材料科学
流动应力
热加工
变形(气象学)
热等静压
应变率
锻造
软化
加工硬化
微观结构
冶金
动态再结晶
复合材料
金属间化合物
本构方程
硬化(计算)
合金
有限元法
结构工程
图层(电子)
工程类
作者
Meiling Li,Wenjin Gao,Yinghao Zhou
标识
DOI:10.1088/2053-1591/ac487e
摘要
Abstract The 60NiTi (Ni60wt%–Ti40wt%) intermetallic is a hard-to-process material. Understanding of hot deformation behavior is crucial for the hot working of 60NiTi. This work studied hot deformation behavior and corresponding microstructure of the hot isostatic pressed 60NiTi in the temperature range of 900 °C–1050 °C and at strain rates of 0.1, 0.01 and 0.001 s −1 through a hot compression test. The flow stress and microstructure were susceptible to the hot deformation parameters. The flow stress decreased with the increase in deformation temperature and decrease in strain rate. Work hardening occurred at a small strain, then followed by softening; finally, near-dynamic equilibrium was achieved between work hardening and softening. A constitutive equation was developed to describe the effects of strain rate and temperature on flow stress. Simulation of hot deformation via the finite element method revealed the workpiece’s inhomogeneous deformation. The deformation occurred mainly in the center area of the cylindrical sample, resulting in high stress and strain concentrations in this region and causing the equiaxial grains to be compressed into prolate grains. This work can provide guidance for the hot working, such as forging and hot rolling, of 60NiTi.
科研通智能强力驱动
Strongly Powered by AbleSci AI