As the pulse current is effective on deep crack healing and laser had more advantage in shallow crack healing, so the combined treatment of pulse current and laser is applied to deep crack in titanium alloy. During the treatment of pulse current, high temperature and local compressive stress are generated on crack tip under the detour effect. Some healing areas appear after pulse current treatment, the electron microprobe tests results show the distribution of element in healing areas is uniform and the electron microprobe analysis shows the microstructure is mainly fine acicular martensite. The healing effect of deep crack is obvious after the combined treatment. Laser remelting makes the upper crack healing and results in the formation of remelting zone-heat affect zone-matrix structure. At the position near remelting zone, the healing areas formed by the pulse current show a significant columnar crystal structure.
DENG Dewei
,
YU Tao
,
ZHANG Lin
,
YANG Shuhua
,
ZHANG Hongchao
. Effect of Healing on Microstructure by the Combined Treatment of Pulse Current and Laser Applied to Deep Crack in Titanium Alloy[J]. Journal of Mechanical Engineering, 2017
, 53(20)
: 38
-44
.
DOI: 10.3901/JME.2017.20.038
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