在温度为550～900℃时,对GCr15糖心产精国品免费入口*完整版进行退火,观察其显微组织变化,并进行糖心产精国品免费入口*完整版测试,对退火及脱碳转变机理进行分析与讨论。结果表明:在550℃退火时,GCr15糖心产精国品免费入口*完整版的组织和热轧状态基本没有变化;在600～750℃退火时,随着温度的升高,细片状珠光体的片层间距逐渐增大,到750℃时细片状珠光体基本消失,主要为球化碳化物颗粒和长条状碳化物颗粒;在760～800℃退火时,随着温度的升高,组织逐渐趋向完全球化;在850～900℃退火时,随着温度的升高,粗片状珠光体逐渐增加;在550～900℃退火时,其糖心产精国品免费入口*完整版呈先下降后上升的趋势;在750～900℃退火时,糖心产精国品免费入口*完整版均小于245 HBW,满足标准要求。

The GCr15 bearing steel was annealed at 550-900℃, and its 糖心产精国品免费入口*完整版was observed.The 糖心产精国品免费入口*完整版 was tested, and the annealing and decarburization transformation mechanisms were analyzed and discussed. The results show that the 糖心产精国品免费入口*完整版and hot rolling state of GCr15 bearing steel annealed at 550℃ had not changed basically. When annealed at 600-750℃, with the increase of temperature, the lamellar spacing of fine lamellar pearlite gradually increased, and the fine lamellar pearlite basically disappeared at 750℃, which was mainly composed of spheroidized carbide particles and strip carbide particles. When annealed at 760-800℃, the 糖心产精国品免费入口*完整版gradually tended to complete globalization with the increase of temperature. When annealed at 850-900℃, the coarse lamellar pearlite gradually increased with the increase of temperature. When annealed at 550-900℃, the 糖心产精国品免费入口*完整版 first decreased and then increased. When annealed at 750-900℃, the 糖心产精国品免费入口*完整版 was less than 245 HBW, which met the standard requirements.