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cobalt-base alloys
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Published: 01 November 2007
Fig. 7.31 Corrosion of cobalt-base alloys (alloys 188 and 6B) and cobalt-containing alloys (alloys 556, N155, RV-18, and RV-19) in the MPC coal gasification atmosphere with 1.0 and 1.5% H 2 S (see Tables 7.4 and 7.5 for gas composition). Source: Ref 60
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Published: 01 November 2007
Fig. 7.33 Corrosion of Fe-Cr-Ni, nickel-base, and cobalt-base alloys at 980 °C (1800 °F) in the MPC coal gasification atmosphere with 0.5% H 2 S (see Tables 7.4 and 7.5 for gas composition). Source: Ref 67
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Image
Published: 01 November 2007
Fig. 4.27 Effect of the Ni + Co content in iron-, nickel-, and cobalt-base alloys on nitridation resistance at 650 °C (1200 °F) for 168 h in ammonia (100% NH 3 in the inlet gas and 30% NH 3 in the exhaust). Source: Ref 41
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Published: 01 November 2007
Fig. 4.28 Effect of the Ni + Co content in iron-, nickel-, and cobalt-base alloys on nitridation resistance at 980 °C (1800 °F) for 168 h in ammonia (100% NH 3 in the inlet gas and <5% NH 3 in the exhaust). Source: Ref 41
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in Corrosion by Halogen and Hydrogen Halides
> High-Temperature Corrosion and Materials Applications
Published: 01 November 2007
Fig. 6.24 Corrosion of several nickel- and cobalt-base alloys in Ar-20O 2 -1Cl 2 at 900 °C (1650 °F). Source: Ref 35
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Published: 01 November 2007
Fig. 7.38 Corrosion of iron-, nickel-, and cobalt-base alloys after 215 h at (a) 760 °C (1400 °F), (b) 870 °C (1600 °F), and (c) 980 °C (1800 °F) in Ar-5H 2 -5CO-1CO 2 -0.15H 2 S. Source: Ref 71
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Published: 01 November 2007
Fig. 9.1 Relative hot corrosion resistance of cobalt-base alloys obtained from burner rig tests using 3% S residual oil and 325 ppm NaCl in fuel (equivalent to 5 ppm NaCl in air) at 870 °C (1600 °F) for 600 h. Source: Beltran ( Ref 21 )
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Published: 01 November 2007
Fig. 9.2 Relative hot corrosion resistance of nickel- and cobalt-base alloys obtained from burner rig tests at 870, 950, and 1040 °C (1600, 1750, and 1900 °F) for 100 h, using 1% S diesel fuel, 30:1 air-to-fuel ratio, and 200 ppm sea-salt injection. Source: Bergman et al. ( Ref 22 )
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Published: 01 December 1989
Fig. 4.40. Comparative resistances of nickel- and cobalt-base alloys to thermal-stress fatigue ( Ref 144 ).
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Published: 01 June 2008
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Published: 01 October 2011
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Published: 01 November 2012
Fig. 14 Creep damage (bowing) of a cobalt-base alloy turbine vane from overheating. Source: Ref 1
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Published: 01 June 2008
Fig. 29.15 Microstructures of cobalt-base wear-resistant alloys. GTAW, gas tungsten arc welding. Source: Ref 10
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Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240563
EISBN: 978-1-62708-251-8
... Abstract Superalloys are nickel, iron-nickel, and cobalt-base alloys designed for high-temperature applications, generally above 540 deg C. This chapter covers the metallurgy, composition, and properties of cast and wrought superalloys. It provides information on melting, heat treating...
Abstract
Superalloys are nickel, iron-nickel, and cobalt-base alloys designed for high-temperature applications, generally above 540 deg C. This chapter covers the metallurgy, composition, and properties of cast and wrought superalloys. It provides information on melting, heat treating, and secondary fabrication processes. It also covers coating technology, including aluminide diffusion and overlay coatings, and addresses the advantages and disadvantages of superalloys in various applications.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080249
EISBN: 978-1-62708-304-1
... Abstract This chapter examines the hot corrosion resistance of various nickel- and cobalt-base alloys in gas turbines susceptible to high-temperature (Type I) and low-temperature (Type II) hot corrosion. Type I hot corrosion is typically characterized by a thick, porous layer of oxides...
