K403合金连续CO2激光熔覆层质量控制
Quality Controlling of Laser Cladding Layer on K403 Superalloy by Continuous Wave CO2 Laser
张乔斌1, 熊 征1, 曾晓雁2
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作者单位：1. 海军工程大学 科研部, 湖北 武汉 430033; 2. 华中科技大学 武汉国家光电实验室, 湖北 武汉 430074
中文关键字：激光熔覆； 线能量； K403合金； 裂纹
英文关键字：laser cladding; line energy; K403 superalloy; cracking
中文摘要：在K403高温合金的基体上，采用连续CO2激光器熔覆商用司太立合金，分析了激光熔覆层的组织特征和熔覆层熔合质量。结果表明，熔覆层组织由柱状树枝晶和细小等轴晶等构成；良好的熔覆质量与激光熔覆线能量有关，当线能量为200～320 J/mm时可以获得熔合界面良好，无裂纹的熔覆层；熔覆层裂纹与K403合金中沿晶分布的低熔点共晶及碳化物有关。
英文摘要：Laser cladding process of K403 superalloy with a commercial manual stallite alloy was conducted by continuous wave (CW) CO2 laser. The microstructure and melting quality of the cladding layer were analyzed. The results show that the microstructure of the cladding consists of columnar branch grain and fine equiaxed grain. A good cladding quality without cracking and unmelted boundary is obtained when line energy is 200～320 J/mm. The eutectic phase with low melting point and carbide existed along the grain boundary of K403 superalloy is the main factors causing the cladding cracking.