大型饼类锻件镦粗夹层裂纹缺陷形成机理研究  

STUDY ON MECHANISM OF LAMINATED CRACK DEFECT IN THE UPSETTING PROCESS OF HEAVY DISK-SHAPED FORGINGS

作　　者：李学通[1] 张沛 王敏婷[1] 杜凤山[1] 

机构地区：[1]燕山大学机械工程学院,国家冷轧板带装备及工艺工程技术研究中心,秦皇岛066004 [2]郑州宇通重工有限公司,郑州450051

出　　处：《固体力学学报》2012年第3期273-278,共6页Chinese Journal of Solid Mechanics

基　　金："十一五"国家科技支撑计划(2007BAF02B12);国家自然科学基金项目(51075352);河北省自然科学基金(E2011203090)资助

摘　　要：针对大型饼类锻件镦粗过程出现的夹层裂纹缺陷问题,采用有限元技术,建立锻件镦粗过程的热力耦合理论分析模型,计算了镦粗过程中等效应变、等效应变速率及其对应梯度的演变规律.通过对各场变量演变分布的分析,提出了基于变形程度与变形速度梯度组合式的夹层缺陷判断模型,并获得了锻件心部夹层裂纹的形貌和分布.通过对比计算结果与实验测试数据,二者吻合良好.Aiming to laminated crack defect in the upsetting of heavy disk-shaped forgings,a thermo mechanically coupled finite element model for the upsetting process is established. Then the distributions of equivalent strain, equivalent strain rate and its＇ gradients within the heavy disk-shaped forgings are computationally obtained. A laminated crack defect model based on strain and strain rate gradient is proposed;and then the morphology distribution of laminated crack at the center of forgings is solved, showing a good agreement with the experimental data.

关 键 词：大型饼类锻件 镦粗 夹层裂纹缺陷 有限元 

分 类 号：TG316[金属学及工艺—金属压力加工]