Effect of Microstructure (and Heat Treatment) on the 649�C Properties of Advanced P/M Superalloy Disk Materials

Schirra, J.J.; Reynolds, Paul L.; Huron, Eric S.; Bain, Kenneth; Mourer, D. P.

doi:10.7449/2004/superalloys_2004_341_350

Cited by 16 publications

(11 citation statements)

References 5 publications

(2 reference statements)

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“…To achieve a balance of chemistry and mechanical properties, industry leaders have developed gas atomization processes, billet extrusion and isothermal forging capabilities, and specialized thermal mechanical processing methods. 1 Strength-dependent properties are typically enhanced by the solution heat treating forgings below the gamma prime solvus (i.e., subsolvus) followed by a rapid cooling scheme. This maintains a fine grain size while solutioning a sizable fraction of the γ'.…”

Section: Introductionmentioning

confidence: 99%

P/M Alloy 10: A 700�C Capable Nickel-Based Superalloy for Turbine Disk Applications

Rice¹,

Kantzos²,

Hann³

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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The Versatile Affordable Advanced Turbine Engine (VAATE) program has been supporting the development of Alloy 10, a gasatomized powder metal (PM) superalloy. Funding for the program was provided by U.S. Air Force Research Laboratory (AFRL).Honeywell International, Rolls Royce -Allison Advanced Development Company (AADC), and Williams International have been jointly developing Alloy 10 for small and large gas turbine engine applications. Alloy 10 is a demonstrated industry leader in high temperature creep resistance, and has been produced using production-scale equipment for high pressure turbine disk applications. To address cost issues, the VAATE Alloy 10 project evaluated the relative differences between material densified by hot isostatic pressing (as-HIP) and material produced by extrusion followed by isothermal forging. The program was completed as a series of four tasks: (i) chemistry optimization, (ii) as-HIP compaction, (iii) HIP compaction plus isothermal forging for small engine applications, and (iv) extrusion plus isothermal forging for large engine applications. This report provides the status of the program, microstructures typical of the various Alloy 10 product forms, and a summary of initial mechanical properties data.

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Section: Introductionmentioning

confidence: 99%

P/M Alloy 10: A 700�C Capable Nickel-Based Superalloy for Turbine Disk Applications

Rice¹,

Kantzos²,

Hann³

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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“…The team began two parallel studies to begin the effort, one based on microstructural modification of several promising superalloys, and one based on grain boundary optimization. This paper describes the grain boundary element study while the microstructural study is described in a parallel paper in this volume 1 .…”

Section: Introductionmentioning

confidence: 99%

The Influence of Grain Boundary Elements on Properties and Microstructures of P/M Nickel Base Superalloys

Huron¹,

Bain²,

Mourer³

et al. 2004

Superalloys 2004 (Tenth International Symposium)

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A study was conducted on the influence of grain boundary elements (GBE) on several P/M nickel base superalloys. Evaluations included microstructural response to chemistry and processing, tensile, creep, rupture, and fatigue crack growth testing (FCG). Boron was found to be the most influential element in the study, with increased boron leading to increased grain boundary triple point void formation and tendency for Thermally Induced Porosity (TIP). Boron reduced creep life but increased both rupture life and rupture ductility and slightly reduced hold time crack growth rates. Carbon also influenced microstructure by slightly refining grain size, and slightly reduced creep and hold time crack growth rates. Hafnium had slight impacts on yield strength and hold time crack growth rates. Magnesium overall had negligible effects. Tantalum had several significant effects, improving creep life and reducing crack growth rates. Overall, the results confirm that careful control and optimization of grain boundary chemistries and grain boundary microstructure are necessary to achieve maximum performance of P/M superalloys.

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“…The results in present study are in agreement with findings by Schirra et.al. (9). They performed a regression analysis of various microstructural parameters in two P/M alloys and found that the size of the tertiary γ' precipitates was the best predictor of hold time crack growth behavior.…”

Section: Hold Time Crack Growth and Precipitate Size Distributionmentioning

confidence: 99%

Effect of Microstructure on Time Dependent Fatigue Crack Growth Behavior in a P/M Turbine Disk Alloy

Telesman

Gabb²,

Bonacuse

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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A study was conducted to determine the processes which govern hold time crack growth behavior in the LSHR disk P/M superalloy. Nineteen different heat treatments of this alloy were evaluated by systematically controlling the cooling rate from the supersolvus solutioning step and applying various single and double step aging treatments. The resulting hold time crack growth rates varied by more than two orders of magnitude. It was shown that the associated stress relaxation behavior for these heat treatments was closely correlated with the crack growth behavior. As stress relaxation increased, the hold time crack growth resistance was also increased.The size of the tertiary γ' in the general microstructure was found to be the key microstructural variable controlling both the hold time crack growth behavior and stress relaxation. No relationship between the presence of grain boundary M 23 C 6 carbides and hold time crack growth was identified which further brings into question the importance of the grain boundary phases in determining hold time crack growth behavior.

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Effect of Microstructure (and Heat Treatment) on the 649�C Properties of Advanced P/M Superalloy Disk Materials

Cited by 16 publications

References 5 publications

P/M Alloy 10: A 700�C Capable Nickel-Based Superalloy for Turbine Disk Applications

P/M Alloy 10: A 700�C Capable Nickel-Based Superalloy for Turbine Disk Applications

The Influence of Grain Boundary Elements on Properties and Microstructures of P/M Nickel Base Superalloys

Effect of Microstructure on Time Dependent Fatigue Crack Growth Behavior in a P/M Turbine Disk Alloy

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