通过分段冷却实验,研究了冷却速度和等温温度对GCr15SiMn轴承钢中碳化物析出规律及C、Cr、Mn元素扩散规律的影响.结果表明:当冷却速度大于5℃/s,能够有效抑制网状碳化物出现;当珠光体相变温度在590 ～620℃时,既能抑制C、Cr、Mn元素向奥氏体晶界扩散,防止二次碳化物在珠光体相变过程中出现,又能形成良好的索氏体组织.当相变温度达到650℃时,二次碳化物可以在低于Arl的温度区间随着珠光体相变析出.通过对实验数据进行线性拟合,得出珠光体片层厚度和过冷度的经验公式为Sp-1=-3.81×10-3 +1.166×10-4△T.
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