Effect of Austenitizing Time on Spheroidized Microstructure of Bearing Steel GCr15
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摘要: 采用光学显微镜和扫描电子显微镜对GCr15轴承钢热轧穿孔后、805℃奥氏体化不同时间后以及三种不同球化退火工艺后的组织进行研究。结果表明:组织中存在两种碳化物粒子,一种是比较大的先共析碳化物粒子,一种是小的碳化物粒子。随着805℃保温时间的延长,片层珠光体逐渐消失,小的碳化物粒子在数量上逐渐减少,在尺寸上逐渐变小,先共析碳化物粒子的大小和分布形态没有显著变化;三种球化退火工艺下,硬度相差不大。Abstract: After hot-rolling and subsequent perforating,austenitizing at 805℃ for different lengths of time and three different spheroidizing annealing processes,the microstructures of bearing steel GCr15 were investigated using optical microscope and SEM.The results show that there are two types of microstructures in the GCr15,including relatively big proeutectoid carbide particles and small carbide particles.As time prolongs at a holding temperature of 805℃,the lamellar pearlite gradually disappears,and small carbide particles are also reduced in number and become smaller in size while the size and distribution pattern of proeutectoid carbide particles remain basically unchanged.The hardness of specimens is similar under three spheroidizing annealing processes.
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Key words:
- GCr15 /
- austenitizing time /
- carbide /
- spheroidizing annealing
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