楔横轧轴类件热变形时奥氏体微观组织演变的预测  

PREDICATION ON AUSTENITE MICROSTRUCTURE EVOLUTION DURING HOT DEFORMATION OF CROSS WEDGE ROLLED SHAFT

作　　者：王敏婷[1] 杜凤山[1] 李学通[2] 郑炀曾[1] 

机构地区：[1]燕山大学亚稳材料重点实验室 [2]燕山大学机械工程学院,秦皇岛066004

出　　处：《金属学报》2005年第2期118-122,共5页Acta Metallurgica Sinica

基　　金：国家自然科学基金重点项目50435010和50075076国家重点基础研究发展规划项目2004CCA06600资助

摘　　要：运用Gleeble-3500热模拟实验机对轴类件用钢40Cr高温热变形的组织形态进行研究,并由金相分析数据回归得出高温奥氏体组织演变数学模型.然后利用非线性有限元法建立了金属成形过程中热、应力、组织相互耦合的刚塑性有限元模型.采用该模型对二辊楔横轧成形工艺进行仿真计算,得出了轧后工件的温度场、变形场、高温奥氏体晶粒尺寸分布等.对比轧后工件奥氏体组织分布的计算结果与实测值可知,两者吻合良好.The microstructural states of steel 40Cr for shafts during hot deformation were investigated using the Gleeble-3500 thermomechanical simulator. Based on the metallographic experimental data, several mathematical expressions have been regressed to quantify the microstructural evolution of austenite. A rigid-plastic finite element (FE) model for simulating the hot forming process was developed with the thermal, mechanical and microstructural phenomena coupled by means of nonlinear finite element method (FEM). Through simulation of the 2-roll cross wedge rolling (CWR), the temperature and strain fields, and the distribution of grain size and so on, were obtained. Compared the calculated results with experimental data, the consistency is demonstrated.

关 键 词：40CR钢 楔横轧 有限元法 微观组织演变 

分 类 号：TG335.1[金属学及工艺—金属压力加工]