【摘要】 利用热力学软件Thermo-calc结合高温激光扫描共聚焦显微镜（HT-LSCM）及扫描电子显微镜（SEM）、能谱仪（EDS）与电子背散射衍射（EBSD）等试验手段，探究高铬钢在凝固和热处理过程的组织演变规律，为实际热处理工艺制定提供理论依据。结果表明：高铬钢在凝固过程发生共晶反应之后，会在奥氏体相表面再次形成针状富铬碳化物，随温度降低沿长轴快速长大，贯穿奥氏体基体。高铬钢在1080℃保温过程中，析出颗粒状M₇C₃型碳化物，为淬火态高铬钢主要析出相。回火后析出M₂₃C₆型碳化物，M₇C₃型碳化物无明显变化。二次M₂₃C₆型碳化物在马氏体中析出与长大，是回火过程中主要相变。更多还原

【Abstract】 Using thermodynamic software Thermo-calc combined with high temperature laser scanning confocal microscope（HT-LSCM） and scanning electron microscope（SEM）, energy spectrometer（EDS） and electron backscattering diffraction（EBSD） and other experimental means, to investigate the organization evolution of high-chromium steel in the solidification and heat treatment process, in order to provide a theoretical basis for the development of the actual heat treatment process. The results show that after the eutectic reaction occurs in the solidification process of high-Cr steel, the needle-like chromium-rich carbides will be formed on the surface of austenite phase again, and grow rapidly along the long axis with the temperature decrease, and penetrate through the austenite matrix. High chromium steel at 1080 ℃ insulation process, precipitation of granular M₇C₃ type carbides, for the quenched state of high chromium steel main precipitation phase. After tempering precipitation of M₂₃C₆ type carbides, M₇C₃ type carbides have no significant change. Secondary M₂₃C₆ carbide precipitation and growth in martensite, is the main phase change in the tempering process.更多还原