两种MCrAlY涂层与DD98M合金的互扩散行为
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摘要
为研究MCrAlY涂层与DD98M合金的互扩散行为,采用多弧离子镀技术在DD98M合金表面制备了NiCrAlY与NiCoCrAlY涂层,运用XRD、SEM/EDS、EPMA、TEM等方法分别分析了两种MCrAlY涂层对DD98M合金恒温氧化及互扩散行为的影响。结果表明:在1 050℃氧化100 h后,NiCrAlY和NiCoCrAlY涂层表面均形成了一层连续致密的以α-Al2O3为主的保护膜,显著提高了DD98M合金的抗氧化性能。两种MCrAlY涂层与DD98M合金之间形成了因互扩散而导致的互扩散区(IDZ);在NiCoCrAlY涂层试样中还形成了二次反应区(SRZ),但在NiCrAlY涂层试样中却并未发现。NiCoCrAlY涂层试样形成的SRZ中析出了很多针状与颗粒状的μ-TCP相;NiCrAlY涂层试样,合金基体γ/γ′结构中γ′相的体积分数没有明显增加,基体的化学组成与原始成分相比也没有发生明显改变,因此抑制了SRZ的形成。
In order to investigate the inter-diffusion behaviors between two types of MCrAlY coatings and DD98 M alloy,NiCrAlY and NiCoCrAlY coatings were deposited on DD98 M specimens by arc ion plating. The effects of two types of MCrAlY coatings on isothermal oxidation and inter-diffusion behaviors of DD98 M alloy were analyzed by XRD, SEM/EDS,EPMA and TEM, respectively. The results indicate that the oxide scales formed on the surface of the NiCoCrAlY-coated and NiCrAlY-coated DD98 M alloy are adherent and dense and mainly composed of α-Al_2O_3, which noticeably improve the oxidation resistance of DD98 M alloy after isothermal oxidation at 1 050 ℃ for 100 h. Inter-diffusion occurs between the two types of coatings and the substrate, which lead to the formation of the inter-diffusion zone(IDZ). The secondary reaction zone(SRZ) containing the μ-TCP phase is formed in the NiCoCrAlY coated specimen but not in the NiCrAlY. Many needle-like and granular μ-TCP phases precipitate in the SRZ of the NiCoCrAlY coated specimen. For the NiCrAlY coated specimen, theγ′ volume fraction in the γ/γ′ microstructure of the substrate slightly increases. The composition of the substrate slightly changes compared with its original composition. Thus the formation of SRZ is completely suppressed when being oxidized at1 050 ℃.
In order to investigate the inter-diffusion behaviors between two types of MCrAlY coatings and DD98 M alloy,NiCrAlY and NiCoCrAlY coatings were deposited on DD98 M specimens by arc ion plating. The effects of two types of MCrAlY coatings on isothermal oxidation and inter-diffusion behaviors of DD98 M alloy were analyzed by XRD, SEM/EDS,EPMA and TEM, respectively. The results indicate that the oxide scales formed on the surface of the NiCoCrAlY-coated and NiCrAlY-coated DD98 M alloy are adherent and dense and mainly composed of α-Al_2O_3, which noticeably improve the oxidation resistance of DD98 M alloy after isothermal oxidation at 1 050 ℃ for 100 h. Inter-diffusion occurs between the two types of coatings and the substrate, which lead to the formation of the inter-diffusion zone(IDZ). The secondary reaction zone(SRZ) containing the μ-TCP phase is formed in the NiCoCrAlY coated specimen but not in the NiCrAlY. Many needle-like and granular μ-TCP phases precipitate in the SRZ of the NiCoCrAlY coated specimen. For the NiCrAlY coated specimen, theγ′ volume fraction in the γ/γ′ microstructure of the substrate slightly increases. The composition of the substrate slightly changes compared with its original composition. Thus the formation of SRZ is completely suppressed when being oxidized at1 050 ℃.
引文
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[2]RETTBERG L H,LAUX B,HE M Y,et al.Growth stresses in thermally grown oxides on nickel-based single-crystal alloys[J].Metallurgical&Materials Transactions A,2016,47(3):1132-1142.
