淬火工艺对铁素体/马氏体双相钢组织与性能的影响  

Effect of quenching processes on microstructure and mechanical properties of a ferrite-martensite dual-phase steel

作　　者：石磊 田鹏勇 温国强 魏明江 赵宇 Shi Lei;Tian Pengyong;Wen Guoqiang;Wei Mingjiang;Zhao Yu(School of Automobile and Rail Transportation,Tianjin Sino-German University of Applied Sciences,Tianjin 300350,China)

机构地区：[1]天津中德应用技术大学汽车与轨道交通学院,天津300350

出　　处：《金属热处理》2025年第3期138-142,共5页Heat Treatment of Metals

基　　金：天津市企业科技特派员项目(23YDTPJC00700)。

摘　　要：通过光学显微镜、扫描电镜、透射电镜和拉伸、冲击试验,研究了预冷淬火、亚温淬火两种不同淬火工艺对铁素体/马氏体双相钢经相同回火处理后组织和力学性能的影响。结果表明,不同工艺淬火试验钢的回火态组织均由铁素体、回火马氏体和M_(23)C_(6)析出相组成。预冷淬火+回火工艺得到块状的双相组织,而亚温淬火+回火工艺得到细化的板条状组织。不同工艺淬火试验钢的回火态屈服强度和抗拉强度均降低,而屈强比、伸长率和冲击吸收能量增加。与预冷淬火相比,亚温淬火试验钢的回火态屈服强度和抗拉强度较低,而屈强比、伸长率和冲击吸收能量较高,表明亚温淬火+回火工艺更能明显提高试验钢的塑韧性。Effects of two different quenching processes(delay quenching,intercritical quenching)on the microstructure and mechanical properties of a ferrite/martensite dual-phase steel after the same tempering treatment were studied by means of optical microscope,scanning electron microscope,transmission electron microscope and tensile and impact tests.The results show that the microstructure of the as-tempered steel quenched by the two different processes consists of ferrite,tempered martensite and M_(23)C_(6)precipitates.Polygonal dual-phase structure is obtained by the delay quenching+tempering process,while fine lath structure is obtained by the intercritical quenching+tempering process.The yield strength and tensile strength of the as-tempered tested steel quenched by the two different processes decrease,while the yield ratio,elongation and impact absorbed energy increase.Compared with the delay quenching process,the yield strength and tensile strength of the as-tempered steel under intercritical quenching process are lower,while the yield ratio,elongation and impact absorbed energy are higher,which show that the intercritical quenching+tempering process can significantly improve the plasticity and toughness of the tested steel.

关 键 词：双相钢 预冷淬火 亚温淬火 回火 力学性能 

分 类 号：TG161[金属学及工艺—热处理]