Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 20, Issue 11, Pages 2192-2197Publisher
ELSEVIER
DOI: 10.1016/S1003-6326(09)60441-6
Keywords
TC4 Ti alloy; TiC; laser cladding; segregation; hardness
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Funding
- Shanghai Education Commission, China [J51402]
- Foundation for Excellent Youth Scholar of China [gjd08004]
- Shanghai Science and Technology Development Foundation, China [08QA14035]
- Special Foundation of Shanghai Education Commission for Nano-Materials Research, China [0852nm01400]
- Shanghai Science and Technology Commission, China [08520513400]
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Laser surface cladding was applied on a TC4 Ti alloy to improve its surface properties. Mixed TiC and Ti powders with a TiC-to-Ti mass ratio of 1:3 were put onto the TC4 Ti alloy and subsequently treated by laser beam. The microstructure and composition modifications in the surface layer were carefully investigated by using SEM, EDX and XRD. Due to melting, liquid state mixing followed by rapid solidification and cooling, a layer with graded microstructures and compositions formed. The TiC powders were completely dissolved into the melted layer during melting and segregated as fine dendrites when solidified. The inter-dendritic areas were filled with fine alpha' phase lamellae enrich in Al. Mainly due to the reduced TiC volume fraction with increasing depth, the hardness decreases with increasing depth in the laser clad layer with a maximum value of HV1400, about 4.5 times of the initial one.
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