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结合航空发动机大型风扇机匣TC4钛合金静子叶片的修复需求,研究了损伤叶片的激光熔覆修复工艺,对熔覆层成分、组织、显微硬度及力学性能进行了分析。试验结果表明,激光熔覆层TC4钛合金的O、N、H元素成分满足标准要求;激光熔覆区为具有魏氏体组织特征的柱状晶,柱状晶内部为细密的马氏体组织,热影响区为柱状晶和双态组织的混合组织,并逐渐过渡到基体的双态组织;激光熔覆层显微硬度平均比母材高15%,过渡平缓;激光熔覆TC4试样的室温拉伸、400℃高温拉伸、热暴露试验的强度结果均高于母材试样,断后延伸率稍低。采用单道多层熔覆工艺对受损叶片进行修复,验收合格后,风扇机匣得到使用。
Combined with the repair requirements of stator blades of TC4 titanium alloy for aero-engine large fan receiver, the laser cladding repair process of damaged blades was studied, and the composition, microstructure, microhardness and mechanical properties of the cladding were analyzed. The results show that the composition of O, N and H elements in laser cladding TC4 titanium alloy meets the standard requirements. The laser cladding zone is a columnar crystal with the characteristics of Westemon. The interior of the columnar crystal is fine martensite, The influence zone is the mixed structure of columnar crystal and binary microstructure, and gradually transition to the matrix of the dual-state microstructure; laser cladding layer average hardness 15% higher than the base metal, the transition is smooth; TC4 laser cladding laser at room temperature Stretching, 400 ℃ high temperature tensile strength test results are higher than the base metal samples, the elongation after fracture is slightly lower. Single-layer multi-layer cladding process to repair damaged leaves, after passing the acceptance, the fan casing is used.