超塑变形中硬化规律在多尺度数值模拟中的应用  

Application of the Hardening Law in the Multiscale Simulation for Superplastic Deformation

作　　者：韩晓宁 杨俊宙 吴建军[2] 李金山[1] HAN Xiaoning;YANG Junzhou;WU Jianjun;LI Jinshan(School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an 710072,China;School of Mechanical Engineering,Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]西北工业大学材料学院,陕西西安710072 [2]西北工业大学机电学院,陕西西安710072

出　　处：《铸造技术》2023年第1期75-79,共5页Foundry Technology

基　　金：国家重点研发计划(2021YFB3702603);国家自然科学基金(52174377)。

摘　　要：为了提高TC4超塑成形多尺度仿真数值模拟的有效性,本文针对高温下材料的硬化规律进行了研究。基于材料流变行为的特点,提出了应变硬化和应变软化的表征模型,并将其应用于超塑成形多尺度数值模拟过程中。研究结果表明,本文所采用的应变补偿模型,可用来描述TC4钛合金在超塑变形中的流变行为。此外,对比晶粒尺度、空洞体积分数等微观尺度变量与多尺度物理本构模型的结果可知,所提出的方案对热变形中微观组织演变的数值模拟是有效的。To improve the precision of multiscale numerical simulations for the superplastic formation of TC4 alloys, the hardening law of metal materials at high temperatures was investigated. Based on the flow behavior of high-temperature tensile tests, a simple model considering strain hardening and softening was proposed. Then, the established model was applied to the multiscale numerical simulation of superplastic forming. The results show that the strain compensation model can be employed to describe the flow behavior of TC4 titanium alloy during superplastic deformation. In addition,comparing the simulated results of microscale variables such as grain size and cavity volume fraction with the calculated results of a multiscale physically based constitutive model, it can be concluded that the proposed method could be effective for the numerical simulation of flow stresses and microstructure evolution during hot deformation.

关 键 词：超塑变形 数值模拟 应变补偿 本构模型 钛合金 

分 类 号：TG146.23[一般工业技术—材料科学与工程]