锻压技术

摩擦对高压扭转IF钢试样不均匀变形特征的影响

英文标题：Influence of friction on heterogeneous plastic deformation for high

分类号：TG302

出版年,卷(期):页码：2018,43(11):127-131

摘要：

采用有限元软件DEFORM-3D，对无间隙原子钢试样的高压扭转过程进行了模拟仿真，研究了摩擦对高压扭转试样塑性变形特征的影响。模拟结果表明：试样与模具间的摩擦因数对高压扭转试样塑性变形过程的影响较大，直接影响试样的塑性变形程度；试样飞边会随着摩擦的增加而变短；在压缩阶段，摩擦将阻碍试样的塑性变形，导致显著的不均匀塑性变形特征；在扭转阶段，摩擦促进试样的塑性变形，摩擦因数越大，试样的不均匀塑性变形越大。同时，高压扭转过程中试样边缘出现大塑性变形和飞边，随着摩擦系数的增加，大塑性变形区域逐渐向试样心部靠拢，试样飞边长度逐渐变短，高压扭转试样硬度分布的测试结果与模拟结果一致。

The high-pressure torsion (HPT) process of interstitial-free steel specimen was simulated by finite analysis software DEFORM-3D, and the influences of friction on heterogeneous plastic deformation of HPT specimen were investigated. The results indicated that the friction factor between specimen and mould plays an important role on the heterogeneous plastic deformation and influences the degree of plastic deformation directly. However, the fin length of HPT specimen decreases with the increase of fiction. In addition, the friction impedes the plastic deformation in the compression stage resulting in significant heterogeneous plastic deformation characteristics, the friction remarkably promotes plastic deformation in the torsion stage, and the larger the fiction factor is, the greater the uneven plastic deformation of specimen is. At the same time, severe plastic deformation and fin occur at the edge of specimen in the HPT process. With the increase of fiction factor, the area of severe plastic deformation gradually approaches the core of specimen, and the fin length of specimen becomes shorter gradually. At last, the test results of the hardness distribution of the HPT specimen are consistent with the simulation results.

基金项目：

国家十三五智能农机装备重点研发计划资助项目(2016YFD0701701，2018YFD0700604)；山东省现代农业产业技术体系果品产业创新团队资金资助项目(SDAIT-06-12，SDAIT-06-1)；山东农业大学“双一流”科技创新团队专项资助项目(SYL2017XTTD07)；山东省重大科技创新工程项目（2018CXGC0209）

张紫涵（1994-），女，硕士研究生,E-mail：zpurpleh@163.com;通讯作者：宋月鹏（1971-），男，博士，教授,E-mail：uptonsong@163.com

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