高淬低回复合冷处理工艺对DC53钢组织性能的影响  

Effect of High Quenching and Low Tempering Compound Cold Treatment Process on the Microstructure and Properties of DC53 Steel

作　　者：宋绍峰 李秀兰 王宣 杨阳 刘秀珍 SONG Shao-feng;LI Xiu-lan;WANG Xuan;YANG Yang;LIU Xiu-zhen(School of Mechanical Engineering,Chongqing Vocational and Technical University of Mechatronics,Chongqing 402760,China;School of Mechanical Engineering,Sichuan University of Science&Engineering,Yibin 644000,China)

机构地区：[1]重庆机电职业技术大学机械工程学院,重庆402760 [2]四川轻化工大学机械工程学院,四川宜宾644000

出　　处：《材料保护》2023年第4期124-130,共7页Materials Protection

基　　金：重庆市教委科技项目(KJQN202203704、KJQN202003704)资助。

摘　　要：基于1040℃淬火+200℃回火复合冷处理工艺,研究高淬低回热处理复合冷处理工艺对DC53钢组织性能的影响。结果表明:冷处理温度未改变物相析出种类,物相由马氏体、奥氏体、(Cr_(2.5)Fe_(4.3)Mo_(0.1))C3和(Cr,Fe)_(7)C_(3)型碳化物组成,温度诱发的马氏体择优取向、晶格畸变或层错逐步增强,-196℃时最为剧烈。当-11℃冷处理时驱动力不足碳化物析出较少;-80℃时碳化物析出量最多,以M7C3型碳化物为主;-196℃时碳原子扩散动力学不足而固溶于马氏体中。-80℃条件下试样组成相配合最佳,其硬度值59.6 HRC,冲击吸收功9.2 J,较未冷处理的试样硬度提升近5%,韧性提升1.875倍;冲刷腐蚀磨损性能随温度的降低而先升后降,冲刷腐蚀18 h后磨损率为7.65 mg/cm^(2)相对性能提升近17%。Based on 1040℃quenching+200℃tempering compound cold treatment process,the effect of high quenching and low reheating treatment compound cold treatment process on the microstructure and properties of DC53 steel was studied.Results showed that the cold treatment temperature did not change the precipitation phase type,and the phase was composed of martensite,austenite,(Cr_(2.5)Fe_(4.3)Mo_(0.1))C3 and(Cr,Fe)_(7)C_(3)carbides.The preferred orientation,lattice distortion or stacking fault of martensite induced by temperature were gradually enhanced,which was most intense at-196℃.In case of a cold treatment at-11 C,the driving force was insufficient and the carbide precipitation amount was smaller;At-80℃,the precipitation amount of carbides was largest,mainly composed of M7C3 carbides.At-196℃,the diffusion kinetics of carbon atom was insufficient and it was solid-soluble in martensite.Under the condition of-80℃,the phase composition of the sample was the best,the hardness value was 59.6 HRC,the impact absorption energy was 9.2 J,the hardness was increased by nearly 5%compared with the samples without cold treatment,and the toughness was increased by 1.875 times.The erosion corrosion wear performance increased first and then decreased with the decrease of temperature.The wear rate after 18 h of erosion corrosion was 7.65 mg/cm^(2),and the relative performance was increased by nearly 17%.

关 键 词：高温淬火+低温回火 冷处理 DC53冷作模具钢 组织性能 

分 类 号：TB31[一般工业技术—材料科学与工程]