郭柏辰,金国,崔秀芳,郑海元,姜力鹏.粉末循环老化对GH4169激光熔覆修复组织和性能的影响[J].表面技术,2019,48(10):86-92.
GUO Bai-chen,JIN Guo,CUI Xiu-fang,ZHENG Hai-yuan,JIANG Li-peng.Effect of Powder Cyclic Aging on Microstructure and Properties of Laser-repaired GH4169[J].Surface Technology,2019,48(10):86-92 |
| 粉末循环老化对GH4169激光熔覆修复组织和性能的影响 |
| Effect of Powder Cyclic Aging on Microstructure and Properties of Laser-repaired GH4169 |
| 投稿时间：2019-01-04 修订日期：2019-10-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.10.010 |
| 中文关键词: 激光熔覆修复 粉末老化行为 GH4169合金 粉末形貌 Laves相 |
| 英文关键词:laser cladding repairing powder aging behavior GH4169 alloy powder morphology laves phase |
| 基金项目:国家自然科学基金（51775127） |
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| Author | Institution |
| GUO Bai-chen | Harbin Engineering University, Harbin 150001, China |
| JIN Guo | Harbin Engineering University, Harbin 150001, China |
| CUI Xiu-fang | Harbin Engineering University, Harbin 150001, China |
| ZHENG Hai-yuan | Harbin Engineering University, Harbin 150001, China |
| JIANG Li-peng | Harbin Engineering University, Harbin 150001, China |
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| 中文摘要: |
| 目的 探究激光熔覆修复工艺中，循环使用对粉末造成的老化效应及其对组织和性能造成的影响，为粉末循环工艺提供相关理论依据和指导。方法 针对GH4169高温合金，进行了粉末循环利用的实验，将激光熔覆制造过程中的残余粉末再次投入送粉器，进行多次回收循环制造过程。使用扫描电子显微镜、X射线能谱仪、万能力学试验机等设备，研究了粉末在循环使用过程中的演变，以及循环使用前后熔覆修复组织的微观形貌、维氏硬度、弯曲强度性能的差异。结果 随着回收循环次数增加，粉末粒径增大，表面出现熔融现象，粉末的成分出现了变化，其中Nb元素含量显著上升。在回收粉末中发现了具有磁性的杂质颗粒。相比于使用新粉末，使用回收粉末得到的熔覆组织中的Nb元素偏析程度增大，晶粒组织粗化。经过4轮循环后，熔覆层硬度自325.13HV下降至282.81HV，修复试样弯曲强度自785.85 MPa下降至739.41 MPa，下降幅度约为5%。结论 循环工艺对粉末产生了明显的老化影响，这一老化行为从能量和成分两个方面导致了激光熔覆修复GH4169合金组织和性能的劣化。 |
| 英文摘要: |
| The work aims to explore the aging effect and influence of cyclic use on the powder and on the powder’s microstructure and properties in the laser additive repair process, so as to provide relevant theoretical basis and guidance for the powder recycling process. The powder was repeatedly recycled to manufacture the GH4169 superalloy. The residual powder in the laser cladding manufacturing process was refilled into the powder feeder for recycling and manufacturing repeatedly. Scanning electron microscopy, X-ray energy spectrometer, and versatile testing machine were used to evaluate the evolution of the powder during recycling and the differences in the morphology, Vickers hardness and bending strength of the cladding structure before and after the recycling. With the increase of cycle index, the particle size of the powder increased, the surface of the powder melted, and the composition of the powder changed. Especially, the content of Nb significantly increased. Magnetic particles were found in the recycled powder. The compositional segregation of Nb in the additive structure obtained by the recycled powder increased and the grain structure was coarsened. After four cycles, the hardness of the cladding layer decreased from 325.13HV to 282.81HV, and the bending strength of the repaired specimen decreased from 785.85 MPa to 739.41 MPa, with a decrease rate at about 5%. The recycling process has a significant aging effect on the powder. This aging behavior leads to the deterioration of the microstructure and properties of the GH4169 alloy repaired by laser cladding from both energy and composition. |
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