K417G合金焊接修复用高温合金粉末设计与工艺
Study on powder metallurgy repair technology for K417G alloy
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摘要: 航空发动机涡轮导向叶片在服役过程中形成的裂纹可以采用钎焊粉末冶金修复技术进行修复，针对低压涡轮导向叶片材料和结构特点，设计了K417G合金修复所需的不同成分的粉末填充材料，测试了不同粉末粒度配比的振实密度值，采用金相法、压汞法评估了不同烧结条件下粉末烧结体的孔隙率、平均孔径、中值孔径、最可几孔径等烧结体性能值，优选了粉末填充材料，在此基础上开展了钎焊粉末冶金修复工艺研究，分析测试了钎焊粉末冶金修复接头冶金组织. 结果表明,接头成形良好，焊料润湿铺展充分，接头致密饱满，无明显焊接缺陷.Abstract: The crack in the turbine vanes of the aircraft engine generated during service can be repaired by powder metallurgy repair technology. The filler powders with different compositions and sizes were designed aiming at the material and structure of the low press turbine vanes of K417G alloy to be repaired. Tap density of powders with different mesh sizes and mixture ratios were tested. The performance values of sintered samples, such as porosity, mean pore diameter, median pore diameter, mode pore diameter were obtained by metallographic examination and mercury porosimetry. The optimal filler powders were determined by using the above investigations. The microstructure and performance of powder metallurgy repair joints were analyzed. The results showed that the specimen were repaired well and there was no defect in the joint.
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Keywords:
- K417G alloy /
- repair /
- powder /
- design /
- technique
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