【摘要】 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。更多还原

【Abstract】 FOD(foreign object damage) simulation of aircraft engine compressor blades is conducted by drop hammer method on TC4 welded joint with micro plasma arc welding, studying the micro structure, depth and width of FOD. Results show that the depth and width of FOD increase linearly with the impact absorbing energy. Given the same impact absorbing energy, the size of FOD reaches its maximum at surfacing layer, then at HAZ(heat affected zone), and minimum at base-metal. The damage form generated by drop hammer method includes surface cracks, subsurface plastic deformation, subsurface microvoid, subsurface cracks and adiabatic shear zones. Given 4 ~8 J impact absorbing energy, microvoid appeares at the base titanium alloy metal, HAZ as well as surfacing layer, and is developed into cracks under the action of shear forces at HAZ and adiabatic shear zones.更多还原