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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 5    October 2003

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Laser cladding of titanium alloy coating on titanium aluminide alloy substrate
XU Zi-wen(徐子文), HUANG Zheng(黄 正), RUAN Zhong-jian(阮中健)

School of Materials Science and Engineering,
Beijing University of Aeronautics and Astronautics, Beijing 100083, China

Abstract:A new diffusion bonding technique combined with laser cladding process was developed to join TiAl alloy to itself and Ti-alloys. In order to enhance the weldability of TiAl alloys, Ti-alloy coatings were fabricated by laser cladding on the TiAl alloy. Ti powder and shaped Ti-alloy were respectively used as laser cladding materials. The materials characterization was carried out by OM, SEM, EDS and XRD analysis. The results show that the laser cladding process with shaped Ti-alloy remedy the problems present in the conventional process with powder, such as impurities, cracks and pores. The diffusion bonding of TiAl alloy with Ti-alloy coating to itself and Ti-alloy was carried out with a Gleeble 1500 thermal simulator. The sound bonds of TiAl/TiAl, TiAl/Ti were obtained at a lower temperature and with shorter time.

 

Key words: laser treatment; coating; diffusion bonding; titanium; titanium aluminide alloy

ISSN 1672-7029
CN 43-1423/U

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