【摘要】 采用等离子转移弧堆焊技术制备高碳化钨含量的镍基复合材料(Stelcar 65 合金),并通过正交试验优化Stelcar 65合金的堆焊参数。堆焊电流、送粉率和堆焊速度等参数均对碳化钨的分解有显著影响。正交试验优化后的最佳堆焊电流、最佳送粉率和最佳堆焊速度分别为100 A、25 g/min和40 mm/min,堆焊层无裂纹、无分解。并对优化后的堆焊层显微组织和显微硬度进行分析。更多还原

【Abstract】 Ni-based composite coatings with a high content of tungsten carbides (Stelcar 65 composite coatings) were synthesized by plasma transferred arc(PTA) hardfacing. The welding parameters of Stelcar 65 composite coatings were optimized by orthogonal tests. The PTA welding parameters including welding current, powder feed rate and welding speed have significant influence on the tungsten carbide degradation. The values for the optimum welding current, powder feed rate and welding speed were determined to be 100 A, 25 g/min and 40 mm/min, respectively. The produced WC/Ni-based composite coatings were crack-and degradation-free. The microstructure of deposited layers, as well as the microstructure and microhardness of the optimal coating were further analyzed.更多还原