Development of Coated Single-Crystal Superalloy Systems for Gas Turbine Applications

Strangman, T. E.; Fujii, M.; Nguyen-Dinh, Xuan

doi:10.7449/1984/superalloys_1984_795_804

Cited by 4 publications

(2 citation statements)

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“…Work with SC derivatives of MAR-M247 showed that there was little difference in rupture life between material produced with the exothermic mould system and that with the high-rate solidification process. 46 These results emphasize the importance of obtaining data at stresses and temperatures approaching those relevant to service behaviour, and in these conditions, DS IN 738 LC would appear to offer some Fig. 27.…”

Section: Va + 24ppmnmentioning

confidence: 83%

Mechanical properties of conventionally cast, directionally solidified, and single-crystal superalloys

Quested¹,

Osgerby²

1986

Materials Science and Technology

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In this paper the authors compare the creep and low-cycle fatigue properties of conventional, directionally solidified, and single-crystal castings produced from nickel-base superalloys. A brief historical review describes the reasons for the evolution from wrought to cast product through directionally solidified to modern single-crystal ('monocrystal') castings. The influence of microstructural variations produced by the casting conditions, such as porosity and grain size, on creep and low-cycle fatigue properties are illustrated. The important aspects of postsolidification heat treatment, hot isostatic pressing, and the damaging effects of impurities are described for conventional castings. The results of controlling the microstructures produced by directional solidification especially by high temperature gradient solidification are demonstrated by comparing the creep properties of directionally solidified materials with those of the conventionally cast alloys in long-term tests. The creep and low-cycle fatigue properties depend on the stress direction relative to the crystallographic directions of the material for both directionally solidified and single-crystal castings. For single crystals, individual alloys show variable dependences of properties on the crystallographic directions. Directionally solidified materials show advantages in thin sections and are less sensitive to the effects of impurities compared to conventional castings. MST/329

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Section: Va + 24ppmnmentioning

confidence: 83%

Mechanical properties of conventionally cast, directionally solidified, and single-crystal superalloys

Quested¹,

Osgerby²

1986

Materials Science and Technology

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“…The demand for high-performance alloys in the manufacturing of turbine blades for fuel-efficient aircraft engines has led to the advancement of production technologies and the development of nickel-based superalloys [1] [2] [3] [4].…”

Section: Introductionmentioning

confidence: 99%

Carbides Formation in MarM247 Directional Solidified during Stress-Rupture Test at High Temperature

Moreno,

Mizrahi,

Lipkin

et al. 2023

JMMCE

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In our study, stress-rupture tests were conducted at elevated temperatures to examine the impact of high temperature on MarM247 LC (low carbon). Our main objective was to investigate the alterations in the microstructure, particularly the carbon precipitation, during long-term stress-rupture tests. It was observed that cracks developed near the sample neck, following the path of the carbides and the gamma matrix, rather than occurring in the gamma-gamma prime eutectic. This occurred despite the formation of carbides because of prolonged exposure to high temperature and load, and the crack propagation did not follow that path. Based on these findings, we suggest that a reduction in the carbon content of Mar-M247 LC can enhance the sample's lifespan when subjected to temperatures below 760˚C and a stress of 690 MPa.

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Evaluating sol-gel ceramic thin films for metal implant applications. II. Adhesion and fatigue properties of zirconia films on Ti-6Al-4V

Filiaggi

Pilliar

Abdulla

1996

J. Biomed. Mater. Res.

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The degree to which ceramic coatings or thin films applied to bone-interfacing metallic implants can improve the overall performance of these implants with respect to implant fixation, wear, or corrosion relies especially on the response of these films to loading. In this study, the adhesion and fatigue properties of sol-gel zirconia films that could be reproducibly deposited onto polished Ti-6AI-4V substrates was investigated. For zirconia films on the order of 100 nm thick, a shear lag-based strain approach indicated a shear adhesion strength of approximately 275 MPa. Small variations in film thickness and substrate surface preparation had little effect on this adhesion, which was believed to be due to alkoxide molecule interactions with free hydroxyl groups on the substrate surface as well as some limited interfacial diffusion following the 500 degrees C anneal. Subsequent fatigue testing of these films in air using novel tapered rotating beam fatigue samples demonstrated their excellent fatigue characteristics, with films surviving up to 10(7) cycles, the endurance limit of the Ti-6AI-4V (approximately 635 MPa). Overall, the exceptional mechanical properties of this ZrO2/Ti-6AI-4V system along with the inherent advantages of sol-gel processing support continued studies to utilize this technology for implant surface modification.

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Development of Coated Single-Crystal Superalloy Systems for Gas Turbine Applications

Cited by 4 publications

References 1 publication

Mechanical properties of conventionally cast, directionally solidified, and single-crystal superalloys

Mechanical properties of conventionally cast, directionally solidified, and single-crystal superalloys

Carbides Formation in MarM247 Directional Solidified during Stress-Rupture Test at High Temperature

Evaluating sol-gel ceramic thin films for metal implant applications. II. Adhesion and fatigue properties of zirconia films on Ti-6Al-4V

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