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变形量对锻造Ti-6Al-4V组织、织构和力学性能的影响
Effect of Deformation Reduction on the Microstructure, Texture and Mechanical Properties of Forged Ti-6Al-4V
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- DOI:
- 作者:
- 黄 磊，陈逸维，刘华秋，李芳玲
HUANG Lei, CHEN Yiwei, LIU Huaqiu, LI Fangling
- 作者单位:
- 季华实验室 新型增材制造研究院，广东 佛山 528000
Advanced Additive Manufacturing of Jihua Laboratory, Foshan 528000, China
- 关键词:
- Ti-6Al-4V；退火；力学性能；球状初生 α
Ti-6Al-4V; anneal; mechanical properties; globular primary α
- 摘要:
- 常用锻造 Ti-6Al-4V 的微观结构主要有等轴、层状和双峰结构，这些结构与对应的晶粒尺寸分布等微观组
织特征对 Ti-6Al-4V 的拉伸和疲劳等力学性能有着主要影响。 然而在实际加工条件(如非等温条件，非恒定应变率)下，
对微观组织与力学性能之间关联性的研究较少。 基于此，本文研究了在锻造实验中，理论变形量对 Ti-6Al-4V 的显微结
构、拉伸和疲劳性能的影响。 起始材料由等轴和层状 α 相组成。 在进一步的变形和退火中，随理论变形量从 10% 增加到
50%，球状初生 α 相的体积分数增加了约 20%，抗拉强度和屈服强度增加了约 50 MPa，伸长率保持不变。 这归因于球状
α 相体积分数的增加和 α 相基面取向与外加拉伸载荷方向之间夹角的角度减小。 疲劳强度也随理论变形量的增加而增
加。 根 据 Ti-6Al-4V 锻造和退火后球状初生 α 的体积分数增加对双峰显微组织的影响，讨论了这些观察结果的重要性.
The microstructure of commonly used forged Ti-6Al-4V mainly includes equiaxed, lamellar and bimodal structures. These structures and corresponding microstructure characteristics, such as grain size distribution, have a major impact on the tensile and fatigue properties of Ti-6Al-4V. However, there are few studies on the correlation between microstructure and mechanical properties under actual processing conditions(e.g., nonisothermal conditions and nonconstant strain rates). Based on this, the effect of nominal reduction during forging on the microstructures, tensile and fatigue properties of Ti-6Al-4V has been investigated in this paper. The microstructure of the initial material is a combination of equiaxed and lamellar α phases. With further deformation and annealing, the volume fraction of globular primary α increases by approximately 20% as the nominal reduction increases from 10% to 50%. More notably, the ultimate tensile strength and yield strength increase by ~50 MPa with the ductility remaining constant, which is attributed to the increase in the globular α phase volume fraction and decreasing alignment of the α phase basal planes with the tensile direction. The fatigue strength also increases with more nominal reductions. The significance of these observations is discussed in terms of the effect of an increased volume fraction of globular primary α on the bimodal microstructure after forging and annealing in Ti-6Al-4V