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早期的核设施回路管道采用316L不锈钢,在核辐射条件下经过长时间的运行,面临着严重的晶间应力腐蚀隐患,提高核设施耐晶间腐蚀已经成为核电站需要解决的重要问题之一。材料的Cr含量对抵抗晶间应力腐蚀有明显作用,用CO2和Nd∶YAG两种激光熔覆高Cr含量的Inconel 690合金,研究了获得高Cr熔覆层涉及的稀释率控制,激光波长、光束分布、工艺参数对稀释率的影响,熔覆层微观组织和耐腐蚀性能。研究证明,矩形光斑比圆形高斯光斑更容易获得低稀释率的涂层,高Cr含量能获得更好的耐腐蚀性能;Nd∶YAG激光比CO2激光更容易获得高耐腐蚀熔覆层。
In the early stage, the 316L stainless steel was used in the return pipe of nuclear facilities. Under prolonged operation under the condition of nuclear radiation, the pipelines facing serious intergranular stress corrosion risks have become one of the most important problems to be solved in nuclear power plants. The Cr content of the material has a significant effect on the resistance to intergranular stress corrosion. The high Cr content Inconel 690 alloy was coated by CO2 and Nd: YAG laser. The control of dilution rate, laser wavelength, Beam distribution, process parameters on the dilution rate, cladding microstructure and corrosion resistance. The research shows that the rectangular spot is easier to obtain the coating with lower dilution rate than the circular Gaussian spot, and the higher Cr content can get better corrosion resistance. Nd: YAG laser is easier to obtain the high corrosion resistant cladding than the CO2 laser.