Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 27, Issue 12, Pages 2613-2621Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(17)60289-9
Keywords
laser additive repair; Ti17 titanium alloy; microstructure; mechanical properties; deformation behavior
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Funding
- National Key Technologies R&D Program, China [2016YFB11000100]
- Research Fund of the State Key Laboratory of Solidification Processing (NWPU), China [KP201611]
- National Natural Science Foundation of China [51475380]
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Laser additive manufacturing technology with powder feeding was employed to repair wrought Ti17 titanium alloy with small surface defects. The microstructure, micro-hardness and room temperature tensile properties of laser additive repaired (LARed) specimen were investigated. The results show that, cellular substructures are observed in the laser deposited zone (LDZ), rather than the typical alpha laths morphology due to lack of enough subsequent thermal cycles. The cellular substructures lead to lower micro-hardness in the LDZ compared with the wrought substrate zone which consists of duplex microstructure. The tensile test results indicate that the tensile deformation process of the LARed specimen exhibits a characteristic of dramatic plastic strain heterogeneity and fracture in the laser repaired zone with a mixed dimple and cleavage mode. The tensile strength of the LARed specimen is slightly higher than that of the wrought specimen and the elongation of 11.7% is lower.
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