工程科学学报，第41卷，第3期：325-331,2019年3月 Chinese Journal of Engineering,Vol.41,No.3:325-331,March 2019 DOI:10.13374/j.issn2095-9389.2019.03.005:http://journals.ustb.edu.cn 两相区位错增殖对低碳贝氏体/铁素体复相钢组织和 性能的影响 田亚强，田耕，王安东，郑小平，魏英立，宋进英，陈连生区 华北理工大学教有部现代治金技术重点实验室，唐山063009 ☒通信作者，E-mail:zz@ncst.cdu.cm 摘要利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、电子探针(EPMA)、X射线衍射仪(XRD)、室温拉伸等手段，通 过两相区保温一淬火(IQ)、两相区形变后保温一淬火(DIQ)、两相区保温一淬火一配分一贝氏体区等温(Q&PB)及两相区形变后 保温一淬火配分一贝氏体区等温(DQ&PB)热处理工艺，研究高温形变对室温组织、性能、残余奥氏体稳定性的综合影响作用. 结果表明，经15%的压缩形变后铁素体中位错密度由0.290×104增加至1.286×10“m2,马氏体（原奥氏体）中C、Cu元素富 集浓度提高，高温形变产生位错增殖对元素配分有明显促进作用.DIQ&PB工艺下，形变后贝氏体板条尺寸变短且宽度增加 0.1μm左右，贝氏体转变量较未变形时增加14%，多边形铁素体尺寸明显减小.力学性能方面，两相区形变热处理后抗拉强 度增加132.85MPa,断后伸长率增加7%，强塑积可达25435MPa·%.形变后残余奥氏体体积分数由7.8%提高到8.99%，残 余奥氏体中碳质量分数由1.05%提高到1.31%. 关键词两相区保温一淬火一配分一贝氏体区等温工艺：两相区形变：位错增殖：残余奥氏体；强塑积 分类号TG142.2 Effect of dislocation multiplication in intercritical region on microstructure and properties of low-carbon bainite/ferrite multiphase steel TIAN Ya-qiang,TIAN Geng,WANG An-dong,ZHENG Xiao-ping,WEI Ying-i,SONG Jin-ying,CHEN Lian-sheng Key Laboratory of the Ministry of Education for Modern Metallurgy Technology,North China University of Science and Technology,Tangshan 063009, China Corresponding author,E-mail:zyzx@nest.edu.cn ABSTRACT Hot deformation is a way to effectively improve strength and plasticity of multiphase steels simultaneously,thereby, improving mechanical properties of multiphase steels.Hot deformation affects martensitic transformation mechanism,microstructure, and mechanical properties because it increases retained austenite content and improves stability of multiphase steels.Moreover,hot deformation plays a role in dislocation multiplication,and fine grain strengthening:it can reduce bainite transformation driving force, reduce bainite transformation point,and result in small multiphase organization after quenching-partitioning process.The result can sig- nificantly improve the properties of materials.The effects of high-temperature deformation on the stability of room-temperature micro- structure,mechanical property,and retained austenite under treatment of IQ&PB (intercritical annealing-quenching and partitioning within the bainitic region)and DIQ&PB (intercritical deformation-intercritical annealing-quenching and partitioning within the bainitic region)processes were studied using scanning electron microscopy (SEM),transmission electron microscope (TEM),electron probe X-ray microanalyser(EPMA),X-ray diffraction (XRD),and tensile testing machine.The results show that dislocation density increa- 收稿日期：2017-07-11 基金项目：国家自然科学基金资助项目(51574107)：河北省自然科学基金资助项目(E2016209048):河北省自然科学基金资助项目 (E2017209048):河北省高等学校科学技术研究资助项目(0N2016185):唐山市科技创新团队培养计划资助项目(15130202C)工程科学学报，第 41 卷，第 3 期: 325--331，2019 年 3 月 Chinese Journal of Engineering，Vol． 