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为了实现GCr15钢球化过程的计算机控制,根据相变和扩散理论,建立了GCr15钢离异共析转变临界过冷度的计算模型,讨论了影响离异共析转变临界过冷度的因素。并采用定量金相方法,通过奥氏体中断淬火和等温球化实验对模型进行验证。结果表明:GCr15钢奥氏体化后剩余碳化物体积分数越大,碳化物颗粒尺寸越小,离异共析转变的临界相变温度就越低。模型的计算结果与实验吻合,该模型可以为GCr15钢球化退火工艺的设计和优化提供理论依据。
In order to realize the computer control of the GCr15 steel balling process, the calculation model of the critical undercooling of GCr15 steel was established based on the theory of phase change and diffusion. The factors affecting the critical undercooling of the GCr15 steel were discussed. The method of quantitative metallography was used to verify the model through austenite quenching and isothermal spheroidization experiments. The results show that the larger the volume fraction of residual carbide after austenitizing, the smaller the size of carbide particles, the lower the critical phase transition temperature of dissociation eutectoid transformation. The calculated results of the model agree well with the experimental data. The model can provide a theoretical basis for the design and optimization of GCr15 steel ball annealing process.