两步等温锻造内燃机用TC21钛合金力学性能分析
Mechanical properties analysis of TC21 titanium alloy for two step isothermal forging internal combustion engine
陈莉1
作者信息
- 1. 新乡职业技术学院 现代设计与工程学院,河南 新乡 453000
- 折叠
摘要
为了提高内燃机用TC21钛合金的结构性能,经多向等温锻造使原先铸态TC21钛合金内大尺寸片层组织变成了大量细小等轴组织,分析了马氏体TC21钛合金经过多向等温锻造后力学性能.研究结果表明:等温锻造坯料基体内存在许多尺寸接近的等轴晶,形成了由等轴晶构成的均匀坯料组织.对铸态TC21钛合金完成等温锻造可以显著提高其力学强度,屈服强度由731MPa增大到910MPa,拉伸强度由740MPa增大到950MPa,断裂伸长率由5％增大到16.8％.通过适当处理工艺形成马氏体组织来实现TC21钛合金的细晶强化效果.
Abstract
In order to improve the structural properties of TC21 titanium alloy for internal combustion engine, the as-cast TC21 titanium alloy was treated by β phase zone heat treatment process. After multi-direction isothermal forging, the large size lamellar structure of as-cast TC21 titanium alloy was changed into a large number of fine equiaxed structures. The grain refinement effect and microstructure changes of martensitic TC21 titanium alloy formed by multi-direction isothermal forging were analyzed. The results show that there are many equiaxed crystals with similar size in the matrix of isothermal forging billet, forming equiaxed crys-tal structure and realizing fine grain strengthening. Martensite microstructure can significantly improve the re-fining effect of TC21 titanium alloy, obtain faster conversion efficiency, and achieve ideal uniformity of mi-crostructure. The mechanical strength of as-cast TC21 titanium alloy increased significantly after isothermal forging, and the yield strength increased from 731MPa to 910MPa, the tensile strength increased from 740MPa to 950MPa, and the elongation at break increased from 5％ to 16.8％. The fine hardening effect of TC21 titanium alloy was achieved by forming martensite structure with appropriate processing technology.
关键词
多向等温锻造/TC21钛合金/马氏体/晶粒细化/力学性能Key words
Multidirectional isothermal forging/TC21 titanium alloy/Martensite/Grain refinement/Mechanical property引用本文复制引用
出版年
2024
NETL
NSTL
万方数据