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overlay coatings
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in Surface Engineering to Add a Surface Layer or Coating
> Surface Engineering for Corrosion and Wear Resistance
Published: 01 March 2001
Fig. 8 Volume steady-state erosion rates of weld-overlay coatings at 400 °C (750 °F) as a function of average microhardness at 400 °C (90° impact angle; alumina erodent). Source: Ref 45
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Image
Published: 01 March 2002
Fig. 13.19 Typical MCrAlY overlay coating. Gray phase is CoAl or NiAl dispersed in white nickel or cobalt solid solution
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Image
Published: 01 March 2002
Fig. 13.25 Ductility of several MCrAlY overlay coating compositions showing role of cobalt and chromium on ductility. Also, the figure shows the relative ductility of NiCrAlY and CoCrAlY coatings.
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Published: 01 March 2002
Fig. 13.20 Ductility of CoCrAlY overlay and standard diffused aluminide coatings showing ductility improvements possible with appropriate overlay compositions
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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
..., 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. cast nickel-based superalloys wrought nickel alloys wrought cobalt-based superalloys cast...
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 March 2002
DOI: 10.31399/asm.tb.stg2.t61280287
EISBN: 978-1-62708-267-9
... protective coatings, including aluminide diffusion, overlay, and thermal barrier types, and how they perform in different environments based on their ability to tolerate strain. coatings corrosion resistance corrosion testing hot corrosion superalloys Overview Introduction Elevated...
Abstract
Superalloys tend to operate in environments where they are subjected to high-temperature corrosion, oxidation, and the erosive effects of hot gases. This chapter discusses the nature of these attacks and the effectiveness of various protection methods. It describes the primary forms of oxidation, the development of protective oxides, and the conditions associated with mixed gas corrosion and hot corrosion attack. It discusses oxidation and corrosion testing, the equipment used, and various ways to present the associated data. It describes the effect of gaseous oxidation on different alloys, discusses the formation of oxide scale in the presence of mixed gases, and explains how alloy composition contributes to oxide growth. The chapter discusses the underlying chemistry of hot corrosion, how to identify its effects, and how it progresses under various conditions. It also discusses protective coatings, including aluminide diffusion, overlay, and thermal barrier types, and how they perform in different environments based on their ability to tolerate strain.
Image
Published: 01 June 1985
Fig. 4-35. Tooth bending impact with stress-coat overlay, showing fracture path short-circuiting the usual stress flow-lines.
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Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350125
EISBN: 978-1-62708-315-7
... overlays, thermal spraying, and various deposition technologies. ceramic coating chemical vapor deposition cladding corrosion resistance electroless plating electroplating hot dip metallic coating physical vapor deposition thermal spraying weld overlays THE SURFACE-ENGINEERING METHODS...
Abstract
This chapter discusses the use of coating methods and materials and their impact on corrosion and wear behaviors. It provides detailed engineering information on a wide range of processes, including organic, ceramic, and hot dip coating, metal plating and cladding, and the use of weld overlays, thermal spraying, and various deposition technologies.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2013
DOI: 10.31399/asm.tb.mfub.t53740325
EISBN: 978-1-62708-308-9
... Abstract This chapter covers a wide range of finishing and coating operations, including cleaning, honing, polishing and buffing, and lapping. It discusses the use of rust-preventative compounds, conversion coatings, and plating metals as well as weld overlay, thermal spray, and ceramic...
Abstract
This chapter covers a wide range of finishing and coating operations, including cleaning, honing, polishing and buffing, and lapping. It discusses the use of rust-preventative compounds, conversion coatings, and plating metals as well as weld overlay, thermal spray, and ceramic coatings and various pack cementation and deposition processes. It also discusses the selection and use of industrial paints and paint application methods.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080259
EISBN: 978-1-62708-304-1
... that most of the coal ash is captured to form a molten slag that coats the inside surface of the Cyclone barrels ( Ref 1 ). The combustion flue gas from the Cyclone barrels then enters the main furnace to generate steam. Stoker-firing boilers are very versatile for burning a wide range of solid fuels...
Abstract
This chapter discusses material-related problems associated with coal-fired burners. It explains how high temperatures affect heat-absorbing surfaces in furnace combustion areas and in the convection pass of superheaters and reheaters. It describes how low-NOx combustion technology, intended to reduce NOx emissions, accelerates tube wall wastage. It also covers circumferential cracking in furnace waterwalls, thermal fatigue cracking induced by waterlances and water cannons, superheater-reheater corrosion, and erosion in fluidized-bed boilers.
