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采用微束等离子弧在钛合金上进行堆焊,用落锤法模拟发动机压气机叶片工作过程中受到的外物损伤,研究冲击后钛合金母材、热影响区、堆焊层损伤部位的缺口尺寸和微观组织。试验结果表明:冲击缺口深度和宽度随冲击能量的增加而线性增加;冲击能量相同,堆焊层FOD尺寸最大,其次是热影响区,母材缺口尺寸最小;落锤法产生的FOD损伤有表面裂纹、亚表面塑性变形、亚表面微孔、亚表面裂纹和绝热剪切带;冲击功为4~8 J时,钛合金母材、热影响区、堆焊层出现微孔,热影响区、堆焊层绝热剪切带的微孔在剪切力的作用下发展成裂纹。
The micro-beam plasma arc welding was performed on the titanium alloy. The drop damage method was used to simulate the foreign object damage during the working process of the engine compressor blade. The gap between the damaged area of the base alloy and the heat affected zone Size and microstructure. The results show that the impact notch depth and width increase linearly with the increase of impact energy. The impact energy is the same, the FOD size of the overlay is the largest, followed by the heat affected zone, and the base metal notch size is the smallest. Cracks, sub-surface plastic deformation, sub-surface micropores, subsurface cracks and adiabatic shear bands. When the impact energy is 4 ~ 8 J, micropores and heat affected zone appear in the base metal, heat- Micro-holes in the over-heat blanket of the overlay develop into cracks under the action of shear force.