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| 稀土La2O3对CMT堆焊Inconel 625合金显微组织和抗高温氧化性能影响 |
| Effect of La2O3 on Microstructure and High-temperature Oxidation Resistance of Inconel 625 Alloy by CMT Surfacing |
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| DOI：10.3969/j.issn.1674-6457.2023.07.021 |
| 中文关键词: 镍基高温涂层 增材制造 稀土氧化物 CMT 高温氧化 |
| 英文关键词: nickel-based high-temperature coating additive manufacturing rare earth oxide CMT high-temperature oxidation |
| 基金项目:广东省粤港澳大湾区国际科技创新中心建设项目(2022A0505050052);广东省基础与应用基础研究基金(2021A1515011756) |
| Author Name | Affiliation | | WANG Xiao-ling | Guoneng Fuquan Power Generation Co., Ltd., Guizhou Fuquan 550501, China | | ZHU Kai-yang | Guoneng Fuquan Power Generation Co., Ltd., Guizhou Fuquan 550501, China | | GU Xian-feng | Guoneng Fuquan Power Generation Co., Ltd., Guizhou Fuquan 550501, China | | DUAN Jun-jie | Pourin Special Welding Technology Co., Ltd., Guangdong Jiangmen 529728, China | | YANG Ke | Guoneng Fuquan Power Generation Co., Ltd., Guizhou Fuquan 550501, China
China-Ukraine Institute of Welding, Guangdong Academy of Sciences, Guangzhou 510650, China | | ZOU Xiao-dong | China-Ukraine Institute of Welding, Guangdong Academy of Sciences, Guangzhou 510650, China | | LI Wei | Beijing Jinwei Welding Materials Co., Ltd., Beijing 102200, China | | YI Jiang-long | China-Ukraine Institute of Welding, Guangdong Academy of Sciences, Guangzhou 510650, China |
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| 中文摘要: |
| 目的 研究稀土氧化物对CMT堆焊镍基合金显微组织和性能的影响规律。方法 采用静电自组装工艺制备含有1%(质量分数，下同)La2O3的Inconel 625药芯焊丝，再采用CMT堆焊工艺制备Inconel 625和1% La2O3/Inconel 625镍基合金试样。系统研究添加La2O3对Inconel 625堆焊试样显微组织、显微硬度、拉伸强度及抗高温氧化性能的影响。结果 添加了La2O3的Inconel 625堆焊试样的金相组织明显细化，且显微组织由柱状晶转变为等轴晶。基体组织主要为γ–Ni固溶体和少量Laves相，且添加了La2O3的镍基合金Laves相的尺寸更为粗大。随着稀土氧化物La2O3的添加，显微硬度值从(235.97±2.99)HV0.3增加到(246.53±4.10)HV0.3，抗拉强度从543.12 MPa增加到564.25 MPa。在高温氧化试验条件下，CMT堆焊1% La2O3/Inconel 625试样的氧化速率明显小于未添加La2O3的Inconel 625原始试样的氧化速率。结论 稀土La2O3的添加产生了细晶强化以及柱状晶向等轴晶的转变，使Inconel 625堆焊试样的显微硬度和抗拉强度都有了一定的提升。在高温氧化过程中，稀土La2O3可作为Cr2O3氧化物的形核中心，促进致密Cr2O3氧化膜生长，相应提升了其表面的抗高温氧化性能。 |
| 英文摘要: |
| The work aims to study the effect of rare earth oxide on the microstructure evolution and properties of nickel-based alloy by CMT surfacing. First of all, the electrostatic self-assembly process was used to prepare 1wt.% La2O3/Inconel 625 flux-cored welding wire, and Inconel 625 and 1wt.% La2O3/Inconel 625 nickel-based alloy samples were manufactured by CMT surfacing process. The effects of microstructure, microhardness, tensile strength, and high-temperature oxidation resistance were systematically analyzed. The microstructure of Inconel 625 surfacing sample was refined after addition of La2O3, changing from columnar crystal to equiaxed crystal. The matrix structure was mainly composed of γ-Ni solid solution and a small amount of Laves phase, and the Laves phase size of nickel-based alloy with La2O3 was larger. With the addition of La2O3, the microhardness value increased from (235.97±2.99) HV0.3 to (246.53±4.10) HV0.3. The tensile strength increased from 543.12 MPa to 564.25 MPa. Under the high-temperature oxidation test conditions, the oxidation weight gain rate of CMT surfacing 1wt.% La2O3/Inconel 625 sample was significantly lower than that of the original Inconel 625 sample. The microhardness and tensile strength are improved to a certain extent based on the fine grain strengthening and the transformation from columnar crystal to equiaxed crystal caused by the addition of rare earth La2O3. In the process of high-temperature oxidation, rare earth La2O3 can also serve as the nucleation site of Cr2O3 oxide, promote the growth of dense Cr2O3 oxide film, and correspondingly improve the high-temperature oxidation resistance. |
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