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利用Gleeble3500分析了GCr15轴承钢冷却过程相变规律及合金元素的影响,基于热力学理论计算分析了先共析渗碳体析出行为。结果表明:渗碳体析出、珠光体转变和全部马氏体转变的临界冷速分别为5、10和15℃/s;Mo元素的添加和Si、Mn元素含量的提高,均使得相转变区间向右移动,提高了试验钢的淬透性;C、Cr元素含量的变化对先共析渗碳体析出温度影响较大,其它元素含量的增加并没有明显的影响。
Gleeble3500 was used to analyze the phase transformation of GCr15 bearing steel during cooling and the effect of alloying elements. The precipitation behavior of pro-eutectoid cementite was calculated based on the thermodynamic theory. The results show that the critical cooling rates of cementite precipitation, pearlite transformation and all martensitic transformation are 5, 10 and 15 ℃ / s, respectively. The addition of Mo and the increase of Si and Mn contents all make the phase transitions Move to the right, to improve the hardenability of the test steel; C, Cr content changes on the pro-eutectoid cementite precipitation temperature greater influence, other elements of the increase has no significant effect.