工程科学学报，第38卷，第2期：223-229,2016年2月 Chinese Journal of Engineering,Vol.38,No.2:223-229,February 2016 DOI:10.13374/j.issn2095-9389.2016.02.010:http://journals.ustb.edu.cn 预处理组织对低碳钢IQ&P工艺下组织及性能影响 陈连生”，张健杨”，田亚强四，宋进英”，徐勇2，张士宏 1)河北联合大学治金与能源学院，唐山0630092)中国科学院金属研究所，沈阳110016 ☒通信作者，E-mail:tyqwylf6ve@163.com 摘要采用y单相区和y+双相区轧制并淬火工艺以及双相区再加热一淬火一碳配分(IQ心P)工艺，研究预处理组织对低 碳钢室温状态多相组织特征及力学性能的影响规律.实验用低碳钢经两种工艺轧制并淬火处理，获得马氏体和马氏体+铁 素体的预处理组织，再经双相区Q&P工艺处理后均获得多相组织.马氏体预处理钢的室温组织由板条状亚温铁素体、块状 回火马氏体以及一定比例的针状未回火马氏体和8.2%的针状残余奥氏体组成：马氏体+铁素体预处理钢由板条状亚温铁素 体、块状和针状未回火马氏体以及14.3%的短针状或块状残余奥氏体组成.在相同的双相区IQ&P工艺参数下，预处理组织 为马氏体的钢抗拉强度为770MPa,伸长率为28%，其强塑积为21560MPa·%:而预处理组织为马氏体+铁素体的钢抗拉强度 为834MPa,伸长率增大到36.2%，强塑积达到30190MPa%,获得强度与塑性的优良结合. 关键词低碳钢：多相钢：预处理组织：形态：力学性能 分类号TG142.2 Effect of pretreated microstructure on the morphology and mechanical properties of low-carbon steel with 10&P treatment CHEN Lian-sheng",ZHANG Jian-yang,TIAN Ya-qiang,SONG Jin-ying,XU Yong,ZHANG Shi-hong? 1)School of Metallurgy and Energy Engineering,Hebei United University,Tangshan 063009,China 2)Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China Corresponding author,E-mail:tyqwylfive@163.com ABSTRACT The effects of pretreated microstructure on the multiphase microstructure features at room temperature and the mechani- cal properties of low-earbon steel were studied by the treatment of water cooling after hot-rolling in the y phase region or in the y+ phase region followed by the treatment of intereritical reheating-quenching-partitioning (IQ&P).Two different pretreated microstruc- tures,which are martensite and martensite ferrite,are obtained by the two different hot-rolling and quenching processes.After Q&P,the steel with martensite as pretreated microstructure,in which the volume fraction of retained austenite is 8.2%,is turned into a multi-phase structure composed of lath intercritical ferrite,block tempered martensite,needle-like untempered martensite,and retained austenite.While the steel with martensite ferrite as pretreated microstructure,in which the volume fraction of retained austenite is 14.3%,is turned into a multi-phase structure composed of lath intercritical ferrite,block or needle-ike untempered martensite,and short needle-like or block retained austenite.With the same IQ&P process parameters,the tensile strength of the steel with martensite as pretreated microstructure is 770 MPa,the elongation is 28%,and the product of strength and elongation is 21560 MPa%.While the tensile strength of the steel with martensite +ferrite as pretreated microstructure is 834 MPa,the elongation increases to 36.2%,and the product of strength and elongation reaches to 30190 MPa%.In other words,the steel has obtained a good combination of strength and ductility. 收稿日期：2014-11-26 基金项目：国家自然科学基金项目资助项目(51254004,51304186)：河北省自然科学基金资助项目(2014209191)：河北省教育厅科研资助项 目(YQ2013003)工程科学学报，第 38 卷，第 2 期: 223--229，2016 年 2 月 Chinese Journal of Engineering，Vol． 38，No． 