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080003
EISBN: 978-1-62708-304-1
.... The coatings used involve aluminide coatings, overlay MCrAlY coatings by vapor deposition processes (e.g., electron beam physical vapor deposition), and ceramic thermal barrier coatings (e.g., stabilized ZrO 2 ). Coatings are considered sacrificial and are to be replaced periodically. ...
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080335
EISBN: 978-1-62708-304-1
... of all the coating material in preparation for overlay welding with alloy 625 later was found to be an arduous and time-consuming operation ( Ref 7 ). 12.6 Corrosion Protection for Superheaters Metal temperatures for superheater tubes can be 370 to 480 °C (700 to 900 °F) or higher...
Abstract
Managing corrosion continues to be a challenge for operators of modern boilers worldwide. This chapter addresses the corrosion-related problems that can occur in boilers burning municipal solid waste (MSW). It describes corrosion mechanisms associated with different environments and alloys. It also discusses corrosion protection methods for furnace waterwalls and superheater tubes in waste-to-energy boilers.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350183
EISBN: 978-1-62708-315-7
... Table 14 Compares the characteristics of various weld overlay coatings Table 15 Compares the applications of thermal spraying, welding, and electroplating Table 16 Compares the process requirements in thermal spraying, welding, and electroplating Table 17 Compares the design...
Abstract
This chapter compares and contrasts surface-engineering processes based on process availability, corrosion and wear performance, distortion effects, penetration depth or attainable coating thickness, and cost. It provides both quantitative and qualitative information as well as measured property values.
Image
Published: 01 November 2007
Fig. 10.92 Spallation of the thermal sprayed coating on the bottom surface of the test tube sample after exposure for 14,021 h as part of the in-bed evaporator tubes in a 130 MW(e) bubbling fluidized-bed boiler. The coating was applied to alloy 625 overlay, which acted as a butter layer
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Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1995
DOI: 10.31399/asm.tb.sch6.t68200369
EISBN: 978-1-62708-354-6
... Abstract This chapter covers the basics of weldability of cast steels such as carbon and low alloy steels, corrosion-resistant high alloy steels, nickel-base alloys, heat-resistant high alloy steels, and wear-resistant high austenitic manganese steels. It provides an overview of weld overlay...
Abstract
This chapter covers the basics of weldability of cast steels such as carbon and low alloy steels, corrosion-resistant high alloy steels, nickel-base alloys, heat-resistant high alloy steels, and wear-resistant high austenitic manganese steels. It provides an overview of weld overlay and hard facing; cast-weld construction; and plasma arc cutting and plasma arc welding. The chapter discusses different types of welding processes. These include shielded metal-arc welding, air carbon arc cutting process, gas tungsten-arc welding, gas metal-arc welding process, flux-cored arc welding, submerged arc welding, and electroslag and electro-gas welding.
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
...-modified corrosion. Aluminide diffusion coatings were applied with increasing frequency, and MCrAlY-type (where M = metal such as Fe, Ni, Co or combinations thereof) overlay coatings were developed for commercial use. Substantial increases in life at engine operating temperatures and the minimization...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.9781627083041
EISBN: 978-1-62708-304-1
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.9781627082679
EISBN: 978-1-62708-267-9
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460277
EISBN: 978-1-62708-285-3
..., the new-make product has undergone upgrades in design and therefore proves to be very expensive to replace. The best alternative is an overlay coating that can provide the product upgrade with superior properties and with no major detriment to the substrate properties, via the cold spray technique...
Abstract
This chapter focuses on high-pressure cold spray applications pertaining to repair and refurbishment in the aerospace, oil and gas, and power-generation industries, the last specifically involving repair of gas turbine components. Advantages of cold spray coating in the repair and refurbishment of structural engineering components are also discussed.
Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240395
EISBN: 978-1-62708-251-8
... coatings, and boronizing. surface hardening steel pack carburizing liquid carburizing gas carburizing vacuum carburizing plasma carburizing gas nitriding liquid nitriding carbonitriding hardfacing flame hardening induction hardening aluminizing siliconizing chromizing titanium carbide...
Abstract
This chapter discusses the process characteristics, advantages, disadvantages, and applications of various processes involved in surface hardening of steel. These include pack carburizing, liquid carburizing, gas carburizing, vacuum carburizing, plasma carburizing, gas nitriding, liquid nitriding, carbonitriding, and hardfacing. The chapter describes two surface hardening processes by localized heat treatment: flame hardening and induction hardening. It also briefly summarizes other surface hardening processes, namely, aluminizing, siliconizing, chromizing, titanium carbide coatings, and boronizing.
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