Development of two rhenium- containing superalloys for single- crystal blade and directionally solidified vane applications in advanced turbine engines

Harris, Ken; Erickson, G. L.; Sikkenga, Steven L.; Brentnall, W. D.; Aurrecoechea, José M.; Kubarych, K.G.

doi:10.1007/bf02661730

Cited by 47 publications

(18 citation statements)

References 5 publications

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“…Porosity was the controlling factor for HCF crack initiation in Un-HIPed specimens, and carbide morphology determined crack initiation behavior for the modified HIPed alloys. The dramatic increases in fatigue life by HIPing indicate that reduction in porosity improves fatigue performance, a result that supports past work with CMSX-4 [13].…”

Section: High Cycle Fatiguesupporting

confidence: 85%

“…This process involves the application of hydrostatic pressure by an inert gas at elevated temperature to collapse pores. HIP treatments have been reported to be very successful at reducing or eliminating casting porosity in Ni-base superalloys [12][13][14][15]. The goal of HIPing in this study was to reduce potential crack initiation sites in order to highlight carbide morphology effects.…”

Section: Experimental Procedures and Materialsmentioning

confidence: 99%

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The Effect of Carbide Morphologies on Elevated Temperature Tensile and Fatigue Behavior of a Modified Single Crystal Ni-Base Superalloy

Wasson¹,

Fuchs²

2008

Superalloys 2008 (Eleventh International Symposium)

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Minor additions of various grain boundary strengthening elements to single crystal Ni-base superalloys have been shown to improve castability, but their effects on mechanical properties are not well understood. A comparative investigation of baseline CMSX-4 and variations modified with carbon, carbon and boron, and carbon and nitrogen has been performed. These modifications have been shown to form interdendritic MC-type carbides with different morphologies. Heat treatments resulted in the breakdown of some carbide structures into small, spherical carbide particles of similar composition to the as-cast features. Tensile and high cycle fatigue (HCF) testing was conducted at 850 o C. The three carbon-containing modifications showed lower tensile strength than the baseline due to cracking of carbides and greater porosity. Fatigue crack initiations for Un-HIPed specimens occurred at pores that were adjacent to carbides in the modifications, which in general had shorter lifetimes than the baseline. HIPing dramatically increased fatigue lifetimes for all variations. Removal of porosity resulted in crack initiations at carbides and highlighted differences in fatigue behavior for varying carbide morphologies. Script carbide networks observed in the carbon only modification exhibited significant cracking that initiated failure, limiting the fatigue lifetime. Blocky carbides in the carbon and nitrogen modification remained intact, which resulted in longer fatigue lifetimes. The intact carbides did experience de-cohesion from the γ/γ' matrix that showed signs of plastic deformation in the vicinity of carbides.

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Section: High Cycle Fatiguesupporting

confidence: 85%

Section: Experimental Procedures and Materialsmentioning

confidence: 99%

The Effect of Carbide Morphologies on Elevated Temperature Tensile and Fatigue Behavior of a Modified Single Crystal Ni-Base Superalloy

Wasson¹,

Fuchs²

2008

Superalloys 2008 (Eleventh International Symposium)

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“…high-temperature applications owing to their exceptional high-temperature capability. [1][2][3] A high-level content of alloying elements has been used to improve creep strength in recent generations of Ni-base single-crystal superalloys, such as CMSX-10, [4][5][6][7][8] for turbine blades with the introduction of refractory elements. [9][10][11] However, the additional content in new alloys caused severe solidification segregation that eventually promoted the presence of casting defects.…”

Section: Ni-base Superalloys Have Been Developed Formentioning

confidence: 99%

“…The Arrhenius plot in Eq. [8] is rearranged with respect to Eq. [3] in terms of the activity against reciprocal temperature as:…”

Section: Equations For Calculating Partial Pressure and Thermodymentioning

confidence: 99%

Vaporization of Ni, Al and Cr in Ni-Base Alloys and Its Influence on Surface Defect Formation During Manufacturing of Single-Crystal Components

Dong

Sergeev

Kobertz

et al. 2019

Metall Mater Trans A

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Vaporization and its associated surface defect formation have become one of the most important challenges in manufacturing single-crystal components. During the kinetic-influenced casting and solution heat treatment of Ni-base superalloys, elements undergo processes of vaporization and deposition causing unpredictable defects. To quantitatively examine the vaporization phenomenon, partial vapor pressures of Ni, Al and Cr in Ni-base alloys were measured in the c phase over the temperature range of 1473 K to 1650 K using Knudsen effusion mass spectrometry. Experimental results showed that the partial pressure of Al is about two orders of magnitude lower than that of Ni and five times lower than that of Cr, revealing that the vaporization of Al is almost negligible compared with those of Ni and Cr at solution heat treatment temperatures. Variation of partial pressures during homogenization of the as-cast Ni-base alloys was measured in long-term isothermal experiments at 1573 K. It was found that Cr vapor pressure decreases by a factor of two in the first 20 hours whereas the Ni and Al remain nearly constant.

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“…Paper is available on the website: www.idk.org.rs/journal enhanced high temperature mechanical properties, mainly due to elimination of grain boundaries as potential failure initiation sites. Modern SC superalloys contain high levels of refractory elements, such as Mo, W, Re in order to increase high temperature creep and rupture properties [3,4]. However, high content of these elements makes the alloys more susceptible to the formation of TCP phases during long-term service [5].…”

Section: Introductionmentioning

confidence: 99%

Classification and microstructural stability of high generation single crystal Nickel-based superalloys

Sowa¹,

Arabasz²,

Parlińska-Wojtan³

2016

Zas Mat

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Development of two rhenium- containing superalloys for single- crystal blade and directionally solidified vane applications in advanced turbine engines

Cited by 47 publications

References 5 publications

The Effect of Carbide Morphologies on Elevated Temperature Tensile and Fatigue Behavior of a Modified Single Crystal Ni-Base Superalloy

The Effect of Carbide Morphologies on Elevated Temperature Tensile and Fatigue Behavior of a Modified Single Crystal Ni-Base Superalloy

Vaporization of Ni, Al and Cr in Ni-Base Alloys and Its Influence on Surface Defect Formation During Manufacturing of Single-Crystal Components

Classification and microstructural stability of high generation single crystal Nickel-based superalloys

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