Co基高温合金失效分析及TIG堆焊工艺优化

Failure Analysis of Co-based High Temperature Alloy and Optimization of TIG Surfacing Process

为了缓解煤化工领域纯氧燃烧器热端部件(外喷头)易发生端面龟裂失效的问题,研究了外喷头表面失效材料的显微组织和物相成分,总结了不同损坏形式下的失效原因。在此基础上,采用钨极氩弧焊在同种基体材料上堆焊UMCo50合金,基于多因素正交实验的极差分析法进行了堆焊工艺的优化。结果显示:堆焊最优工艺参数为焊接电流120 A,堆焊速度10~11 cm/min,层间温度(60±10)℃,堆焊层2~3层。最优工艺在实际生产中得到了验证,为热端部件的堆焊修复工艺优化提供理论了参考和技术保障。

In order to alleviate the problem of end face cracking and failure of pure oxygen burner hot part-outer nozzle in coal chemical industry, the microstructure and phase composition of the failed material on outer nozzle surface were studied,and the failure reasons of different damage forms were summarized. Base on this, UMCo50 alloy was overlaid on the same base material by TIG welding. Based on the range analysis method of multi-factor orthogonal experiment, the surfacing process was optimized. The results show that the optimal surfacing process parameters are welding current of 120 A, surfacing speed of 10-11 cm/min, interlayer temperature of(60±10)℃, and surfacing layer number of 2-3. The optimal process has been experimentally verified in actual production, providing theoretical reference and technical support for the optimization of hot parts’ surfacing repair process.