MAR M 247 Derivations - CM 247 LC DS Alloy and CMSX Single Crystal Alloys: Properties &amp; Performance

Harris, Ken; Erickson, G. L.; Schwer, R. E.

doi:10.7449/1984/superalloys_1984_221_230

Cited by 87 publications

(75 citation statements)

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“…[6][7][8] The alloy is a modified superalloy based on the chemical composition of Mar-M247, specifically designed for fabricating directionally solidified (DS) turbine blades. The authors' previous study 9) indicated that, when the casting parameters are wellcontrolled, the CM 247 LC superalloy has an excellent castability that can be exploited form an equiaxed grain structure, with high strength and superior creep resistance.…”

Section: Introductionmentioning

confidence: 99%

Effect of Solution-Treatment on Microstructure and Mechanical Properties of Cast Fine-Grain CM 247 LC Superalloy

Huang

Koo

2004

Mater. Trans.

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This study investigates the effect of the solution-treatment, with solution temperatures from 1494 to 1533 K, on the microstructure and mechanical properties of fine-grain (65 mm) CM 247 LC superalloy. Tensile tests reveal that the yield strength of the alloy after multi-step 1527 K/2 h solution-treatment exceeds that after 1494 K/2 h solution-treatment. Additionally, the alloy after multi-step 1527 K/2 h solutiontreatment had a lower creep rate and greater rupture life than that after 1494 K/2 h solution-treatment. The improved mechanical properties are attributed to the high volume fraction of 0 particles with the proper size and the refinement of carbides, which inhibit the gliding and climbing of dislocations.

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Section: Introductionmentioning

confidence: 99%

Effect of Solution-Treatment on Microstructure and Mechanical Properties of Cast Fine-Grain CM 247 LC Superalloy

Huang

Koo

2004

Mater. Trans.

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“…16) [8]. Surprisingly, CMSX-7 alloy 17002-p.4 rupture life is similar to Rene' N5/N515 alloy data despite the absence of Re in CMSX-7 (Fig.…”

Section: Mechanical Propertiesmentioning

confidence: 65%

New single crystal superalloys – overview and update

Wahl¹,

Harris²

2014

MATEC Web of Conferences

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Abstract. Single crystal (SX) superalloys have wide application in the high pressure turbine section of aero and industrial gas turbine engines due to the unique combination of properties and performance. Since introduction of single crystal casting technology, SX alloy development has focused on increased temperature capability, and major improvements in alloy performance have been associated with the introduction of new alloying elements, including rhenium (Re) and ruthenium (Ru). 3% Re-containing second generation alloys have seen the greatest market utilization and have become the benchmark alloys for comparing new alloy developments. However, Re and Ru are rare elements with limited production/availability and corresponding high costs. This has resulted in significant escalation of SX alloy costs, resulting in much interest in the development of improved SX superalloys with lower Re or no Re content compared to second generation alloys. Cannon-Muskegon R has developed two new SX superalloys: 1.5% Re CMSX R -8 alloy and CMSX R -7 alloy, which contains no Re, as alternatives to first and second generation alloys for applications which require slightly less ultra high temperature capability compared to current alloys. This paper provides an overview of development and characterization of these SX alloys, including an update on recent results.

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“…However, one p u z z l i n g f e a t u r e was t h a t t h e m i c r o s t r u c t u r a l d i f f e r e n c e s between t h e two y l morphologies i n F i g . 6 …”

Section: T Was P O S T U L a T E D T H A T D I S L O C A T I O N Bymentioning

confidence: 99%

Microstructure-Property Relationships in Directionally Solidified Single-Crystal Nickel-Base Superalloys

MacKay

Nathal

1988

MiCon 86: Optimization of Processing, Properties, and Service Performance Through Microstructural Control

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This paper discusses some of the microstructural features which influence the creep properties of directionally solidified and single-crystal nickel-base superalloys. Gamma prime precipitate size and morphology, γ-γ' lattice mismatch, phase instability, alloy composition, and processing variations are among the factors considered. Recent experimental results are reviewed and related to the operative deformation mechanisms and to the corresponding mechanical properties. Special emphasis is placed on the creep behavior of single-crystal superalloys at high temperatures, where directional γ' coarsening is prominent, and at lower temperatures, where γ' coarsening rates are significantly reduced. It can be seen that very subtle changes in microstructural features can have profound effects on the subsequent properties of these materials.

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MAR M 247 Derivations - CM 247 LC DS Alloy and CMSX Single Crystal Alloys: Properties & Performance

Cited by 87 publications

References 0 publications

Effect of Solution-Treatment on Microstructure and Mechanical Properties of Cast Fine-Grain CM 247 LC Superalloy

Effect of Solution-Treatment on Microstructure and Mechanical Properties of Cast Fine-Grain CM 247 LC Superalloy

New single crystal superalloys – overview and update

Microstructure-Property Relationships in Directionally Solidified Single-Crystal Nickel-Base Superalloys

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