某型氢氧发动机二级叶轮为Ti5Al2.5Sn ELI粉末冶金压制而成, 因加工失误造成多件产品失效。为确保研制进度, 降低损失, 采用激光增材修复技术对二级叶轮超差部位进行修复, 简要介绍了修复方案和修复质量的检测试验。结果表明, 采用激光增材修复技术对Ti5Al2.5Sn ELI材料的修复区域力学性能不低于粉末冶金制备的材料基体, 此项技术为氢氧发动机关键零部件问题解决开创了新的途径。

The secondary impeller for a certain type of hydrogen engine is pressed with Ti5A12.5Sn ELI powder and pieces of product failure are caused by the machining errors. In order to ensure the development progress and reduce loss, the laser additive repair technology is used to repair out-of-tolerance parts of the secondary impeller. This paper briefly introduces the repair scheme and repair quality test, and the results show that by using the laser additive repair technology, the mechanical properties of Ti5A12.5Sn ELI repair area is not lower than the powder metallurgy material base, and this technology create a new way to solve problems of key part in hydrogen engine.