 1200 MPa，the total elongation is 16% ，and the product of tensile strength and elongation is about 20 GPa·% ． The high strength and ductility of the tested high-silicon and high-manganese steel can be explained by the ultrafine grain microstructure and TＲIP effect． KEY WOＲDS manganese; silicon; microstructure and properties; phase transformation point; retained austenite 收稿日期: 2013--11--12 基金项目: 国家自然科学基金资助项目( 51271035) DOI: 10． 13374 /j． issn1001--053x． 2014． s1． 025; http: / /journals． ustb． edu． cn