QP980钢的连续冷却转变曲线及显微组织  

Continuous Cooling Transformation Curve and Microstructure of QP980 Steel

作　　者：易寒 彭立培 蔡周彦 夏玉琳 白佳鑫 刘腾轼 YI Han;PENG Lipei;CAI Zhouyan;XIA Yulin;BAI Jiaxin;LIU Tengshi(Zhejiang Institute of Advanced Materials,Shanghai University,Jiaxing Zhejiang 314113,China;School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Technology Center of Hebei Longfengshan Casting Co.,Ltd.,Handan Hebei 056300,China)

机构地区：[1]上海大学(浙江)高端装备基础件材料研究院,浙江嘉兴314113 [2]上海大学材料科学与工程学院,上海200444 [3]河北龙凤山铸业有限公司技术中心,河北邯郸056300

出　　处：《上海金属》2025年第2期50-53,共4页Shanghai Metals

摘　　要：利用DIL805A热膨胀仪测定了QP980钢以不同速率冷却时的热膨胀曲线。采用切线法结合显微组织及硬度检测绘制了该钢的连续冷却转变曲线。结果表明:QP980钢的临界点Ac1和Ac3分别为707和891℃;以≤1℃/s的速率冷却后QP980钢的组织为铁素体、珠光体和贝氏体,以2℃/s的速率冷却后为铁素体、贝氏体和马氏体,以≥5℃/s的速率冷却后为全马氏体。Thermal expansion curves of QP980 steel during cooling at different rates were measured by DIL805A thermal expansion instrument,and the continuous cooling transformation curve of the steel was drawn by using the tangent method in conjunction with microstructure and hardness examination.The results showed that(a)the critical points Ac1 and Ac3 of the QP980 steel were 707 and 891℃,respectively;and(b)the microstructure of the steel was ferrite,pearlite,and bainite after cooling at rate no greater than 1℃/s,ferrite,bainite and martensite after cooling at rate of 2℃/s,and all martensite after cooling at rate no less than 5℃/s.

关 键 词：QP980 钢 显微组织 硬度 CCT 曲线 

分 类 号：TG335[金属学及工艺—金属压力加工]