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| Study of Columnar Microstructure Coating of Titanium Alloy Prepared by Pulse Laser Cladding |
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Cite this article:
;. Study of Columnar Microstructure Coating of Titanium Alloy Prepared by Pulse Laser Cladding. Chin J Mater Res, 2008, 22(3): 322-322.
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Abstract A TC6 titanium alloy coating with columnar microstructure was prepared on the substrate of TC6 titanium alloy by pulse laser cladding successfully and studied by SEM, XRD and EPMA. The results showed that, the microstructure of the coating showed a typical columnar characteristic. The coating was still composed of α′ martensite which was finer than that of conventional heat treatment or welding. The distributions of main alloying elements were more homogeneous in columnar structure than in substrate. With the solidification theory and calculated results of temperature gradient (G) and solidification velocity (R) at the solidification interface, the formation of columnar structure was studied. The columnar structure was formed in the transition of “liquid phase→ β phase” and determined by G/R ratio at the solidification interface. In cooling process, the morphology of columnar β-phase was retained. With the variety of G/R ratio at the solidification interface, the morphology of the columnar structure varied and finally transformed to other structures.
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Received: 15 October 2007
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