Structure and Hardness Changes of Laser Melted TiAl AlloySurface During Continuous Heating
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摘要: 为认识超塑扩散连接机理,研究了γ-TiAl基合金表层激光快速熔凝组织在连续加热过程中的相转变规律及硬度变化.结果表明,在以10℃/min连续加热时,γ-TiAl激光表面快速熔凝组织在750℃左右发生α2→γ相转变,在860℃左右其组织由枝晶组织转变为细小的等轴晶组织,硬度值也出现了相应变化.上述细晶组织为合金的超塑扩散连接提供了良好的基础.Abstract: Structural transformation and hardness variation in the laser melted TiAl intermetallic alloy surface during continuous heating were studied systemically. The results indicated that, during continuous heating from 50 to 1000℃ with a heating rate of 10℃/min, α2→γ phase transformation in the laser melted TiAl intermetallic alloy surface takes place at about 750℃, and the dendritic structure is transformed into fine-grained structure at about 860℃, correspondingly, variations in the hardness of the laser melted TiAl intermetallic alloy surface were also measured. The fine grain structure was considered to be a good basis of superplastic/diffusion bonding.
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Key words:
- micro structure /
- hardness /
- heat treatment /
- laser surface treatment /
- Titanium aluminide
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[1] 林建国, 吴国清, 黄 正.γ-TiAl 基合金超塑扩散连接[J]. 金属学报,2001, 37 (2):221~224 Lin Jianguo,Wu Guoqing,Huang Zheng. Superplastic forming/diffusion bonding of γ-TiAl based alloy [J]. Acta Metallurgica Sinica, 2001,37(2):221~224(in Chinese) [2] Wu G Q, Huang Z. Superplastic forming/diffusion bonding of laser surface melted TiAl intermetallic alloy [J]. Scripta Mat, 2001, 45 (8):895~899 [3] Kim Y-W. Ordered intermetallic alloys, part Ⅲ:gamma titanium aluminides[J]. JOM,1994(7):30~39 [4] Deevi S. Intermetallics for the third millennium[J]. Advanced Materials & Processes, 1999(9):44~47 [5] Tiziant A, Giorddano L, Ramous E. Laser surface treatment by rapid solidification . In:Lasers in Materials Processing-American Society for Metals . OH:Metals Park, 1983. 108~114 -
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