SLD-MAGIC钢的连续冷却转变行为及珠光体相变动力学研究  

Continuous Cooling Transformation Behavior and Pearlite Transformation Kinetic of SLD-MAGIC Steel

作　　者：邓志鹏 吴红庆 吴晓春[1,2,3] DENG Zhipeng;WU Hongqing;WU Xiaochun(School of Materials and Engineering,Shanghai University,Shanghai 200444,China;State Key Laboratory of Advanced Special Steel,Shanghai University Shanghai 200444,China;Shangda Xinlun Material Technology(Guangdong)Co.,Ltd.,Zhaoqing 526105,China)

机构地区：[1]上海大学材料科学与工程学院,上海200444 [2]省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444 [3]上大鑫仑材料科技(广东)有限公司,广东肇庆526105

出　　处：《热加工工艺》2023年第20期119-123,共5页Hot Working Technology

基　　金：国家重点研发计划资助项目(2016YFB0300400)。

摘　　要：研究了SLD-MAGIC钢在连续冷却过程中的组织转变行为和珠光体相变动力学。通过膨胀仪、光学显微镜、扫描电镜、能谱仪和维氏硬度计获得其膨胀曲线、显微组织和维氏硬度,绘制CCT曲线。结果表明:A_(c1)=833℃,A_(ccm)=904℃,M_(s)=192℃。冷却速率为0.01~0.30℃/s和0.1~1.0℃/s时,高温奥氏体分别发生珠光体和贝氏体相变。当冷却速率大于1℃/s时,淬火组织为马氏体和残余奥氏体。通过回归方程,得到冷却速率为0.01、0.02、0.07℃/s下的珠光体相变时间-体积分数的相变动力学模型和生长机制。珠光体相变动力学的Avrami指数n值介于1~3之间,珠光体以一维长大和二维长大。The transformation behavior and pearlite transformation kinetics of SLD-MAGIC steel during continuous cooling rates were investigated.The dilatometric curves,microstructure and microhardness were studied by thermal dilatometer,OM,SEM,EDS and Vicker's hardness testing system,and CCT curve was plotted.The results show that A_(c1)=833℃,A_(ccm)=904℃and M_(s)=192℃.When the cooling rates is 0.01-0.30℃/s and 0.1-1.0℃/s,the pearlite and bainite phase are transformed respectively from the austenite at high temperature.When the cooling rate is more than 1℃/s,quenched structure is martensite and retained austenite.When the cooling rates are 0.01℃/s,0.02℃/s,0.07℃/s,the model of pearlite transformation time and volume fraction and growth mold are obtained by regression equation.The Avrami exponents n of the pearlite transformation kinetics are between 1 and 3,and the pearlite grows in one dimension and two dimension.

关 键 词：SLD-MAGIC钢 CCT曲线 冷却速率 相变动力学 

分 类 号：TG151.2[金属学及工艺—热处理]