论文部分内容阅读
铸造镍基合金M38经过功率密度为2.3×10~4W/cm~2、连续CO_2激光束作用0.2秒处理后,形成了0.6毫米厚树枝胞状晶的表层;大量的TIC被固溶;γ’相及M23C6相重新以更细小的颗粒析出在晶内或晶界上,晶粒的平均直径由0.2—0.3mm减少到~0.01mm;熔区晶粒内的含铬量略有增加;经900℃下的坩锅熔盐法试验,激光处理层较未激光处理层表现出良好的抗热腐蚀性能,特别是显著地减少了沿晶腐蚀.
After casting nickel-based alloy M38 with a power density of 2.3 × 10 ~ 4W / cm ~ 2 and a continuous CO_2 laser beam for 0.2 seconds, a superficial 0.6mm thick dendritic cell was formed; a large amount of TIC was dissolved; And M23C6 phase re-finer particles precipitated in the grain or grain boundary, the average grain diameter decreased from 0.2-0.3mm ~ 0.01mm; the melting zone grain chromium content slightly increased; 900 ℃ Under crucible molten salt test, the laser-treated layer showed better resistance to hot corrosion than the non-laser-treated layer, especially the intergranular corrosion was significantly reduced.