塑料模具用4Cr13钢的连续冷却转变分析  

Analysis of continuous cooling transformation of 4Cr13 steel for plastic mold

作　　者：赵峥嵘 张雲飞 赵英利 樊明强 白丽娟 刘丽君 Zhao Zhengrong;Zhang Yunfei;Zhao Yingli;Fan Mingqiang;Bai Lijuan;Liu Lijun(Special Materials Research and Development Center,Material Technology Research Institute of HBIS Group,Shijiazhuang Hebei 052165,China)

机构地区：[1]河钢材料技术研究院特种材料研发中心,河北石家庄052165

出　　处：《金属热处理》2025年第2期69-73,共5页Heat Treatment of Metals

摘　　要：采用真空感应炉制备了塑料模具用4Cr13钢,利用DIL805A型淬火热膨胀仪测定了其相变点及连续冷却转变(CCT)曲线,并结合组织观察及硬度测试对其连续冷却转变过程进行了分析。结果表明,4Cr13钢的相变点为Ac_(1)=857℃、Ac_(3)=937℃,CCT曲线上只存在珠光体转变区和马氏体转变区。4Cr13钢马氏体转变温度区间为67~397℃,具有良好的淬透性。冷却速度为0.01~0.05℃/s时,4Cr13钢相变主要产物为珠光体,硬度较低,为172~193 HV;冷却速度为0.1~1℃/s时,组织为马氏体和未转变残留奥氏体,硬度提高为528~688 HV;当冷却速度≥1℃/s时,彻底完成马氏体转变。4Cr13 steel for plastic mold was prepared by vacuum induction furnace,its phase transition points and continuous cooling transformation(CCT)curve were measured by using a DIL805A quenching thermal dilatometer,and its continuous transformation process was analyzed by combining microstructure observation and hardness test.The results show that the phase transition points of the tested 4Cr13 steel are Ac_(1)=857℃,Ac_(3)=937℃,and there are only pearlite transformation zone and martensite transformation zone on the CCT curve.The 4Cr13 steel has a good hardenability,and the martensitic transformation temperature range is 67-397℃.When the cooling rate is 0.01-0.05℃/s,the main product of phase transformation of the 4Cr13 steel is pearlite,and the hardness is low,which is 172-193 HV.When the cooling rate is 0.1-1℃/s,the microstructure is martensite and retained austenite,and the hardness is increased to 528-688 HV.When the cooling rate is≥1℃/s,the martensitic transformation is completely finished.

关 键 词：4CR13钢 CCT曲线 相变点 组织 硬度 

分 类 号：TG151.2[金属学及工艺—热处理]