Chinese Optics Letters, 2011, 9 (7): 071402, Published Online: May. 18, 2011
Microstructure characteristics of laser forming repaired Ti60 alloy 
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激光成形修复 Ti60 组织 析出相 140.3390 Laser materials processing 160.3900 Metals 350.3390 Laser materials processing
Abstract
The microstructure characteristics of laser forming repaired (LFR) Ti60 (Ti-5.6Al-4.8Sn-2Zr-1Mo-0.35Si-0.3Nb) as-deposited and annealed samples are analyzed. The microstructure of as-deposited repaired zone (RZ) consists of epitaxial columnar prior \beta grains, in which fine woven \alpha laths and \beta-phase between \alpha laths exist. The heat-affected zone (HAZ) experiences a continuous microstructural transition from duplex microstructure of the base metal zone (BMZ) to the microstructure of RZ. The presence of silicide precipitates is observed in both RZ and BMZ in an annealed sample by transmission electron microscopy. They are identified as (Ti, Zr)6Si3 distributed mainly at the \alpha/\beta interface with the size of 100-300 nm. The fine \alpha2 precipitates are detected in BMZ by electron diffraction; there was no \alpha2 detected in RZ.
Yanhong Liu, Jing Chen, Qiang Zhang, Lei Xue, Xin Lin, Weidong Huang. Microstructure characteristics of laser forming repaired Ti60 alloy[J]. Chinese Optics Letters, 2011, 9(7): 071402.
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