大型饼类锻件镦粗过程形变力学演变研究  

Deformation mechanism in the upsetting process of heavy disk-shaped forgings

作　　者：李学通[1] 王敏婷[1] 张沛 杜凤山[1] 

机构地区：[1]燕山大学机械工程学院,河北秦皇岛066004 [2]郑州宇通重工有限公司,郑州450051

出　　处：《材料科学与工艺》2011年第6期53-57,共5页Materials Science and Technology

基　　金：国家自然科学基金资助项目(51075352);河北省自然科学基金资助项目(E2011203090)

摘　　要：针对大型饼类锻件夹层裂纹缺陷形成力学机理问题,采用非线性有限元模拟技术,建立了圆柱锻件镦粗过程的热力耦合分析模型.通过模拟计算,分析了H/D>2时镦粗过程中各向应力场、等效应变、应变速度以及形变梯度分布规律,得出了镦粗过程锻件内部应力状态演变分布图.研究结果表明:对于大型饼类锻件,夹层裂纹缺陷不能从应力状态得出合理的解答,但从三向受压条件下形变不协调性可获解释.To understand the reason of laminated crack in the upsetting of heavy disk-shaped forgings,finite element software was used to simulate the upsetting process of cylinder forgings,and the distribution map of stress state evolution was obtained.The simulation results show that a reasonable explaination of laminated crack defect of heavy disk-shaped forgings could not be obtained from stress state,but from deformation incoordination under tri-lateral compression.

关 键 词：大型饼类锻件 夹层裂纹 有限元 形变梯度 

分 类 号：TG316[金属学及工艺—金属压力加工]