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| TC4钛合金/N4纯镍激光高熵化填粉焊接组织性能研究 |
| Microstructure and Properties of TC4/N4 Laser Welded Joint with High-entropy Filler Powder |
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| DOI：10.3969/j.issn.1674-6457.2022.08.017 |
| 中文关键词: 激光填粉焊接 钛/镍焊接 焊缝高熵化 微观组织 力学性能 |
| 英文关键词: laser welding with filler powder Ti/Ni welding high entropy of weld microstructure mechanical properties |
| 基金项目:广东省基础与应用基础研究基金(2021A1515110897);广东省科协青年科技人才培育计划(SKXRC202201);国家重点研发计划(2020YFE0205300);东莞市重点领域研发项目(20201200300122);广东省科技计划(2022B1212050001) |
| Author Name | Affiliation | | LIU Zhe | Guangdong Provincial Key Laboratory of Advanced Welding Technology, China-Ukraine Institute of Welding, Guangdong Academy of Sciences, Guangzhou 510650, China | | WANG Wei-xiong | School of Materials Science and Engineering, East China Jiaotong University, Nanchang 330013, China | | HE Qiong-yao | Southwest Technology and Engineering Research Institute, Chongqing 400039, China | | GUO Rui | School of Materials Science and Engineering, East China Jiaotong University, Nanchang 330013, China | | ZHAO Yun-qiang | Guangdong Provincial Key Laboratory of Advanced Welding Technology, China-Ukraine Institute of Welding, Guangdong Academy of Sciences, Guangzhou 510650, China | | LIU De-jia | School of Materials Science and Engineering, East China Jiaotong University, Nanchang 330013, China |
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| 中文摘要: |
| 目的 解决TC4/N4异种金属的焊接问题，拓展钛/镍异种金属复合结构的应用范围。方法 选用CuxCoCrMnAl0.8Si0.2高熵填充粉末，采用激光填充粉末焊接的方式实现TC4钛合金和N4纯镍异种金属的连接，对焊缝的表面形貌、显微组织、相成分等微观特征进行表征，测试焊接接头的显微硬度和拉伸性能。结果 激光高熵化填粉焊接接头成形良好，无明显缺陷。通过微观组织表征发现，近钛侧存在以β–Ti+Ti2Ni共晶相为主、宽度为50 μm的化合物区，焊缝内部由等轴枝晶、少量雪花状组织和富Cr的沉淀相组成。焊接接头强度远低于母材强度，焊缝硬度高于母材硬度，近钛侧焊缝区硬度高于近镍侧焊缝区硬度。结论 激光高熵化填粉焊接可实现钛/镍异种金属的连接，改善高熵填充粉末成分，调控焊缝金属的微观结构与接头性能。 |
| 英文摘要: |
| The work aims to solve the welding problem of TC4/N4 dissimilar metals, and expand the application range of Ti/Ni dissimilar metal composite structure. TC4 titanium alloy and N4 pure nickel were joined by laser welding with high-entropy filler powder CuxCoCrMnAl0.8Si0.2. The weld appearance, microstructure and phase composition of joints were characterized and then the microhardness and tensile properties were tested. The joints welded by high-entropy filler powder were good without obvious defects. Through microstructure characterization, it was found that there was a compound zone with a thickness of 50 μm, which was mainly composed of β-Ti+Ti2Ni eutectic phase, and the inside of the weld was composed of equiaxed dendrites, a small amount of snowflake structure and Cr-rich precipitates. The strength of welding joints was much lower than that of base material. The hardness of weld was higher than that of base material, and the hardness of near-titanium weld was higher than that of near-nickel weld. Laser welding with high-entropy filler powder can realize the connection of Ti/Ni dissimilar metals, improve the composition of high-entropy filler powder, and regulate the microstructure and joint performance of weld metal. |
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