Microstructures and mechanical properties of laser rapid repaired Ti-6A1-4V alloy

Lei Xue, Jing Chen, Xin Lin, Wei Wang, Xiaowei Lu, Weidong Huang

科研成果: 期刊稿件文章同行评审

27 引用 (Scopus)

摘要

Laser rapid forming has been used to repair three kinds of mis-machining defects in Ti-6Al-4V alloy forgings: the milling groove, the milling surface and the milling rib, respectively. There is dense metallurgical bonding between laser repaired zone and forging matrix. The Al and V elements were uniformly distributed without fluctuation and segregation from the matrix to the laser-repaired zone. The laser-repaired zone exhibited the typical Widmanstaten microstructure consisting of prior huge columnar β grains, in which fine acicular α and α+β basket weave were distributed. In the heat affected zone, the microstructure changed from equiaxed grains to Widmanstaten structure gradually. The results of hardness and room temperature tensile test show that the mechanical properties of repaired samples reached the forging standards of HB5224-1982, and hardness of laser-repaired zone is higher than that of the forging matrix, meanwhile, the plasticity is lower than that of the forging matrix. Therefore, the laser-repaired zone and the forging matrix can be treated as a combination of 'strong + weak', corresponding to the different microstructures of laser-repaired zone and the forging matrix, respectively.

源语言英语
页(从-至)989-993
页数5
期刊Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
36
6
出版状态已出版 - 6月 2007

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