首页|不同镍基粉末高温合金的氧化行为研究

不同镍基粉末高温合金的氧化行为研究

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对FGH4113A(WZ-A3)、FGH96和FGH97这3种镍基粉末高温合金进行815、900和1000 ℃大气环境下的高温氧化试验.采用静态增重法测定合金在不同温度下的氧化动力学曲线并评估其抗氧化性能,利用XRD、SEM、EDS等分析合金氧化后的表面及截面形貌、成分及相结构等.结果表明:在815和900 ℃时3种合金均为完全抗氧化级,1000 ℃时WZ-A3为抗氧化级,FGH96为次抗氧化级,FGH97仍为完全抗氧化级.WZ-A3和FGH96合金经1000 ℃高温氧化后氧化层结构类似,最外层为TiO2,中间层为Cr2O3+少量TiO2的混合层,最内层为树枝状A12O3;WZ-A3合金氧化中间层和最内层的分界处还存在Nb和Mo元素的富集.3种合金抗氧化性能的差别与Al含量有关.FGH97中Al含量较高,经1000 ℃氧化后,外表面存在孤岛状TiO2,在表面形成致密的Al2O3层,有效地阻隔了其它合金元素向外扩散,使合金表现出优异的抗氧化性能.WZ-A3和FGH96中Al含量较低,形成的树枝状Al2O3层无法有效形成隔离保护,形成的Cr2O3氧化层在高温下挥发形成孔洞破坏了氧化层的致密度.1.0%Ta和1.2%Nb(质量分数)的添加在一定程度上提高了 WZ-A3合金的抗氧化性能.
Oxidation Behavior of Different Powder Metallurgy Nickel-Based Superalloys
Three nickel-based powder superalloys FGH4113A(WZ-A3),FGH96 and FGH97 were subjected to oxidation tests in air at 815,900 and 1000 ℃.The oxidation dynamics curve of the alloys at different temperatures was determined by static mass gain method and the oxidation resistance was evaluated.The surface and cross-sectional morphology,composition and structure of specimens were analyzed by XRD,SEM,EDS after oxidation tests.The results show that three alloys are completely antioxidant grade at 815 and 900 ℃.WZ-A3,FGH96 and FGH97 are antioxidant grade,secondary antioxidant grade and complete antioxidant grade,respectively at 1000 ℃.The oxide layers of WZ-A3 and FGH96 alloys are similar after oxidation at high temperature of 1000 ℃,which consist of an outermost layer TiO2,a middle mixed layer of Cr2O3 and a small amount of TiO2 and an innermost layer of dendritic Al2O3.There is the enrichment of Nb and Mo elements at the boundary between the middle and the innermost layer for WZ-A3.The difference in oxidation properties of the three alloys is related to Al content.Al content in FGH97 is high,and the formation of a dense Al2O3 layer on the surface can effectively block the outward diffusion of other alloying elements after oxidation at 1000 ℃,so the FGH97 exhibits excellent oxidation resistance.Al content is low in WZ-A3 and FGH96 and the dendritic Al2O3 layer formed can not effectively form isolation.After the Cr2O3 reaction,it evaporates to form holes,which destroys the density of the oxide layer at high temperature.The additions of 1.0wt%Ta and 1.2wt%Nb can improve the oxidation resistance of WZ-A3 alloy to a certain extent.

nickel-based superalloysoxidation resistanceoxidation behavioroxidation layer

熊江英、尹超、邹志欢、伍靖、杨金龙、霍红光

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中南大学粉末冶金国家重点实验室,湖南长沙 410083

深圳市万泽中南研究院有限公司,广东 深圳 518000

深圳市万泽航空科技有限责任公司,广东 深圳 518000

中国人民解放军93145部队,广东 深圳 518000

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镍基高温合金 抗氧化性能 氧化行为 氧化层

2024

稀有金属材料与工程
中国有色金属学会,中国材料研究学会,西北有色金属研究院

稀有金属材料与工程

CSTPCD北大核心
影响因子:0.634
ISSN:1002-185X
年,卷(期):2024.53(12)