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为揭示GCr15轴承钢热处理中碳化物的演变规律,采用Thermo-Calc软件对该成分体系轴承钢碳化物析出行为进行了热力学计算与分析;利用光学显微镜、扫描电镜、XRD、透射电镜等分析了实验钢不同热处理后的精细结构。结果表明:C含量和Cr含量对轴承钢的相组成有很大的影响;淬火后为尺寸大小不均具有高密度孪晶的针状马氏体、弥散分布的200~500 nm的球状碳化物和残留奥氏体的混合组织;随回火时间的延长,残留奥氏体含量降低,针状马氏体中过饱和的碳聚集,析出长度在10 nm左右的棒状碳化物。
In order to reveal the evolution of carbides in the GCr15 bearing steel during heat treatment, thermomechanical calculation and analysis were performed on the precipitation behavior of the bearing steel carbides by using the Thermo-Calc software. The experiments were analyzed by light microscopy, scanning electron microscopy, X-ray diffraction and transmission electron microscopy. Fine structure of steel after different heat treatment. The results show that the content of C and the content of Cr have great influence on the phase composition of bearing steel. After quenching, they are acicular martensite with high-density twins and uneven distribution of 200 ~ 500 nm spherical carbides And residual austenite. With the extension of tempering time, the content of retained austenite decreased and the supersaturated carbon in acicular martensite aggregated and precipitated rod-like carbides with a length of about 10 nm.