扩散焊后TC4钛合金热变形行为及焊接界面孔洞演变
Thermal deformation behavior and holes evolution at weld interface of diffusion bonded TC4 titanium alloy
吴腾飞 1范荣磊 1马广璐 2董佳鹏 2武永1
作者信息
- 1. 南京航空航天大学机电学院,江苏南京 210016
- 2. 中国航发沈阳黎明航空发动机有限责任公司,辽宁沈阳 110043
- 折叠
摘要
利用UTM5504X型电子万能试验机对扩散焊后TC4钛合金进行恒应变速率拉伸实验,研究材料在变形温度680～920 ℃、应变速率0.0001～0.1 s-1条件下的热变形行为.通过光学显微镜分析了扩散焊后TC4钛合金和原始态TC4钛合金金相组织的差异,并研究了不同变形参数对焊接界面孔洞的影响.结果表明:与原始态TC4钛合金相比,扩散焊后TC4钛合金中针状α相发生了明显粗化.随着变形温度的上升和应变速率的下降,峰值应力逐渐减小.在变形温度680～800 ℃、应变速率0.0001～0.01 s-1范围内,扩散焊后TC4钛合金趋于沿焊接界面断裂;当变形温度为920 ℃、应变速率为0.0001 s-1时,扩散焊后TC4钛合金沿焊接界面断裂,伸长率为237.1％.当真应变保持恒定时,焊接界面的孔洞占比随着变形温度的上升和应变速率的下降逐渐减小.
Abstract
The constant strain rate tensile tests of diffusion bonded TC4 titanium alloy were conducted on UTM5504X electronic universal testing machine to study the thermal deformation behaviors of the material at the deformation temperature of 680-920 ℃ and the strain rate of 0.0001-0.1s1.The difference of microstructure between the diffusion bonded TC4 titanium alloy and original TC4 titanium alloy was analyzed by optical microscope,and the effect of different deformation parameters on the holes of weld interface was studied.The results show that the acicular α phase in the diffusion bonded TC4 titanium alloy is obviously coarsened compared with original TC4 titanium al-loy.With the increase of deformation temperature and the decrease of strain rate,the peak stress gradually decreases.At deformation tem-perature of 680-800 ℃ and strain rate of 0.0001-0.01 s-1,diffusion bonded TC4 titanium alloy tends to fracture along the weld inter-face.When the deformation temperature is 920 ℃ and the strain rate is 0.0001 s-1,diffusion bonded TC4 titanium alloy fractures along the weld interface,and the elongation is 237.1％.When the true strain is constant,the proportion of holes at the weld interface decreases with the increase of deformation temperature and the decrease of strain rate.
关键词
扩散焊/TC4钛合金/热变形行为/峰值应力/焊接界面Key words
diffusion bonding/TC4 titanium alloy/thermal deformation behavior/peak stress/weld interface引用本文复制引用
基金项目
国家自然科学基金资助项目(51805256)
中国博士后科学基金资助项目(2020M670792)
出版年
2024
NETL
NSTL
万方数据