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gamma prime

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Image
Published: 01 November 2010
Fig. D.13 Light, acicular sigma phase has formed in the gamma-gamma prime matrix; some sigma is also visible at boundaries of the platelets. Optical microscope, original magnification 500×. Condition: Heat treated—solution annealed 4 h at 1175 °C (2150 °F), aged 4 h at 1080 °C (1975 °F More
Image
Published: 01 November 2010
Fig. D.3 Details of delta phase crystals. Gamma prime precipitate is visible in the gamma matrix. Replica electron micrograph, original magnification 10,000× Condition: Solution treated and aged—solution annealed 1 h at 955 °C (1750 °F), air cooled, aged 8 h at 720 °C (1325 °F), and furnace More
Image
Published: 01 November 2010
Fig. D.8 Small, uniformly dispersed gamma prime precipitate and large, discontinuous M23C6 carbide at the grain boundary. Replica electron micrograph, original magnification 15,000×. Condition: Solution treated and aged—solution annealed 2 h at 1150 °C (2100 °F) and air cooled, then aged 24 More
Image
Published: 01 November 2010
Fig. D.15 Precipitated carbide at grain boundaries and gamma prime within grains of the gamma solid-solution matrix. Replica electron micrograph, original magnification 4500×. Condition: Solution treated and aged—solution annealed 4 h at 1175 °C (2150 °F) and aged 24 h at 980 °C (1800 °F More
Image
Published: 01 October 2011
Fig. 14.18 Gamma prime (γ′) phase in superalloy forging (Astroloy) at three different magnifications. (a) 100×. (b) 1000×. (c) 10,000×. The forging was solution annealed at 1150 °C for 4 h, air cooled, aged at 1080 °C for 4 h, oil quenched, aged at 845 °C for 4 h, air cooled, aged at 760 °C More
Image
Published: 01 December 1989
Fig. 9.40. Gamma-prime overaging and associated loss of creep strength in Udimet 710 tested at 845 °C and 350 MPa (1555 °F and 50 ksi) ( Ref 70 ; courtesy of P. Lowden, Liburdi Engineering, Ltd., Burlington, Canada). Top: New creep life, 140 h. Bottom: Service, 45,000 h; creep life, 10 h. More
Image
Published: 01 December 1989
Fig. 9.41. Gamma-prime particle size as a function of t 1/3 (t is time of thermal exposure) for superalloys (based on Ref 7 , 8 , 64 , and 69 ). More
Image
Published: 01 February 2005
Fig. 16.6 Prediction of the distribution of the size (μm) of gamma prime for a Rene 88 experimental forging More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.sap.t53000139
EISBN: 978-1-62708-313-3
...: Heat treated (solution annealed 2 h at 1095 °C (2000 °F), air cooled, reannealed 1 h at 980 °C (1800 °F), air cooled, aged 16 h at 720 °C (1325 °F), air cooled) Source: Ref 1 , 2 Fig. D.3 Details of delta phase crystals. Gamma prime precipitate is visible in the gamma matrix. Replica...
Image
Published: 01 November 2010
Fig. D.6 The needlelike constituent is eta phase (Ni3Ti); the remainder of the structure is gamma prime in a gamma matrix. Negative-replica electron micrograph, original magnification 15,000×. Condition: Miscellaneous condition(s)—creep tested to rupture at 138 MPa (20 ksi) for 7380 h More
Image
Published: 01 November 2010
Fig. D.14 Structure is acicular sigma phase, M23C6 carbide at grain boundary, and gamma prime within the gamma matrix grains. Optical microscope, original magnification 4500×. Condition: Solution treated and aged—solution annealed 4 h at 1175 °C (2150 °F) and aged 1500 h at 815 °C (1500 °F More
Image
Published: 01 November 2010
Fig. D.7 The grain-boundary constituents (MC, M3B2, or both) contributed to low ductility. Note the grain-boundary depleted zone. The gamma matrix contains gamma prime precipitate. Replica electron micrograph, original magnification 10,000×. Condition: Heat treated—solution annealed 2 h More
Image
Published: 01 November 2010
Fig. D.9 Grain-boundary M23C6 carbide is stabilized, and precipitation of fine gamma prime particles has increased. Replica electron micrograph, original magnification 15,000×. Condition: Solution treated and aged—solution annealed 2 h at 1150 °C (2100 °F) and air cooled, then aged 24 h More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040193
EISBN: 978-1-62708-300-3
.... The development and utilization of physical metallurgy-based microstructure models and the integration of the models with finite-element analysis has allowed for microstructure prediction by computer. Two important microstructural features of superalloy forgings are the grain size and the gamma-prime...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230179
EISBN: 978-1-62708-298-3
... at.% or 3 wt%. There are two congruent melting phases: The beta phase, with a cesium chloride-ordered cubic structure, melts at 1420 °C (2590 °F), and the gamma phase melts at 1400 °C (2550 °F). Gamma and gamma prime are closely related, with gamma being a disordered version of gamma prime. There are two...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280025
EISBN: 978-1-62708-267-9
... prime gamma prime microstructure superalloys Groups, Crystal Structures, and Phases Superalloy Groups As noted earlier, there are three groups of superalloys (iron-nickel-, nickel-, and cobalt-base), which are further subdivided into cast and wrought (where wrought includes powder...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900065
EISBN: 978-1-62708-350-8
... surface etches out white in appearance above the nitrided case. The zone is called “compound” due to the presence of more than one phase ( Fig. 1 ). Two phases generally are present in the compound zone: the epsilon (ε) phase, which has a chemical formula of Fe 2-3 N, and the gamma prime (γ′) phase, which...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310001
EISBN: 978-1-62708-286-0
... 6 fcc a = 10.57–10.68 Cr 16 Fe 5 Mo 2 C (e.g.) M 23 (C,B) 6 fcc a = 10.57–10.68 Cr 23 (C,B) 6 M 6 C Diamond cubic a = 10.62–11.28 (FeCr) 21 Mo 3 C; Fe 3 Nb 3 C; M 5 SiC M 2 N Hexagonal a = 2.8 c = 4.4 Cr 2 N MN Cubic a = 4.13–4.18 CrN Gamma prime fcc...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900193
EISBN: 978-1-62708-350-8
... surface. This is accomplished by changing the nature of the surface compound layer, which is also known as the white layer. The completed compound layer will form with both epsilon (ε) and gamma prime (γ′) phases. The dominant ε-phase resists abrasive wear. Ferritic nitrocarburizing improves...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550299
EISBN: 978-1-62708-307-2
...-two + gamma) or three-phase (alpha-two + gamma + beta) near-gamma titanium aluminide alloys during ingot breakdown and/or rolling suggests that these materials may be prime candidates for superplastic forming. Materials were tested over a wide range of temperatures and strain rates. For most...