利用扫描电镜（SEM）对渗碳体粒化后冷却至710℃保温不同时间淬火的GCr15轴承钢渗碳体的球化长大行为进行研究。结果表明：渗碳体颗粒球化长大由相变和Ostwald熟化两种机制实现,保温时间少于240 min时主要为相变机制,保温时间多于240 min时主要为Ostwald熟化机制;渗碳体颗粒全面起动Ostwald熟化机制的临界半径γc为0.105μm;无论是相变机制还是Ostwald熟化机制,晶界处渗碳体颗粒的平均长大速率（0.0056μm/min）高于晶粒内部渗碳体颗粒的平均长大速率。
Spheroidizing behaviour of GCr15 bearing steel annealed at 710 ℃ for different holding time was investigated by SEM. The results indicate that the spheroidization of cementite particles is achieved by spheroidizing mechanism of phase transformation and Ostwald ripening mechanism. When holding time is less than 240 min, the spheroidizing mechanism of phase transformation takes place, otherwise, the Ostwald ripening mechanism works. The critical radius y, with which the latter mechanism initiates is approximately 0. 105 μm. At the same time, the average spheroidizing growth rate （0. 0056 μm/min） of cementite particles at the grain boundary is higher than that in the grain.
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