[3]GAO Q,GONG Y D,ZHOU Y G,et al.Micro-milling forces test for single crystal nickel-based superalloy[J].Journal of Northeastern University,2017,38(4):542-545.
[4]YUAN K,PENG R L,LI X H,et al.Some aspects of elemental behaviour in HVOF MCr Al Y coatings in high-temperature oxidation[J].Surface&Coatings Technology,2015,261(5):86-101.
[5]RHYS-JONES T N.Coatings for blade and vane application in gas turbines[J].Corrosion Science,1989,6(9):623-646.
[6]NICHOLLS J R,STEPHENSON D J.High temperature coatings for gas turbines[J].Surface Engineering,1991,3(6):156-163.
[7]LIU R D,JIANG S M,GUO C Q,et al.The alumina scale growth and interdiffusion behaviour of Pt modified Al Si Ycoating during cyclic oxidation[J].Corrosion Science,2016,574(11):368-375.
[8]YANG J X,ZHENG Q,SUN X F,et al.Formation ofμphase during thermal exposure and its effect on the properties of K465 superalloy[J].Scripta Materialia,2006,55(4):331-334.
[9]LONG F,YOO Y S,JO C Y,et al.Formation ofηandσphase in three polycrystalline superalloys and their impact on tensile properties[J].Materials Science and Engineering A,2009,527(1-2):361-369.
[10]CHENG K Y,JO C Y,JIN T,et al.Precipitation behavior ofμphase and creep rupture in single crystal superalloy CM-SX-4[J].Journal of Alloys&Compounds,2011,509(25):7078-7086.
[11]TAN X P,HONG H U,CHOI B G,et al.Characterization of topologically close-packed phases in secondary reaction zone in a coated CMSX-4 single crystal Ni-based superalloy[J].Journal of Materials Science,2013,48(3):1085-1089.
[12]WANG D,PENG H,GONG S,et al.Ni Al Hf/Ru:Promising bond coat materials in thermal barrier coatings for advanced single crystal superalloys[J].Corrosion Science,2014,78(1):304-312.
[13]RAE C M,REED R C.The precipitation of topologically close-packed phases in rhenium containing superalloys[J].Acta Materialia,2001,49(19):4113-4125.
[14]ZHONG J,LIU J,ZHOU X,et al.Thermal cyclic oxidation and interdiffusion of Ni Co Cr Al YHf coating on a Ni-based single crystal superalloy[J].Journal of Alloys&Compounds,2016,657(3):616-625.
[15]RETTIG R,SINGER R F.Numerical modelling of precipitation of topologically close-packed phases in nickel-base superalloys[J].Acta Materialia,2011,59(1):317-327.
[16]HAN G M,LI J G,TAO J,et al.High cycle fatigue behavior of a nickel-based single crystal superalloy DD98M at 900℃[J].Acta Metallurgica Sinica,2012,48(2):170-175.
[17]SHI L,XIN L,WANG F,et al.Oxidation behavior of sputtered DD98M nanorystalline coating at 1 000℃[J].Oxidation of Metals,2016,86(3-4):1-16.
[18]ANDERS A.Approaches to rid cathodic arc plasmas of macro-and nanoparticles:A review[J].Surface&Coatings Technology,1999(120-121):319-330.
[19]LIANG T Q,GUO H B,PENG H,et al.Precipitation phases in the nickel-based superalloy DZ125 with YSZ/Co Cr Al Ythermal barrier coating[J].Journal of Alloys&Compounds,2011,509(7):8542-8548.
[20]WANG W Z,JIN T,LIU J L,et al.Role of Re and Co on microstructure andγ’coarsening in single crystal superalloys[J].Materials Science&Engineering A,2008,479(3):148-156.
[21]WHITTLE D P.High temperature oxidation of superalloys[M].London:Applied Science Publishers,1978:109-111.
[22]FELIX P.Deposition and corrosion in gas turbines[M].London:Applied Science Publishers,1972:331-335.
[23]LI M S.High temperature corrosion of metals[M].Beijing:Metallurgical Industry Press,2001:3-13.
[24]MACKAY R A,GABB T P,GARG A,et al.Influence of composition on microstructural parameters of single crystal nickel-base sueralloys[J].Materials Characterization,2012,70(2):83-100.