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cast nickel-based superalloys
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Published: 01 March 2002
Image
Published: 01 March 2002
Fig. 12.53 Scatterbands for IN-738 PC cast nickel-base superalloy with and without HIP using Larson-Miller parameter (P LM ). Note: P LM = T (C + log t ) where C = Larson-Miller constant, T = absolute temperature, t = time in h. For this plot, C = 20, T = °R
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Image
Published: 01 March 2002
Fig. 15.5 Increases in temperature-strength capability of cast nickel-base superalloys for airfoils of large utility gas turbines as a function of year of availability (about 1950–1990). Results referenced to IN-738, showing advances for polycrystalline (PC), columnar grain (CG), and single
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Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930329
EISBN: 978-1-62708-359-1
... the various types and general weldability of age-hardened nickel-base alloys. The article then discusses the composition, welding metallurgy, and properties of cast nickel-base superalloys. Finally, it provides information on the welding of dissimilar metals, filler metal selection for welding clad materials...
Abstract
Nickel-base alloys are generally used in harsh environments that demand either corrosion resistance or high-temperature strength. This article first describes the general welding characteristics of nickel-base alloys. It then describes the weldability of solid-solution nickel-base alloys in terms of grain boundary precipitation, grain growth, and hot cracking in the heat-affected zone; fusion zone segregation and porosity; and postweld heat treatments. Next, the article analyzes the welding characteristics of dissimilar and clad materials. This is followed by sections summarizing the various types and general weldability of age-hardened nickel-base alloys. The article then discusses the composition, welding metallurgy, and properties of cast nickel-base superalloys. Finally, it provides information on the welding of dissimilar metals, filler metal selection for welding clad materials and for overlay cladding, service conditions during repair, and welding procedural idiosyncrasies of cobalt-base alloys.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280211
EISBN: 978-1-62708-267-9
... exceed 0.6 in nickel-base superalloys. The γ″ phase is disk-shaped. There are insufficient alloy compositions to provide knowledge of a range for V f γ″ in γ″-hardened alloys. The microstructure for components of fixed chemistry is established by prior processing (casting, forging, etc., and heat...
Abstract
This chapter examines the effect of heat treating and other processes on the microstructure-property relationships that occur in superalloys. It discusses precipitation and grain-boundary hardening and how they influence the phases, structures, and properties of various alloys. It explains how the delta phase, which is used to control grain size in IN-718, improves strength and prevents stress-rupture embrittlement. It describes heat treatments for different product forms, discusses the effect of tramp elements on grain-boundary ductility, and explains how section size and test location influence measured properties. It also provides information and data on the physical and mechanical properties of superalloys, particularly tensile strength, creep-rupture, fatigue, and fracture, and discusses related factors such as directionality, porosity, orientation, elongation, and the effect of coating and welding processes.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280339
EISBN: 978-1-62708-267-9
... and brought to market, while both wrought and cast nickel-base superalloys became the predominant alloys of choice for the most strength-critical applications. The development of vacuum melting technology for superalloys provided for a quantum leap in capability. Oxygen (and nitrogen) reduction enhanced...
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Published: 01 March 2002
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in Total Strain-Based Strain-Range Partitioning—Isothermal and Thermomechanical Fatigue
> Fatigue and Durability of Metals at High Temperatures
Published: 01 July 2009
Fig. 6.43 Assessment of thermomechanical fatigue life prediction capability of total strain version of strain-range partitioning for cast nickel-base superalloy B-1900+Hf and wrought cobalt-base alloy Haynes 188. Source: Ref 6.27
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Image
Published: 01 March 2002
Fig. 12.4 Effect of aluminum + titanium content on the stress-rupture strength of wrought and cast nickel-base superalloys
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Image
Published: 01 June 2008
Fig. 30.12 Creep comparison of a nickel-base superalloy for different casting procedures. Alloy: Mar-M200, 205 MPa (30 ksi), 980 °C (1800 °F). Source: Ref 4
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Image
Published: 01 March 2002
Fig. B.3 As-cast IN-100 nickel-base superalloy microstructure showing white islands of γ-γ′ eutectic. 100×
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Image
Published: 01 March 2002
Fig. B.4 As-cast IN-100 nickel-base superalloy microstructure showing (A) γ-γ′ eutectic, (B) probable γ precipitate in eutectic, (C) γ matrix, and (D) γ′ precipitate in γ. Marble’s reagent; 500×
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Published: 01 March 2002
Fig. B.8 Cast Rene 220 nickel-base superalloy using dark-field electron microscopy. Showing γ″ disks with finer, less extensive γ′ in background. The specimen was electropolished and etched with methanolic 10% HCl.
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Image
Published: 01 March 2002
Fig. B.10 Cast IN-100 nickel-base superalloy microstructure after exposure at 760 °C (1400 °F) for 5000 h, showing Widmanstätten platelets of tcp sigma phase. HCl, ethanol, H 2 O 2 . 500×
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Published: 01 March 2002
Fig. B.11 Cast B-1900 nickel-base superalloy after 928 °C (1800 °F) for 400 h showing acicular M 6 C, blocky MC, and coarsened γ′ cuboids
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Published: 01 March 2002
Fig. B.12 Cast IN-100 nickel-base superalloy after 816 °C (1500 °F) for 1006 h showing coarsened γ′ cuboids, sigma platelet surrounded by γ′ envelope, and cubic (blocky) MC at top center
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Image
Published: 01 February 2005
Fig. 20.14 Yield strengths of several cast and wrought nickel-base superalloys [ International Nickel Co., 1977 , and Simmons, 1971 ]
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Image
Published: 01 March 2002
Fig. 12.21 Effect of cooling rate on stress-rupture life of a cast nickel-base superalloy at 982 °C (1800 °F)/200 MPa (29 ksi)
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Image
Published: 01 March 2002
Fig. 12.28 Effect of magnesium content on stress-rupture properties of MAR-M-002 cast nickel-base superalloy at 850 °C (1562 °F)/108 MPa (15.7 ksi)
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Published: 01 March 2002
Fig. 12.25 Effect of bismuth content and microstructure on normalized rupture life for MAR-M-002 cast nickel-base superalloy in PC (A), CGDS transverse to boundaries (B), and CGDS parallel to boundaries (C) conditions
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