蠕变预加载Ti6321钛合金的动态力学性能和绝热剪切研究
Dynamic Mechanical Properties and Adiabatic Shear of Ti6321 Titanium Alloy Under Creep Preloading
向霁旸 1宋雨宸 2王琳 3许玲玉 4闫志维 2李严星 2程兴旺5
作者信息
- 1. 北京理工大学机电学院,北京 100081
- 2. 北京理工大学材料学院,北京 100081
- 3. 北京理工大学材料学院,北京 100081;北京理工大学冲击环境材料技术国家级重点实验室,北京 100081;北京理工大学爆炸科学与技术国家重点实验室,北京 100081
- 4. 洛阳船舶材料研究所,河南洛阳 471023
- 5. 北京理工大学材料学院,北京 100081;北京理工大学冲击环境材料技术国家级重点实验室,北京 100081;北京理工大学唐山研究院,河北唐山 063000
- 折叠
摘要
蠕变加载对结构件的服役性能会产生一定的影响.本研究对等轴、双态、魏氏组织Ti6321钛合金进行蠕变预加载,对蠕变后的材料进行动态压缩试验,应变率为3000 s-1,研究经不同蠕变应力加载后的Ti6321钛合金动态力学行为.结果表明:蠕变后钛合金的动态力学性能均表现出屈服温度下降,抗压强度上升.随蠕变应力增加,3种组织钛合金在动态压缩后的冲击吸收功增大,绝热剪切敏感性降低.未蠕变的钛合金经动态压缩后均产生相变带,等轴组织和双态组织钛合金蠕变预加载再经动态压缩后未失效,仅产生形变带,魏氏组织产生相变带导致失效.蠕变推迟了等轴组织和双态组织钛合金的绝热剪切相变的发生.
Abstract
Creep loading has a certain effect on the service performance of structural components.In this research,the creep preloading on Ti6321 titanium alloy with equiaxed,bimodal and Widmanstatten microstructures was carried out.Dynamic compression tests of the materials after creep were conducted at a strain rate of 3000 s-1.The dynamic behavior of Ti6321 titanium alloy after different creep stress loadings was studied.The results show that the yield strength decreases and the compressive strength increases after creep preloading.With the increase in creep stress,the impact absorption energy of titanium alloy of three microstructures after dynamic compression increases and the adiabatic shear sensitivity decreases.Titanium alloys without creep have phase transition bands after dynamic compression,and the titanium alloys with equiaxed microstructure and bimodal microstructure after dynamic compression followed by creep preloading do not fail but only produce deformation band.Titanium alloy with Widmanstatten microstructure fails due to phase transition bands.The adiabatic shear of titanium alloys with equiaxed and bimodal microstructures is delayed by creep.
关键词
Ti6321钛合金/蠕变/动态压缩/冲击吸收功/绝热剪切Key words
Ti6321 alloy/creep/dynamic compression/impact absorption energy/adiabatic shear引用本文复制引用
出版年
2024
NETL
NSTL
万方数据