中国激光, 2020, 47 (12): 1202003, 网络出版: 2020-11-27   

硼变质激光熔化沉积TC4的低周疲劳性能 下载: 719次

Low-Cycle Fatigue Performance of Boron-Modified TC4 Deposited by Laser Melting
作者单位
1 西安交通大学机械制造系统工程国家重点实验室, 陕西 西安 710049
2 西安交通大学金属材料强度国家重点实验室, 陕西 西安 710049
摘要
研究了激光熔化沉积硼变质TC4钛合金材料在不同应变幅值下的低周疲劳性能。结果表明,激光熔化沉积硼变质TC4样件在0.8%~1.0%应变幅值下的低周疲劳性能与退火态锻件相当。通过对比分析固溶时效态激光熔化沉积硼变质TC4与退火态TC4锻件的微观组织、低周疲劳性能可以发现,当经受高于1.0%的应变幅值时,固溶时效态激光熔化沉积硼变质TC4的网篮组织比TC4退火态锻件的双态组织具有更好的抵抗裂纹扩展的能力。此外,固溶时效态激光熔化沉积硼变质TC4钛合金在各种应变幅值下均发生了不同程度的循环软化行为。最后采用扫描电镜对固溶时效态激光熔化沉积硼变质TC4钛合金的低周疲劳断口形貌进行了观察,并研究了低周疲劳失效过程中裂纹的扩展过程。
Abstract
This paper investigates the low-cycle fatigue performance of boron-modified TC4 titanium alloy deposited via laser melting at different strain amplitudes. The results reveal that the low-cycle fatigue performance of boron-modified TC4 titanium alloy deposited via laser melting is comparable to that of annealed forging when subjected to a strain amplitude of 0.8%--1.0%. A comparison of the microstructure and low-cycle fatigue performance of the boron-modified laser melting deposited TC4 in solid solution-aging state with the annealed TC4 forging is performed. It is found that as the strain amplitude is above 1.0%, the basket-shaped microstructure of the solid solution-aged boron-modified TC4 titanium alloy deposited via laser melting exhibits better resistance to crack propagation compared with the double phase microstructure of TC4 annealed forgings. Moreover, the solid solution-aged boron-modified TC4 titanium alloy obtained via laser melting deposition exhibits different degrees of cyclic softening behavior at different strain amplitudes. Finally, the morphologies of the low-cycle fatigue fractures of solid solution-aged boron-modified TC4 titanium alloy obtained via laser melting deposition are observed under a scanning electron microscope, and crack propagation during low-cycle fatigue failure is studied here.

霍浩, 张安峰, 齐振佳, 吴梦杰, 王豫跃, 王普强. 硼变质激光熔化沉积TC4的低周疲劳性能[J]. 中国激光, 2020, 47(12): 1202003. Huo Hao, Zhang Anfeng, Qi Zhenjia, Wu Mengjie, Wang Yuyue, Wang Puqiang. Low-Cycle Fatigue Performance of Boron-Modified TC4 Deposited by Laser Melting[J]. Chinese Journal of Lasers, 2020, 47(12): 1202003.

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