电子束精炼Inconel718合金的高温氧化行为  

High Temperature Oxidation Behavior of Electron Beam Refined Inconel718 Alloy

作　　者：魏鑫[1] 赵龙海 谭毅[1] 游小刚[1] 石爽[1] 尤启凡 WEI Xin;ZHAO Longhai;TAN Yi;YOU Xiaogang;SHI Shuang;YOU Qifan(Laboratory for New Energy Material Energetic Beam Metallurgical Equipment Engineering of Liaoning Province, School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China)

机构地区：[1]大连理工大学材料科学与工程学院辽宁省新能源材料载能束冶金装备工程实验室,大连116024

出　　处：《机械工程材料》2018年第5期1-8,13,共9页Materials For Mechanical Engineering

基　　金：国家重点研发计划资助项目(2017YFA0403804)

摘　　要：对真空感应熔炼的Inconel718合金进行了电子束精炼,在900,1 000℃空气中对电子束精炼前后的合金进行了恒温氧化试验,对比分析了其高温氧化行为。结果表明:电子束精炼后,合金在900℃氧化120h后的平均氧化速率为0.366 20g·m^(-2)·h^(-1),低于精炼前的,氧化激活能为280.90kJ·mol^(-1),高于精炼前的;900℃和1 000℃氧化120h后,电子束精炼合金氧化膜的外层由Cr_2O_3和TiO_2组成,中间层主要含有Cr_2O_3以及少量的TiO_2和NiCr_2O_4尖晶石,内层主要含有Al_2O_3;电子束精炼合金中微量杂质元素的含量较低且均匀分布,晶粒尺寸较大,合金的抗氧化性能较好。Vacuum induction melted Inconel718 alloy was refined by electron beam smelting.The high temperature oxidation behaviour of the alloy before and after electron beam refining was studied and compared by isothermal oxidation tests in the air at 900,1 000℃.The results show that the average oxidation rate of the electron beam refined alloy oxidized at 900 ℃ for 120 hwas 0.366 20 g·m^-2·h^-1,smaller than that before refining;the oxidative activation energy was 280.90 kJ·mol^-1,higher than that before refining.The outer layer of the oxide film of the electron beam refined alloy oxidized at 900 ℃ and 1 000 ℃ for 120 hwas composed of Cr2O3 and TiO2,the middle layer consisted of Cr2O3 and a small amount of TiO2 and spinel NiCr2O4,and the inner layer was mainly composed of Al2O3.The content of trace impurity elements distributed evenly in the electron beam refined alloy was relatively small,grain size was larger,and the alloy had a better antioxidant property.

关 键 词：INCONEL718合金 电子束精炼 氧化动力学 氧化膜 

分 类 号：TG11[金属学及工艺—物理冶金]