Continuous Casting of TiAlNb Alloys with Different Velocities by Mixing Binary TiAl Ingot and Nb Wire

• Published in: Advanced engineering materials Vol. 19; no. 7
• Main Authors: Fang, Hong‐Ze, Chen, Rui‐Run, Chai, Dong, Yang, Yao‐Hua, Su, Yan‐Qing, Ding, Hong‐Sheng, Guo, Jing‐Jie, Fu, Heng‐Zhi
• Format: Journal Article
• Language: English
• Published: 01.07.2017
• ISSN: 1438-1656; 1527-2648
• DOI: 10.1002/adem.201700058

A method of continuous casting is used and the research investigates microstructure and mechanical properties under different drawing velocity (R, mm/min). The results show that microstructure and composition measurement of different zones are uniform. The smallest grain size is 25.93 μm and formability is good with 0.5R. Compressive strength is higher with 0.5R and maximum value is 1697MPa. Fracture toughness with 0.5R improves about 35.7% which is 21.7MPa·m1/2. The fracture morphology is trans‐lamellar fracture and interface de‐lamination. The method is a feasible way to continuously cast the TiAl‐Nb alloys. The R is an important parameter to add high‐melting‐point element, which affects solidified temperature interval of solidification front and electromagnetic stirring. A method is used to add high‐melting‐point element into TiAl‐based alloy. Microstructure and composition measurement are uniform of liquid phase zone, mushy zone and stability zone with 0.5R. Another image is compressive strength and fracture toughness with different drawing velocity.