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Showing 1 to 20 of 20 for “"CMSX-4"”.
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Validierung des nichtlinearen Verformungsverhaltens von großen Einkristall-Gasturbinenschaufeln aus CMSX-4
The achievement of high efficiency in large-based stationary gas turbines for electric power generation requires increased gas temperatures. Gas temperatures higher than 1300°C can only be handled using air cooled structures to keep the metal temperatures below 1000°C. Only single crystal …
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Anwendungsgrenzen von modernen Nickelbasis-Superlegierungen in effusionsgekühlten Bauteilen zukünftiger Gasturbinen
… damage behaviour of two nickel-base superalloys, CMSX-4 and SX CM186LC, have been investigated. Hot-tensile, tensile creep and low-cycle-fatigue tests have been performed on single crystal and directionally solidified variants at temperatures up to 1000°C to compare their tensile-, creep- and …
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Deformation at Low Temperatures in Single Crystal Ni-base Superalloys
… the present work, the commercial 2nd-generation CMSX-4, 3rd-generation RR3010 and 4th-generation TMS-138A alloys have been systematically studied across a range of temperatures below 650 °C using monotonic tensile testing. The difference in behaviour between alloy generations as a function of …
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Ni-Al-Ta alloys for high temperature abrasive coatings
… between the anchor phase and the underlying CMSX-4 turbine blade is also essential, as interdiffusion occurs over the lifetime of the blade. These two requirements, and preliminary wear behaviour, were investigated for the Ni-Al-Ta ternary system. The isothermal oxidation behaviour of a …
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Analysis and modelling of the dislocation response during non-isothermal creep in Ni-SX superalloys
… of the single-crystal nickel-based superalloys CMSX-4 and CMSX-10 changes when subjected to a non-isothermal test cycle varying between the tertiary and rafting creep regimes. For this purpose, creep tests cycling between a base temperature of 900 ◦C and a peak temperature of 1050 ◦C under a …
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Recrystallisation in Single Crystal Nickel-Based Superalloys
… close to the y' solvus, which is 1250-1310°C for CMSX 4, where dislocations accumulate in the interdendritic areas that are the first to precipitate the y'. On examining the cast surface of CMSX 4, two sources of nucleation for recrystallisation were identified (Chapter 4). Firstly, micro-grains …
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Towards inert cores for investment casting
… increase the retention of reactive elements in CMSX-4.
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The effect of bond coat oxidation on the microstructure and endurance of two thermal barrier coating systems
… thermal barrier coating systems consisting of a CMSX-4 nickel-based superalloy substrate, NiCoCrAlY overlay bond coat applied by two different techniques and a yttria stabilised zirconia topcoat applied by electron beam physical vapour deposition (EBPVD). The bond coats were applied by either …
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Ermittlung des Verformungs- und Schädigungsverhaltens von Wärmedämmschichtsystemen
… blade alloy IN 792 CC or the single crystalline CMSX-4. For the isothermal low cycle fatigue (LCF) testing, additional means for the heating of coated specimens were developed and for the thermomechanical fatigue (TMF) tests, completely new test techniques were necessary. The manufacture of …
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Understanding the Yield Behaviour of Single Crystal Ni-based Superalloys
… of the single crystal Ni-based superalloys CMSX-4 under different deformation conditions. In a two-phase superalloy, during early stages of tensile deformation, dislocations nucleate in the γ matrix phase and glide in the narrow channels between precipitates. The yield point was found to …
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Neue Verfahren zur Analyse des Verformungs- und Schädigungsverhaltens von MCrAlY-Schichten im Wärmedämmschichtsystem
… 0,61% Y, 0,4% Hf) on the single crystal alloy CMSX-4. The creep properties within the coating system of the MCrAlY bond coat have been investigated using a double shear creep testing assembly, especially developed for thermal barrier coatings. Parameters to describe primary and secondary creep …
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High temperature corrosion in gas turbines : thermodynamic modelling and experimental results
… of three base materials, IN738, CM247 and CMSX-4, and a NiCrAlY-coating, SV20, were tested between 750 and 950°C. A salt-spraying test was used with either Na2SO4 or Na2SO4/K2SO4 as a deposit in an atmosphere of air with 300ppm SO2. Both salts gave the same corrosion morphology. The …
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Effect of thermal and mechanical loadings on the degradation and failure modes of APS TBCs
… with a NiCoCrAlY bond coat onto a CMSX-4 substrate and was subjected to six types of tests: (i) isothermal furnace tests, (ii) thermal cycling, (iii) cyclic oxidation, (iv) cyclic oxidation with temperature gradient, (v) thermomechanical fatigue, (vi) thermomechanical fatigue with a …
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Bonding mechanisms in the application of thermal barrier coatings to turbine blades.
… system to consist of TBC, Al2O3 bond coat and CMSX-4 superalloy substrate in all cases. The intermediate layer between the TBC and bond coat consists of Al2O3 which has been identified as responsible for maintaining the adhesion. Also identified is evidence of Ti segregation at the Al2O3 / bond …
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Finite element simulation of stress evolution in thermal barrier coating systems
… data of thermo-mechanical properties of CMSX-4, MCrAlY (Bond Coat) and APS-TBC (partially stabilized zirconia), were implemented into an FE-model in order to simulate the stress development at the metal/ceramic interface. The FE model reproduced the specimen geometry used in corresponding …
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Nondestructive Evaluation Of Thermal Barrier Coatings With Thermal Wave Imaging And Photostimulated Luminescence Spectroscopy
… with an as-coated (Ni,Pt)Al bond coat on a CMSX-4 superalloy substrate. Specimens were thermally cycled with a 10 minute ramp to a peak temperature of 1121°C, 40 minute hold at peak temperature, and 10 minute forced air quench. The TBCs were periodically removed from thermal cycling for NDE …
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Influence of surface hardening on single crystal nickel-based superalloys
… layers. Test samples made from the superalloy CMSX-4, treated by MSP or DCR with varied combinations of parameters, were examined using LM analysis and backscattered electron imaging. It was shown that in MSP, greater intensity increased the depth of cold work, while peening coverage chiefly …