High Temperature Oxidation Behavior of Pure Ti TIG Welded Joint
The oxidation behavior,oxidation morphology,and oxidation products of pure Ti joint welded by tungsten inert gas welding technique at 550 ℃ for different durations(2,4,6,and 8 h)and those at different temperatures(650,750,850,and 950 ℃)for 4 h were investigated.Results show that at 550 ℃,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.
welded jointoxidation treatmentoxidation kineticsoxidation film
韩礼红、杨尚谕、王建军、雒设计、李丹、刘明
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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
焊接接头 氧化处理 氧化动力学 氧化膜
Program of Key Technologies on Evaluation and Repair of Casing Damaging in Oil and Gas Well
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