TY - JOUR
T1 - Microstructures and mechanical properties of laser rapid repaired Ti-6A1-4V alloy
AU - Xue, Lei
AU - Chen, Jing
AU - Lin, Xin
AU - Wang, Wei
AU - Lu, Xiaowei
AU - Huang, Weidong
PY - 2007/6
Y1 - 2007/6
N2 - 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.
AB - 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.
KW - Laser rapid repairing
KW - Mechanical properties
KW - Microstructure
KW - Ti-6Al-4V alloy
UR - http://www.scopus.com/inward/record.url?scp=34547802773&partnerID=8YFLogxK
M3 - 文章
AN - SCOPUS:34547802773
SN - 1002-185X
VL - 36
SP - 989
EP - 993
JO - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
JF - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
IS - 6
ER -