Joint Development of a Fourth Generation Single Crystal Superalloy

Walston, Sue; Cetel, A.; MacKay, Rebecca A.; O'hara, K.; Duhl, D. N.; Dreshfield, R. L.

doi:10.7449/2004/superalloys_2004_15_24

Cited by 184 publications

(153 citation statements)

References 4 publications

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“…As operating temperatures increase, the high temperature durability of the engine components must also correspondingly increase. Significant advances in high temperature capability have been achieved through formulations of iron, nickel, and cobalt-base superalloys, though such alloys alone are often inadequate for components located in certain sections of a gas turbine engine, such as the turbine, combustor, and augmentor [1]. A common solution is to protect these components with either an oxidationresistant coating or a thermal barrier coating (TBC) system.…”

Section: Introductionmentioning

confidence: 99%

Development of Improved Bond Coat for Enhanced Turbine Durability

Hazel¹,

Rigney²,

Gorman³

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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Intermetallic alloy development in the early 1990's suggested that zirconium additions to the NiAl system could significantly strengthen the bond coat and prevent surface rumpling that leads to failure of the thermal barrier coating (TBC) system. A new overlay bond coat based on NiAl that incorporates zirconium and chromium has been developed. Additions of both zirconium and chromium were found to be beneficial for TBC adherence and environmental resistance of the bond coat. Overlay processing methods were used to produce the coating in order to accurately control the zirconium and chromium content. Furthermore, the overlay coating incorporated substrate elements, like nickel, to reduce interdiffusion with the substrate.This reduced interdiffusion resulted in greater retention of the load bearing area of the substrate after extended time at temperature. A gas turbine engine was run with both the new overlay bond coat and current diffusion platinum aluminide bond coat for direct comparison. The new NiAl+Cr+Zr overlay bond coat demonstrated improved durability and better protection of the underlying substrate in comparison with the current state of the art diffusion platinum aluminide bond coat.

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Section: Introductionmentioning

confidence: 99%

Development of Improved Bond Coat for Enhanced Turbine Durability

Hazel¹,

Rigney²,

Gorman³

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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“…The turbine blade experiences continuous radial loading from the rotation of the turbine in a harsh environment behind the combustor, so high temperature properties of the material, such as creep strength and oxidation resistance can dictate the performance of the gas turbine engine. Through the "High Temperature Materials 21 Project" conducted by the National Institute of Materials Science (NIMS) in Japan, two 5 th generation Ni-base single crystal superalloys, TMS-162 and TMS-173 [1] have already been successfully developed to supersede the high temperature creep resistance of all reported Ni-base materials, including the recent 4 th generation alloys (EPM-102 and TMS-138) [2,3].…”

Section: Introductionmentioning

confidence: 99%

A 5th Generation SC Superalloy with Balanced High Temperature Properties and Processability

Sato¹,

Harada²,

Yeh³

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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A 5th generation single crystal (SC) superalloy TMS-196 with improved microstructural stability and environmental properties was designed with using NIMS Alloy Design Program and evaluated experimentally. It was found that TMS-196 has a very stable microstructure even after 1000h creep at 1100 C and also very well balanced creep, TMF and environmental properties. TMS-196 also had excellent SC castability; sound cooling blades of up to 300mm long were successfully cast.

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“…But achieving all of the requirements would not have been possible without the addition of a platinum-group metal, ruthenium (Ru), which was discovered to be critical to promoting microstructure stability. [12] The High Temperature Materials 21 program, conducted at Japan's National Institute for Materials Science (NIMS) has been developing new single crystal alloys with superior creep strength and microstructural stability, capable of operation in both subsonic and supersonic engine applications. The primary emphasis has been to increase creep rupture strength at the higher temperatures through a combination of data-driven modeling and key experiments to guide the selection suitable chemistries.…”

Section: Innovation In Materials Sciencementioning

confidence: 99%

Superalloy Technology - A Perspective on Critical Innovations for Turbine Engines

Schafrik¹,

Sprague²

2008

KEM

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High temperature structural materials, such as nickel-based superalloys, have contributed immensely to societal benefit. These materials provide the backbone for many applications within key industries that include chemical and metallurgical processing, oil and gas extraction and refining, energy generation, and aerospace propulsion. Within this broad application space, the best known challenges tackled by these materials have arisen from the demand for large, efficient land-based power turbines and light-weight, highly durable aeronautical jet engines. So impressive has the success of these materials been that some have described the last half of the 20 th century as the Superalloy Age. Many challenges, technical and otherwise, were overcome to achieve successful applications. This paper highlights some of the key developments in nickel superalloy technology, principally from the perspective of aeronautical applications. In the past, it was not unusual for development programs to stretch out 10 to 20 years as the materials technology was developed, followed by the development of engineering practice, and lengthy production scaleup. And many developments fell by the wayside. Today, there continue to be many demands for improved high temperature materials. New classes of materials, such as intermetallics and ceramic materials, are challenging superalloys for key applications, given the conventional wisdom that superalloys are reaching their natural entitlement level. Therefore, multiple driving forces are converging that motivate improvements in the superalloy development process. This paper concludes with a description of a new development paradigm that emphasizes creativity, development speed, and customer value that can provide superalloys that meet new needs. IntroductionThe modern world has made great use of high strength structural materials to design facilities and equipment that we cannot live without. Structural materials are the backbone of any mechanical system since they must support the loads and endure the degradation modes of the operating environment. The critical roles played by materials that reliably serve under difficult conditions is impressive. For example, electric generating plants, oil refineries, chemical processing plants, industrial furnaces, and aircraft engines all depend on nickel-based superalloys. Our industrial age could hardly exist without the capabilities enabled by these materials. But the public is generally not aware of these materials since they are specialized and oftentimes are not directly observed.The aviation industry, with its current fleet of airplanes powered by fast, fuel efficient, quiet engines, would not be possible without superalloys. Jet engines are particularly challenging for structural materials since the operating environment is hot, loads are high to minimize weight, stiffness is crucial to maintain clearances throughout the operating envelope, critical structural components are buried deep within the engine and not easily accessible for inspe...

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Joint Development of a Fourth Generation Single Crystal Superalloy

Cited by 184 publications

References 4 publications

Development of Improved Bond Coat for Enhanced Turbine Durability

Development of Improved Bond Coat for Enhanced Turbine Durability

A 5th Generation SC Superalloy with Balanced High Temperature Properties and Processability

Superalloy Technology - A Perspective on Critical Innovations for Turbine Engines

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