奥氏体化温度对1500 MPa冷轧Q&P钢组织性能的影响  

Effect of austenitizing temperature on microstructure and properties of 1500 MPa cold-rolled Q&P steel

作　　者：蔡顺达 辛利峰[3] 宋利伟 阮国庆[3] 孙荣生 钟莉莉 Cai Shunda;Xin Lifeng;Song Liwei;Ruan Guoqing;Sun Rongsheng;Zhong Lili(State Key Laboratory of Metal Material for Marine Equipment and Application,Anshan Liaoning 114009,China;Ansteel Iron&Steel Research Institute,Anshan Liaoning 114009,China;Ansteel Cold Rolling Plant,Anshan Liaoning 114021,China;KOBELCO ANGANG Auto Steel Co.,Ltd,Anshan Liaoning 114009,China)

机构地区：[1]海洋装备用金属材料及其应用国家重点实验室,辽宁鞍山114009 [2]鞍钢集团钢铁研究院,辽宁鞍山114009 [3]鞍钢股份冷轧厂,辽宁鞍山114021 [4]鞍钢神钢冷轧高强汽车钢板有限公司,辽宁鞍山114009

出　　处：《金属热处理》2025年第2期247-250,共4页Heat Treatment of Metals

基　　金：辽宁省自然科学基金(2022-MS-450)。

摘　　要：利用光学显微镜、扫描电镜、X射线衍射仪和拉伸试验机,研究了奥氏体化温度对1500 MPa级Q&P钢的组织、残留奥氏体含量及力学性能的影响。结果表明,不同奥氏体化温度下试验钢经过相同的缓冷、淬火和配分工艺后均由铁素体、马氏体和残留奥氏体组成,但各相的含量和晶粒尺寸存在较大差异。经过相同的缓冷、淬火和配分工艺后,马氏体和残留奥氏体含量随着临界区奥氏体化温度(750、800℃)升高显著增加,高温临界区(800℃)奥氏体化与完全奥氏体化(850℃)温度条件下的相比例无显著差异。试验钢的平均晶粒尺寸随奥氏体化温度的升高而减小。750、800和850℃奥氏体化后试验钢中残留奥氏体体积分数分别为8.7%、13.3%和12.0%。800℃奥氏体化后试验钢的综合力学性能最佳,屈服强度为1169 MPa,抗拉强度为1503 MPa,伸长率为13.3%。力学性能主要受相比例、细晶强化作用和残留奥氏体分布共同影响。Effect of austenitizing temperature on microstructure,retained austenite content and mechanical properties of 1500 MPa grade Q&P steel was studied by means of optical microscope,scanning electron microscope,X-ray diffractometer and tensile testing machine.The results indicate that the tested steel is composed of ferrite,martensite and retained austenite austenitized at different temperatures,slow cooled,quenched and partitioned,but there are significant differences in the content of each phase and grain size.After the same slow cooling,quenching and partitioning process,the content of martensite and retained austenite significantly increases during intercritical austenitizing(750,800℃),while there is no significant difference in the proportion of phases between high-temperature intercritical austenitizing at 800℃and complete austenitizing at 850℃.The average grain size of the tested steel decreases with the increase of austenitizing temperature.The volume fraction of retained austenite in the tested steel austenitized at 750,800 and 850℃is 8.7%,13.3%and 12.0%,respectively.The comprehensive mechanical properties of the tested steel are optimal when austenitized at 800℃,with a yield strength of 1169 MPa,tensile strength of 1503 MPa and elongation of 13.3%.The mechanical properties are mainly affected by the phase proportion,fine grain strengthening effect and retained austenite distribution.

关 键 词：奥氏体化温度 Q&P钢 组织性能 

分 类 号：TG161[金属学及工艺—热处理]