2: 223--229，February 2016 DOI: 10． 13374 /j． issn2095--9389． 2016． 02． 010; http: / /journals． ustb． edu． cn 预处理组织对低碳钢 IQ＆P 工艺下组织及性能影响 陈连生1) ，张健杨1) ，田亚强1) ，宋进英1) ，徐 勇1，2) ，张士宏2) 1) 河北联合大学冶金与能源学院，唐山 063009 2) 中国科学院金属研究所，沈阳 110016  通信作者，E-mail: tyqwylfive@ 163． com 摘 要 采用 γ 单相区和 γ + α 双相区轧制并淬火工艺以及双相区再加热--淬火--碳配分( IQ＆P) 工艺，研究预处理组织对低 碳钢室温状态多相组织特征及力学性能的影响规律． 实验用低碳钢经两种工艺轧制并淬火处理，获得马氏体和马氏体 + 铁 素体的预处理组织，再经双相区 IQ＆P 工艺处理后均获得多相组织． 马氏体预处理钢的室温组织由板条状亚温铁素体、块状 回火马氏体以及一定比例的针状未回火马氏体和 8. 2% 的针状残余奥氏体组成; 马氏体 + 铁素体预处理钢由板条状亚温铁素 体、块状和针状未回火马氏体以及 14. 3% 的短针状或块状残余奥氏体组成． 在相同的双相区 IQ＆P 工艺参数下，预处理组织 为马氏体的钢抗拉强度为 770 MPa，伸长率为 28% ，其强塑积为 21560 MPa·% ; 而预处理组织为马氏体 + 铁素体的钢抗拉强度 为 834 MPa，伸长率增大到 36. 2% ，强塑积达到 30190 MPa·% ，获得强度与塑性的优良结合． 关键词 低碳钢; 多相钢; 预处理组织; 形态; 力学性能 分类号 TG142. 2 收稿日期: 2014--11--26 基金项目: 国家自然科学基金项目资助项目( 51254004，51304186) ; 河北省自然科学基金资助项目( E2014209191) ; 河北省教育厅科研资助项 目( YQ2013003) Effect of pretreated microstructure on the morphology and mechanical properties of low-carbon steel with IQ＆P treatment CHEN Lian-sheng1) ，ZHANG Jian-yang1) ，TIAN Ya-qiang1)  ，SONG Jin-ying1) ，XU Yong1，2) ，ZHANG Shi-hong2) 1) School of Metallurgy and Energy Engineering，Hebei United University，Tangshan 063009，China 2) Institute of Metal Ｒesearch，Chinese Academy of Sciences，Shenyang 110016，China  Corresponding author，E-mail: tyqwylfive@ 163． com ABSTＲACT The effects of pretreated microstructure on the multiphase microstructure features at room temperature and the mechani￾cal properties of low-carbon steel were studied by the treatment of water cooling after hot-rolling in the γ phase region or in the γ + α phase region followed by the treatment of intercritical reheating--quenching--partitioning ( IQ＆P) ． Two different pretreated microstruc￾tures，which are martensite and martensite + ferrite，are obtained by the two different hot-rolling and quenching processes． After IQ＆P，the steel with martensite as pretreated microstructure，in which the volume fraction of retained austenite is 8. 2% ，is turned into a multi-phase structure composed of lath intercritical ferrite，block tempered martensite，needle-like untempered martensite，and retained austenite． While the steel with martensite + ferrite as pretreated microstructure，in which the volume fraction of retained austenite is 14. 3% ，is turned into a multi-phase structure composed of lath intercritical ferrite，block or needle-like untempered martensite，and short needle-like or block retained austenite． With the same IQ＆P process parameters，the tensile strength of the steel with martensite as pretreated microstructure is 770 MPa，the elongation is 28% ，and the product of strength and elongation is 21560 MPa·% ． While the tensile strength of the steel with martensite + ferrite as pretreated microstructure is 834 MPa，the elongation increases to 36. 2% ，and the product of strength and elongation reaches to 30190 MPa·% ． In other words，the steel has obtained a good combination of strength and ductility．