摘要
通过有限元模拟方法,研究了TA15钛合金翼形件锻造过程中应力、应变、温度和变形速率的分布和变化规律,分析了锻造工艺参数对钛合金翼形件坯料变形行为的影响。考虑到大变形过程容易引发动态再结晶,对锻件组织和力学性能有较大影响,在有限元建模过程中嵌入了动态再结晶模型,对锻件热变形过程中的再结晶行为进行模拟分析。结果表明,锻件翼板部分在成形过程中存在热传递和形变产热的共同作用,温度场、应力场分布都比较复杂,但温度分布整体呈现中间高、边缘低的特征。同时,由于变形过程中翼板和短轴部分坯料的变形量较大,变形累积的位错密度较高,因此,在形变产热引起的局部升温作用下,翼板部分组织中动态再结晶现象比较明显。
Based on FEM simulation method,the distributions of stress,strain,temperature and strain rate during forging stage and their regulation were studied,and the influences of technique parameters on deformation behavior of titanium billets were analyzed in the forging process of winglike titanium alloy TA15. Considering the large deformation causing dynamic recrystallization and influence on the microstructure and mechanical properties of alloy,the DRX model was combined in the FEM programs and used to simulate recrystallization behavior during hot forging. The results show that the plate of forging bears the interaction between thermal transmission and heat generation,so the distribution of temperature and stress are very complicated with the feature of higher on the center and lower on the edges. Meanwhile,the large deformation of wing plate and short axis result in high dislocation density. Thus,dynamic recrystallization phenomenon is obvious under the rising of local temperature caused by deformation.
作者
张明杰
黄利军
李恒正
孟瑶
李雪飞
Zhang Mingjie Huang Lijun Li Hengzheng Meng Yao Li Xuefei(AVIC Beijing Institute of Aeronautical Materials, Beijing 100095, China Beijing Xinfeng Mechanical Equipment Company, Beijing 100854, China)
出处
《锻压技术》
CAS
CSCD
北大核心
2016年第11期32-38,共7页
Forging & Stamping Technology
关键词
钛合金TA15
翼形锻件
有限元模拟
锻造工艺
温度场
应力场
titanium alloy TA15
winglike forging workpiece
FEM simulation
forging process
temperature field
stress field
