| 唐函遥,朱红梅,邱长军,申龙章.成形气氛对大气环境下激光修复GH4169组织与性能的影响[J].稀有金属材料与工程,2023,52(4):1361~1368.[Tang Hanyao,Zhu Hongmei,Qiu Changjun,Shen Longzhang.Effect of Forming Atmosphere on Microstructure and Properties of Laser Repaired GH4169 in Atmospheric Environment[J].Rare Metal Materials and Engineering,2023,52(4):1361~1368.] |
| 成形气氛对大气环境下激光修复GH4169组织与性能的影响 |
| 投稿时间：2022-03-12 修订日期：2022-04-13 |
| 中文关键词: 激光修复 成形气氛 镍基合金 组织性能 |
| 基金项目:中央军委装备发展部装备预研基金项目(61400040204) |
| 中文摘要: |
| 激光制造高性能GH4169镍基合金通常在密闭环境下进行，导致部件加工尺寸受限和成本增加。为了拓宽激光增材制造和再制造GH4169合金的应用，本文尝试在大气环境不同气氛（Ar、N2）下进行激光修复实验。结果表明，在大气环境Ar气氛下，修复层主要由γ相和长链状Laves相组成，呈典型的柱状晶组织，其抗拉强度、屈服强度和延伸率分别为874 MPa、621 MPa和23.1 %。在大气环境N2气氛下，由于其热导率更高，熔池冷却速率更快，修复层主要由γ相、尺寸与体积分数更小的颗粒状Laves相以及（Ti,Nb）N颗粒相组成，呈细化的枝晶组织，其抗拉强度、屈服强度和延伸率分别为935 MPa、649 MPa和24.9 %。由于细晶强化和第二相析出强化的共同作用，在大气环境N2气氛下可成功实现对GH4169合金低成本、高效率的激光修复。 |
| Effect of Forming Atmosphere on Microstructure and Properties of Laser Repaired GH4169 in Atmospheric Environment |
| 英文关键词:Laser repairing Forming atmosphere Nickel-based alloys Microstructure and properties |
| 英文摘要: |
| The laser manufactured high-performance GH4169 Ni-based alloys were generally prepared in a closed environment, resulting in limited component dimension and increased fabrication cost. In order to broaden the application of laser additive manufacturing and remanufacturing GH4169 alloy, this work was attempted under different atmospheres (Ar, N2) in atmospheric environment. The results indicat that the laser-repaired layer under Ar atmosphere is mainly composed of γ phase and long-chain shaped Laves phase, with a typical columnar crystal structure. The tensile strength, yield strength and elongation is 874 MPa, 621 MPa and 23.1 %, respectively. In contrast, due to its higher thermal conductivity and faster molten pool cooling rate under N2 atmosphere, the laser-repaired layer is mainly composed of γ phase, granular Laves phase with smaller size and volume fraction, and granular (Ti,Nb)N phase. The dendritic structure is refined, with tensile strength, yield strength and elongation of 935 MPa, 649 MPa and 24.9 %, respectively. Under the combined effects of fine grain strengthening and second-phase precipitation strengthening, the laser repairing of GH4169 alloy can be achieved successfully under N2 atmosphere at low cost and high efficiency. |
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