摘要
采用光学显微镜(OM)、扫描电镜(SEM)、能谱仪(EDS)和显微硬度仪等研究了DC53钢经900~1 100℃后淬火、200℃和500℃回火调质处理后组织性能的变化规律。结果表明:在950℃淬火时,材料的硬度最高,为761 HV,随着淬火温度升高,钢中Cr-Mo-V型碳化物的析出数量减少,晶粒尺寸增大,当温度升高到1 000℃时,出现了超过6μm尺寸的析出相,但温度继续升高至1 100℃时,碳化物几乎完全溶解,显微硬度降低;经1 000℃淬火、回火处理后,钢的显微组织均为回火马氏体+少量残余奥氏体+Cr-Mo-V型碳化物,且碳化物呈细小、均匀分布状态;500℃回火时钢的冲击功仅41.5 J/cm^(-2),较200℃回火时下降了19.65 J/cm^(-2),而硬度未明显下降。1 000℃淬火、500℃回火时DC53钢的综合性能最佳,表现出良好的硬度和韧性。研究结果为优化DC53钢的热处理工艺,提升其在模具制造中的应用性能提供了理论依据和技术支持。
The variation laws of microstructure and properties of DC53 steel after quenching at 900~1100℃and tempering at 200℃and 500℃were studied by using optical microscope(OM),scanning electron microscope(SEM),energy dispersive spectrometer(EDS)and microhardness tester,etc.The results show that when quenched at 950℃,the hardness of the material is the highest,which is 761 HV.With the increase of quenching temperature,the amount of precipitated Cr-Mo-V type carbides in the steel decreases and the grain size increases.When the temperature rises to 1000℃,precipitated phases with a size of more than 6μm appear.However,when the temperature continues to rise to 1100℃,the carbides are almost completely dissolved.Decreased microhardness After quenching and tempering treatment at 1000℃,the microstructure of the steel is all tempered martensite+a small amount of residual austenite+Cr-Mo-V type carbides,and the carbides are in a fine and uniformly distributed state.When tempered at 500℃,the impact energy of the steel was only 41.5 J/cm^(-2),which decreased by 19.65 J/cm^(-2) compared with that tempered at 200℃,while the hardness did not decrease significantly.The comprehensive performance of DC53 steel is the best when quenched at 1000℃and tempered at 500℃,showing good hardness and toughness.The research results provide a theoretical basis and technical support for optimizing the heat treatment process of DC53 steel and improving its application performance in mold manufacturing.
作者
何博
栗克建
曾金
赵杰
吕俊杰
He Bo;Li Kejian;Zeng Jin;Zhao Jie;Lv Junjie(School of Metallurgy and Materials Engineering,Chongqing University of Science and Technology,Chongqing 401331,China)
出处
《河北冶金》
2025年第6期25-32,共8页
Hebei Metallurgy
基金
重庆科技大学研究生科技创新项目(YKJCX2220218)
重庆市总工会2022年创新项目“航空航天用特种高强度耐蚀合金开发”。
关键词
DC53
碳化物
强度
淬火
回火
准解理
DC53
carbide
strength
quenching
tempering
quasi-cleavage
