GCr15钢快速球化中离异共析转变临界过冷度的物理模型  

Physical model for critical undercooling of divorced eutectoid transformation in fast spheroidization annealing of GCr15 steel

作　　者：陈其伟[1,2] 关建辉[2] 朱国辉[2] 赵爱民[1] 

机构地区：[1]北京科技大学高校轧制国家工程研究中心,北京100083 [2]安徽工业大学材料科学与工程学院,安徽马鞍山243002

出　　处：《材料热处理学报》2013年第4期182-186,共5页Transactions of Materials and Heat Treatment

摘　　要：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 control the spheroidizing annealing process of GCr15 steel, a physical model for calculating the critical undercooling of the divorced eutectoid transformation in GCr15 steel was proposed according to diffusion and phase transition theory. The factors which affect the critical undercooling of divorced euteetoid transformation were discussed. Through the method of quantitative metallography, austenitic interrupt quenching experiment and the isothermal spheroidizing experiments, at differen temperatures this model was verified. Result shows that, the more the volume fraction of the undissolved carbides and the smaller average carbide particle size, the lower critical phase transition temperature of divorced eutectoid transformation. The calculated result by the physical model coincides well with the experiments. This model can provide the ration for design and optimization of the fast spheroidizing annealing of GCr15 steel.

关 键 词：离异共析转变 球化 过冷度 数学模型 临界点A1 

分 类 号：TG151.2[金属学及工艺—热处理]