激光直接制造工艺对Ni合金成形的影响

选用Ni60合金粉末材料进行了简单零件的激光直接成形试验,借助金相分析、扫描电子显微分析,研究了不同加工工艺对其成形的影响。结果表明:零件成形的宏观质量与单道熔覆层厚度关系密切,在激光功率1100W、激光扫描速度2～3mm/s、送粉量70～100mg/s条件下可获得外观光滑的零件;在送粉量一定的情况下,成形过程熔覆层的高度波动与零件形状有关,可以通过调节扫描速度来改善其高低不平的程度;克服制造缺陷的方法是注意基体的预热和成形零件的缓冷处理,激光功率和扫描速度需要在加工过程中适当调节。

Influence of Laser Direct Manufacture Process on Ni Alloy Forming

A series of laser direct forming experiments were carried out choosing Ni60 alloy powedr on the simple parts.The effects of different working processes on the parts forming was investigated by means of TEM and SEM.The results show that there is close relation between surfacing complex quality of the forming parts and the cladding height. Under the conditions of the laser power 1100W, the scanning velocity 2-3mm/s, the rate of powder feeding 70-100mg/s, the superficial smooth parts can be obtained. When the powder feed rate is in a certain value, the height fluctuation of multi-laser cladding is relative to the part shape. Adjusting the scanning velocity properly, the fluctuation of cladding layers can be improved. The methods of preventing the defects are the preheat of the base and the slow clod treatmeat of the forming parts .The laser power and the scanning velocity during the working should be adjusted properly.