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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2014, Vol. 35 ›› Issue (10): 2881-2888.doi: 10.7527/S1000-6893.2014.0142

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Surface Vitrification of a Corrosion-resistant Fe-Cr-Mo-C-B Alloy by Laser Surface Treatment and Its Effect on Microstructure and Properties

ZHANG Qi, SUN Lulu, PANG Shujie, ZHANG Tao   

  1. School of Materials Science and Engineering, Beihang University, Beijing 100191, China
  • Received:2014-04-23 Revised:2014-07-07 Online:2014-10-25 Published:2014-07-11
  • Supported by:

    National Natural Science Foundation of China (51271008)

Abstract:

Iron-based Fe-Cr-Mo-C-B metallic glasses with high corrosion resistance and hardness are suitable to be used as surface and coating materials, and their high glassy-forming ability makes it possible to synthesize amorphous surface layer by laser surface treatment. In this paper, surface vitrification of a Fe-Cr-Mo-C-B alloy was successfully achieved by laser surface melting. The effect of laser surface melting parameters on the surface vitrification was studied, and the optimum process was established for the Fe-Cr-Mo-C-B alloy. It was found that after the LSM treatment, multilayer structure consisting of amorphous layer, amorphous-crystalline layer and crystalline substrate from alloy surface to substrate was formed, and the mechanism was discussed. Investigations on corrosion behavior and hardness of the laser surface treated Fe-Cr-Mo-C-B alloy indicate that these properties significantly depend on the microstructure, and the amorphous surface layer exhibits high hardness and outstanding corrosion resistance. This study also provides theoretical and experimental foundation for preparing corrosion-and wear-resistant Fe-Cr-Mo-C-B amorphous coating on other metallic materials using laser surface cladding technology.

Key words: metallic glass, laser surface treatment, microstructure, corrosion, hardness

CLC Number: