GCr15SiMo轴承钢球化退火过程的碳化物演变

借助差示扫描量热法、扫描电镜等检测分析手段以及JMatPro热力学软件，研究了等温球化退火的奥氏体化温度和保温时间对GCr15SiMo轴承钢碳化物的影响。结果表明，随着奥氏体化温度的升高和保温时间的延长，GCr15SiMo轴承钢中碳化物趋于均匀化、细小化，且有利于GCr15SiMo轴承钢退火过程碳化物球化效果。在奥氏体化温度为800℃、保温时间为30 min的等温球化退火工艺下，GCr15SiMo轴承钢中碳化物数量多、尺寸小、弥散分布度高，且组织最为均匀致密，硬度较低，球化效果最好。

Carbide evolution of GCr15SiMo bearing steel during spheroidizing annealing process

Influence of austenitizing temperature and holding time of isothermal spheroidizing annealing on carbide of GCr15SiMo bearing steel was studied by means of differential scanning calorimetry, scanning electron microscope and other detection and analysis methods and JMatPro thermodynamic software. The results show that with the increase of austenitizing temperature and holding time, the carbides in the GCr15SiMo bearing steel tend to be homogenized and refined, which is beneficial to the spheroidization effect of carbides in the annealing process of the GCr15SiMo bearing steel. Under the isothermal spheroidizing annealing process with austenitizing temperature of 800 ℃ and holding time of 30 min, the GCr15SiMo bearing steel produces a large amount of carbides, small size, high dispersion distribution, the most uniform and compact structure, low hardness and the best spheroidizing effect.