(1. 沈阳航空航天大学航空制造工艺数字化国防重点学科实验室，沈阳 110136;
2. 中航工业沈阳黎明航空发动机(集团)有限公司焊接研究所，沈阳 110043)
摘 要: 采用感应加热装置实现激光沉积修复基材的预热，完成基材预热下的激光沉积修复试验，研究不同基材预热温度对试样形貌尺寸、显微组织及硬度的影响规律。结果表明：基材预热后的沉积试样表面更加平整，试样熔宽和熔高有所增大；随着预热温度的升高，沉积试样底部的柱状晶越粗壮、尺寸越短，顶部的枝晶数量越少，显微组织中片层α组织越粗大；且沉积试样显微硬度轻微降低。基材预热可明显改善沉积质量。
关键字: TA15钛合金；激光沉积修复；预热；形貌尺寸；显微组织；显微硬度
（1. Shenyang Aerospace University, Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process, Shenyang 110136, China;
2. Welding Laboratory, AVIC Shenyang Liming Aero-Engine (Group) Corporation Ltd., Shenyang 110043, China）
Abstract:Laser deposition repair (LDR) experiments under substrate with preheating were completed assisted by induction heating equipment. Themorphology sizes and microstructures of LDR TA15 titanium alloy with different preheating temperatures were characterized, and the microhardness of the deposition layers was tested. The results show that after the substrate is preheated, the deposition layer surface is smoother, cladding width and cladding height are increased. With increasing preheating temperature, macrostructure of the columnar crystal is thicker and shorter at the bottom, the amount of dendritic crystal at the top is reduced, microstructure of lamella α becomes thicker, furthermore, the microhardness is slightly reduced. The substrate with preheating can obviously improve the deposition layer quality.
Key words: TA15 titanium alloy; laser deposition repair; preheating; morphology size; microstructure; microhardness
