| 纯钛TIG焊接接头的高温氧化行为 |
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| 引用本文： | 韩礼红,杨尚谕,王建军,雒设计,李丹,刘明.纯钛TIG焊接接头的高温氧化行为[J].稀有金属材料与工程,2024,53(2):350-356. |
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| 作者姓名： | 韩礼红 杨尚谕 王建军 雒设计 李丹 刘明 |
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| 作者单位： | 中国石油集团工程材料研究院有限公司 油气钻采输送装备全国重点实验室，陕西 西安 710077,中国石油集团工程材料研究院有限公司 油气钻采输送装备全国重点实验室，陕西 西安 710077,中国石油集团工程材料研究院有限公司 油气钻采输送装备全国重点实验室，陕西 西安 710077,西安石油大学 材料科学与工程学院，陕西 西安 710065,西安石油大学 材料科学与工程学院，陕西 西安 710065,西安交通大学 材料科学与工程学院 金属材料强度国家重点实验室，陕西 西安 710049 |
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| 摘 要： | 对纯钛氩弧焊焊接接头在550 ℃下氧化不同时间（2，4，6，8 h）以及在不同温度（650，750，850，950 ℃）下氧化4 h的氧化动力学、氧化形态和氧化产物进行了研究。结果表明，在550 ℃下，氧化时间对焊接接头氧化行为的影响有限，而氧化温度对纯钛焊接接头的氧化行为有显著影响，且温度越高，氧化越严重。在低温下，纯钛焊接接头的氧化动力学接近准线性定律，随着温度升高，氧化速率呈指数增长。此外，焊接接头表面产生的氧化产物是具有锐钛矿和金红石结构的TiO2，温度对TiO2的类型没有明显影响。纯钛焊接接头的氧化过程可描述为：氧气在表面被吸收；氧化物优先在缺陷区形核；氧化物横向生长、增厚。在较高温度下，氧化膜中出现裂纹或空隙，成为O原子传输通道，导致O和Ti原子的高扩散速率和氧化速率。
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| 关 键 词： | 焊接接头 氧化处理 氧化动力学 氧化膜 |
| 收稿时间： | 2023/5/15 0:00:00 |
| 修稿时间： | 2023/6/25 0:00:00 |
High Temperature Oxidation Behavior of Pure Ti TIG Welded Joint |
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| Han Lihong,Yang Shangyu,Wang Jianjun,Luo Sheji,Li Dan and Liu Ming.High Temperature Oxidation Behavior of Pure Ti TIG Welded Joint[J].Rare Metal Materials and Engineering,2024,53(2):350-356. |
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| Authors: | Han Lihong Yang Shangyu Wang Jianjun Luo Sheji Li Dan and Liu Ming |
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| Affiliation: | National Key Laboratory of Oil and Gas Drilling and Transportation Equipment, Tubular Goods Research Institute of China National Petroleum Corporation, Xi''an 710077, China,National Key Laboratory of Oil and Gas Drilling and Transportation Equipment, Tubular Goods Research Institute of China National Petroleum Corporation, Xi''an 710077, China,National Key Laboratory of Oil and Gas Drilling and Transportation Equipment, Tubular Goods Research Institute of China National Petroleum Corporation, Xi''an 710077, China,School of Materials Science and Engineering, Xi''an Shiyou University, Xi''an 710065, China,School of Materials Science and Engineering, Xi''an Shiyou University, Xi''an 710065, China,State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi''an Jiaotong University, Xi''an 710049, China |
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| Abstract: | The oxidation behavior, oxidation morphology, and oxidation products of pure Ti joint welded by tungsten inert gas welding technique at 550 °C for different durations (2, 4, 6, and 8 h) and those at different temperatures (650, 750, 850, and 950 °C) for 4 h were investigated. Results show that at 550 °C, the oxidation time has a slight influence on the oxidation behavior of welded joint. The oxidation temperature has a significant impact on the oxidation behavior, and the higher the temperature, the more severe the oxidation of welded joints. The oxidation kinetics is very close to the quasi-linear law at low temperatures. With increasing the temperature, the oxidation rate is increased exponentially. Additionally, the oxidation products generated on the surface of welded joint are TiO2 with anatase and rutile structures, and the temperature barely has effect on the TiO2 type. The oxidation process of pure Ti welded joint can be described as follows: oxygen atoms are absorbed on the surface; oxides preferentially nucleate in the defective zone; oxides grow laterally and the oxidation film becomes thicker. At relatively higher temperatures, the cracks or voids appear in the oxidation film, which become the transmission channels of O atoms, leading to the high diffusion rate of O and Ti atoms and high oxidation rate. |
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| Keywords: | welded joint oxidation treatment oxidation kinetics oxidation film |
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