Study on Shrinkage Ratio of Cast High Nb-TiAl Alloy Based on Orthogonal Test
LIU Jinhu1, DING Xianfei1,2,3, FENG Xin1,2,3, NAN Hai1,2,3
1. Cast Titanium Alloy R&D Center, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. BAIMTEC Material Co., Ltd, Beijing 100094, China;
3. Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology, Beijing 100095, China
The effects of geometric shape, resisted shrinkage and free shrinkage, sample size on the linear shrinkage ratio of two high Nb-TiAl alloy investment castings were investigated by orthogonal test. The results show that the average linear shrinkage ratio of Ti–45Al–8Nb is 2.12%–3.28%, and the average linear shrinkage ratio of Ti–48Al–7.5Nb is 2.55%–3.39%, and the linear shrinkage ratio of the latter is larger. The linear shrinkage ratio of the resisted shrinkage specimen in the unblocked direction is 44.8%–47.7% higher than that of the free shrinkage specimen. The geometry and size have little effect on the linear shrinkage ratio, and resistance to solidification shrinkage has a greater impact on linear shrinkage ratio. As the sample size increases, the linear shrinkage increases by 100%, but the linear shrinkage ratio gradually decreases to 20%.
刘金虎，丁贤飞，冯新，南海. 基于正交试验的铸造高Nb-TiAl合金收缩率研究[J]. 航空制造技术, 2019, 62(21): 72-78.
LIU Jinhu, DING Xianfei, FENG Xin, NAN Hai. Study on Shrinkage Ratio of Cast High Nb-TiAl Alloy Based on Orthogonal Test. Aeronautical Manufacturing Technology, 2019, 62(21): 72-78.
2019, 