Abstract
This chapter examines the hot corrosion resistance of various nickel- and cobalt-base alloys in gas turbines susceptible to high-temperature (Type I) and low-temperature (Type II) hot corrosion. Type I hot corrosion is typically characterized by a thick, porous layer of oxides with the underlying alloy matrix depleted in chromium, followed (below) by internal chromium-rich sulfides. Type II hot corrosion is characterized by pitting with little or no internal attack underneath. As the chapter explains, chromium additions make alloys more resistant to all types of hot corrosion attacks.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080445
EISBN: 978-1-62708-304-1
... Abstract This appendix is a collection of tables listing the chemical compositions of wrought ferritic steels; wrought stainless steels; cast corrosion- and heat-resistant alloys; wrought iron-, nickel-, and cobalt-base alloys; cast nickel- and cobalt-base alloys; oxide-dispersion-strengthened...
Abstract
This appendix is a collection of tables listing the chemical compositions of wrought ferritic steels; wrought stainless steels; cast corrosion- and heat-resistant alloys; wrought iron-, nickel-, and cobalt-base alloys; cast nickel- and cobalt-base alloys; oxide-dispersion-strengthened alloys; and iron-, nickel- and cobalt-base filler metals.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280079
EISBN: 978-1-62708-267-9
... patterns, molds, and shells are produced, discusses the practice of directional solidification, and examines an assortment of turbine components cast from nickel- and cobalt-base alloys. The chapter also addresses casting problems such as inclusions, porosity, distortion, core shift, and leaching...
Abstract
This chapter discusses the application of investment casting to nickel- and cobalt-base superalloys. It describes the production of polycrystalline and single crystal castings, the materials normally used, and the part dimensions and tolerances typically achieved. It explains how patterns, molds, and shells are produced, discusses the practice of directional solidification, and examines an assortment of turbine components cast from nickel- and cobalt-base alloys. The chapter also addresses casting problems such as inclusions, porosity, distortion, core shift, and leaching and explains how to avoid them.
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2021
DOI: 10.31399/asm.tb.tpsfwea.t59300227
EISBN: 978-1-62708-323-2
... they are subjected to liquid, droplet, and solid particle erosion. It also discusses the tribology of nickel- and cobalt-base alloys as well as titanium, zinc, tin, aluminum, magnesium, beryllium, graphite, and different types of wood. alloy composition cobalt-base alloys corrosion-resistant metals friction...
Abstract
This chapter covers the tribological properties of stainless steel and other corrosion-resistant alloys. It describes the metallurgy and microstructure of the basic types of stainless steel and their suitability for friction and wear applications and in environments where they are subjected to liquid, droplet, and solid particle erosion. It also discusses the tribology of nickel- and cobalt-base alloys as well as titanium, zinc, tin, aluminum, magnesium, beryllium, graphite, and different types of wood.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170540
EISBN: 978-1-62708-297-6
... and carbides affect toughness, hardness, ductility, and strength as well as resistance to heat, corrosion, and wear. cobalt-base corrosion-resistant alloys cobalt-base heat resistant alloys cobalt-base wear-resistant alloys Composition Introduction and Overview Elemental Cobalt Falling...
Abstract
This article discusses the properties, behaviors, and uses of cobalt and its alloys. It explains how cobalt alloys are categorized and describes the commercial designations and grades that are available. It also provides composition information and explains how alloying elements and carbides affect toughness, hardness, ductility, and strength as well as resistance to heat, corrosion, and wear.
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
... and for overlay cladding, service conditions during repair, and welding procedural idiosyncrasies of cobalt-base alloys. chemical composition fusion zone segregation grain boundary precipitation grain growth heat treatment heat-affected zone hot cracking nickel alloys porosity weldability...
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.
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