41，No． 3: 325--331，March 2019 DOI: 10． 13374 /j． issn2095--9389． 2019． 03． 005; http: / /journals． ustb． edu． cn 两相区位错增殖对低碳贝氏体 /铁素体复相钢组织和 性能的影响 田亚强，田 耕，王安东，郑小平，魏英立，宋进英，陈连生 华北理工大学教育部现代冶金技术重点实验室，唐山 063009 通信作者，E-mail: zyzx@ ncst． edu． cn 摘 要 利用扫描电子显微镜( SEM) 、透射电子显微镜( TEM) 、电子探针( EPMA) 、X 射线衍射仪( XＲD) 、室温拉伸等手段，通 过两相区保温--淬火( IQ) 、两相区形变后保温--淬火( DIQ) 、两相区保温--淬火--配分--贝氏体区等温( IQ＆PB) 及两相区形变后 保温--淬火--配分--贝氏体区等温( DIQ＆PB) 热处理工艺，研究高温形变对室温组织、性能、残余奥氏体稳定性的综合影响作用． 结果表明，经15% 的压缩形变后铁素体中位错密度由 0. 290 × 1014增加至 1. 286 × 1014 m － 2，马氏体( 原奥氏体) 中 C、Cu 元素富 集浓度提高，高温形变产生位错增殖对元素配分有明显促进作用． DIQ＆PB 工艺下，形变后贝氏体板条尺寸变短且宽度增加 0. 1 μm 左右，贝氏体转变量较未变形时增加 14% ，多边形铁素体尺寸明显减小． 力学性能方面，两相区形变热处理后抗拉强 度增加 132. 85 MPa，断后伸长率增加 7% ，强塑积可达 25435 MPa·% ． 形变后残余奥氏体体积分数由 7. 8% 提高到 8. 99% ，残 余奥氏体中碳质量分数由 1. 05% 提高到 1. 31% ． 关键词 两相区保温--淬火--配分--贝氏体区等温工艺; 两相区形变; 位错增殖; 残余奥氏体; 强塑积 分类号 TG142. 2 收稿日期: 2017--07--11 基金项目: 国家自然科学基金资助项目 ( 51574107 ) ; 河北省自然科学基金资助项目 ( E2016209048 ) ; 河北省自然科学基金资助项目 ( E2017209048) ; 河北省高等学校科学技术研究资助项目( QN2016185) ; 唐山市科技创新团队培养计划资助项目( 15130202C) Effect of dislocation multiplication in intercritical region on microstructure and properties of low-carbon bainite /ferrite multiphase steel TIAN Ya-qiang，TIAN Geng，WANG An-dong，ZHENG Xiao-ping，WEI Ying-li，SONG Jin-ying，CHEN Lian-sheng Key Laboratory of the Ministry of Education for Modern Metallurgy Technology，North China University of Science and Technology，Tangshan 063009， China Corresponding author，E-mail: zyzx@ ncst． edu． cn ABSTＲACT Hot deformation is a way to effectively improve strength and plasticity of multiphase steels simultaneously，thereby， improving mechanical properties of multiphase steels． Hot deformation affects martensitic transformation mechanism，microstructure， and mechanical properties because it increases retained austenite content and improves stability of multiphase steels． Moreover，hot deformation plays a role in dislocation multiplication，and fine grain strengthening; it can reduce bainite transformation driving force， reduce bainite transformation point，and result in small multiphase organization after quenching-partitioning process． The result can sig￾nificantly improve the properties of materials． The effects of high-temperature deformation on the stability of room-temperature micro￾structure，mechanical property，and retained austenite under treatment of IQ＆PB ( intercritical annealing-quenching and partitioning within the bainitic region) and DIQ＆PB ( intercritical deformation-intercritical annealing-quenching and partitioning within the bainitic region) processes were studied using scanning electron microscopy ( SEM) ，transmission electron microscope ( TEM) ，electron probe X-ray microanalyser ( EPMA) ，X-ray diffraction ( XＲD) ，and tensile testing machine． The results show that dislocation density increa-