SCM435冷镦钢奥氏体连续冷却转变曲线研究.pdfVIP

鞍 韵 技 术 2016年第5 期 ANGANG TECHNOLOGY 总第401期 ( 究 与 幵 0 SCM435冷徽钢奥氏体连续冷却转变曲线研究 杨静\罗建华2,李桂艳1，赵宝纯\黄磊 王晓峰1 (1.鞍钢集团钢铁研究院，辽宁鞍山114009; 2.鞍钢股份有限公司炼钢总厂，辽宁鞍山114021) 摘要：利用 GleeWe-3800热模拟试验机，采用热膨账法结合硬度测量，研究了 SCM435冷 镦钢的连续冷却转变过程，通过光学显微镜、电子探针分析了不同冷速下SCM..435冷镦钢的组 织转变行为。结果表明，SCM435冷镦钢冷速低于1 ti /s 时，组织主要为铁素体+珠光体+贝氏 体，在 l -lO T /s 冷速范围内，组织主要为贝氏体和少量珠光体+铁素体或马氏体，冷速大于10 T/s 时，组织为马氏体。 关键词：冷镦钢；连续冷却转变；显微组织 中图分类号：TG151 文献标识码： A 文章编号： 1006-4613(2016)05-0022-04 Study on Continuous Cooling Transformation Curves of Austenite in SCM435 Cold Heading Steel Yang Jing^Luo Jianhua2,Li Guiyan^Zhao Baochun1, Huang Lei1, Wang Xiaofeng (1. Iron Steel Research Institutes of Ansteel Group Corporation, Anshan 4009, Liaoning, China; 2. General Steelmaking Plant of Angang Steel Co., Ltd., Anshan 4021, Liaoning, China) Abstract ：The continuous cooling transformation curves of the austenite in SCM435 cold heading steel was studied by the thermal dilation method and hardness test on the Gleeble-3800 thermal simulated test machine. The transformation behaviors of the microstructures in SCM435 cold heading steel at various cooling speed was analyzed by optical microscopy analysis and electron probe. The study results show that the microstructures in the SCM435 cold heading steel are composed of ferrite, pearlite and bainite when the cooling speed is below 1 T!/s, while the micro structures are composed of main bainite, small pearlite and ferrite or martensite when the cooling speed is in the range from 1 °C /s to 10 °C /s and the microstructures is the simplex