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通过热膨胀试验研究实验钢的等温转变动力学,采用盐浴等温淬火工艺制备超细贝氏体组织,利用扫描电镜、透射电镜和X射线衍射仪定量分析工艺参数对微观组织结构的影响.结果显示:实验钢室温组织由大量超细板条状贝氏体铁素体和板条间分布的薄膜状奥氏体的复相组织构成,210℃等温淬火得到的贝氏体板条间距细化到约60 nm,硬度约为HBW610;实验钢的最终组织特征取决于发生贝氏体转变的等温温度和等温时间,等温温度越低时贝氏体转变完成需要的等温时间越长.
The isothermal transformation kinetics of the experimental steel was studied by thermal expansion test. The microstructure of ultrafine bainite was prepared by the salt bath isothermal quenching process. The microstructure was analyzed quantitatively by scanning electron microscopy, transmission electron microscopy and X-ray diffraction. : The experimental steel room temperature microstructure consists of a large number of ultrafine lath bainitic ferrite and lath between the film-like austenite complex phase structure, 210 ℃ isothermal quenching bainite lath spacing refined to About 60 nm and a hardness of about HBW610. The final microstructure of the experimental steel depends on the isothermal temperature and isothermal time at which bainite transformation takes place. The longer the isothermal temperature, the longer the isothermal time required for the bainite transformation to finish.