燃油喷嘴激光选区熔化成型的内部缺陷控制与检测方法研究

Study on Internal Defects Control and Detection Method of Selective Laser Melting of Fuel Nozzle

通过优化激光选区熔化成型工艺参数控制镍基高温合金成型件的内部缺陷,分析了X射线检测、荧光渗透检测与CT检测三种不同无损检测方法对增材制造件常见微小缺陷的检测能力。结果表明:在激光功率、扫描速率、铺粉厚度、扫描线间距、光斑直径分别为290 W、900 mm/s、40μm、0.11 mm、80μm的条件下,GH536材料成型件内部的冶金质量良好;荧光渗透检测与X射线检测对微小缺陷的识别能力不强,采用工业CT检测能有效检测增材制造件的内部微小缺陷以及多余物等缺陷。

The internal defects of nickel base superalloy parts were controlled by optimizing the process parameters of selective laser melting, and the ability of X-ray inspection, fluorescent penetrant testing and CT inspection to detect the common micro defects of the additive manufacturing parts was compared. The results show that under the condition of 290 W power, 900 mm/s scanning rate, 40 μm powder spreading thickness, 0.11 mm scanning line spacing and 80 μm spot diameter,the metallurgical quality of GH536 parts made of additive is good. Fluorescent penetrant testing and X-ray testing have weak ability to identify tiny defects. The industrial CT can effectively detect the internal micro defects and superfluous matter of the additive manufacturing parts.