摘要
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TiO_(2),中间层为Cr_(2)O_(3)+少量TiO_(2)的混合层,最内层为树枝状Al_(2)O_(3);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TiO_(2),在表面形成致密的Al_(2)O_(3)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Al_(2)O_(3)层无法有效形成隔离保护,形成的Cr_(2)O_(3)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。
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 methodandtheoxidation resistance was evaluated.The surface and cross-sectional morphology,composition and structure of specimens were analyzedby 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℃.Theoxidelayers of WZ-A3 and FGH96 alloys are similar after oxidation at high temperature of 1000℃,which consist of an outermost layer TiO_(2),amiddle mixed layer of Cr_(2)O_(3)and a small amount of TiO_(2)and an innermost layer of dendritic Al_(2)O_(3).There is the enrichment of NbandMoelements at the boundary between the middle and the innermost layer for WZ-A3.The difference in oxidation properties of the threealloysis related to Al content.Al content in FGH97 is high,and the formation of a dense Al_(2)O_(3)layer on the surface can effectively blocktheoutward diffusion of other alloying elements after oxidation at 1000℃,so the FGH97 exhibits excellent oxidation resistance.Al content islow in WZ-A3 and FGH96 and the dendritic Al_(2)O_(3)layer formed can not effectively form isolation.After the Cr_(2)O_(3)reaction,it evaporatesto form holes,which destroys the density of the oxide layer at high temperature.The additions of 1.0wt%Ta and 1.2wt%Nb canimprovethe oxidation resistance of WZ-A3 alloy to a certain extent.
作者
熊江英
尹超
邹志欢
伍靖
杨金龙
霍红光
Xiong Jiangying;Yin Chao;Zou Zhihuan;Wu Jing;Yang Jinlong;Huo Hongguang(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;Shenzhen Wedge Central South Research Institute Co.,Ltd,Shenzhen 518000,China;Shenzhen Wedge Aviation Technology Co.,Ltd,Shenzhen 518000,China;Unit 93145 of the Chinese People’s Liberation Army,Shenzhen 518000)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2024年第12期3475-3484,共10页
Rare Metal Materials and Engineering
基金
广东省引进创新创业团队项目(607264877417)
深圳市工业和信息化局项目(201806071114243770)。
关键词
镍基高温合金
抗氧化性能
氧化行为
氧化层
nickel-based superalloys
oxidation resistance
oxidation behavior
oxidation layer
