采用连续半导体激光器在Q235钢表面制备了Ni-Cr-Mo合金涂层,在不同脉冲电流处理时间下对涂层进行了辅助热处理,提高了涂层的质量及性能,并研究了涂层的显微组织、相组成、力学及耐腐蚀性能。结果表明,脉冲电流处理促进了激光熔覆层表面晶界处共晶组织的析出;随着处理时间的增大,共晶组织的析出量增大,距涂层表面约0.1 mm范围内的硬度也增大,而涂层的耐腐蚀性先增大后减小。

Ni-Cr-Mo alloy coatings are prepared on Q235 steel surface by using a continuous diode laser. The assisted thermal treatments of these coatings are made under pulsed currents with different processing time, which improves the quality and property of coatings. The microstructure, phase composition as well as the mechanical and anticorrosion properties of coatings are investigated. The results show that the pulsed current processing is beneficial to promoting the precipitation of eutectic structures on the grain boundaries of laser cladded coatings. The precipitation amount of eutectic structures increases with the increase of processing time, and the hardness within the depth around 0.1 mm away from the coating surface increases as well, however, the anticorrosion property of coatings increases first and then decreases.