【摘要】 采用激光熔覆沉积（LCD）成形技术在锻造GH3536合金表面制备了GH3536合金，并对其显微组织与力学性能进行研究。结果表明，LCD成形GH3536合金的激光成形区与锻造基材之间形成了宽度为250～320μm的等轴晶结合区。此外，在成形区还发现了宽度为2～2.5 mm具有枝晶结构的鱼鳞状熔池，以及少量孔洞缺陷。在成形过程中，在结合区和成形区析出了M6C和M23C6碳化物。由于成形区GH3536合金具有比基材更高的室温拉伸强度，激光熔覆沉积成形GH3536表现出明显的各向异性，垂直于成形方向材料的抗拉强度与屈服强度比平行于成形方向分别高12.5%和9.1%，但其延伸率低7.7%。由于成形区GH3536合金晶粒尺寸较大，并且存在少量孔洞缺陷，其维氏硬度比基材降低了12.4%。更多还原

【Abstract】 Microstructure and mechanical properties of GH3536 alloy were examined using laser cladding deposition(LCD) forming technology on the surface of forged GH3536 alloy. The results show that an equiaxed crystal junction zone with a width of 250-320 μm is formed between the laser forming zone of the LCD forming GH3536 alloy and forged substrate. Additionally, the width of the molten pool in the forming zone is 2-2. 5 mm. There is a dendritic structure and a few hole defects in the molten pool. The continuous distribution of M6C and M23C6carbides precipitated in the bonding and forming zones during the forming process. The LCD forming GH3536 exhibits evident anisotropy since the GH3536 alloy in the forming zone has a higher room temperature tensile strength than the base material. The tensile and yield strength of the material perpendicular to the forming direction are 12. 5% each higher than the material parallel to the forming direction. Although, it is 9. 1% longer and its elongation is 7. 7% less. Its Vickers hardness is 12. 4% lower than the base material owing to the large grain size of the GH3536 alloy in the laser forming zone and few hole defects.更多还原