Because of excellent creep resistances and fatigue properties both in medium and high temperature, the di-rectionally solidified superalloy DZ125 alloy has been widely used as turbine blades and guide vanes in engineering. In this paper, the repairing process of DZ125 alloy was discussed. The results showed that there were many HAZ cracks formed by using common welding materials. Then a kind of now welding alloy was developed and after proper welding and heat treat-ments no cracks were found in the joints. The microstructures of the joints were also homogeneous and the tensile strengths of the joints were 90% of that of DZ125 alloy.%DZ125合金具有良好的中温、高温综合性能和优异的疲劳性能,被广泛用于燃气轮机工作叶片和导向叶片.针对零件实际使用过程中出现的使役缺陷等问题,介绍了采用钨极氩弧焊(TIG)的方法焊接修复DZ125合金的研究进展.研究结果表明,采用传统焊接材料修复后,热影响区碳化物等位置易于产生热裂纹,焊缝硬度较低.针对上述试验结果,设计开发了一种新型焊接材料,采用此新型焊接材料和恰当的焊接与热处理工艺,可有效避免热影响区裂纹产生,接头微观组织较均匀,1000℃拉伸强度达到母材90%,可以满足DZ125合金使用要求.
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