Evolution of Oxygen-Rich Layer and Its Effect on Fatigue Property of Ti-6Al-4V
LIU Yunxi1,2,3, CHEN Wei1, LIU Jie4, LI Zhiqiang1,2,3, YAO Gang1, HAN Xiuquan1,2,3
(1. AVIC Manufacturing Technology Institute, Beijing 100024, China;
2. Aeronautical Key Laboratory for Plastic Forming Technologies, Beijing 100024, China;
3. Beijing Key Laboratory of Digital Plasticity Forming Technology and Equipment, Beijing 100024, China;
4. The Military Representative of PLA Air Force in North China, Beijing 100013, China)
The microstructure and microhardness of Ti-6Al-4V α-case which experiences thermal exposure at 900℃ , 930℃ and 960℃ are investigated. After thermal exposure of 0.5-24h, the volume fraction of α is much higher in α-case than in sample interior, and the grains grow larger comparing with the original material. The α-case thickness increases with time and temperature increasing. Due to the strengthening effect of oxygen, the microhardness of α-case thickness also increases. The microhardness value decreases from the surface to the interior of the sample, and it becomes stable below 200μm. The α-case on the fatigue sample induces a multi-site fatigue crack initiation mode, which leads to a significant deterioration of fatigue life.
刘运玺1,2,3，陈玮1，刘 杰4，李志强1,2,3，姚 罡1，韩秀全1,2,3. Ti-6Al-4V 富氧层生长规律及对疲劳性能的影响[J]. 航空制造技术, 2018, 61(11): 74-78.
LIU Yunxi1,2,3, CHEN Wei1, LIU Jie4, LI Zhiqiang1,2,3, YAO Gang1, HAN Xiuquan1,2,3. Evolution of Oxygen-Rich Layer and Its Effect on Fatigue Property of Ti-6Al-4V. Aeronautical Manufacturing Technology, 2018, 61(11): 74-78.
2018, 
