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Hot gas corrosion

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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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1995
DOI: 10.31399/asm.tb.sch6.t68200298
EISBN: 978-1-62708-354-6
... Abstract This chapter provides a detailed discussion on the definitions, alloy classification, alloy selection, mechanical properties, hot gas corrosion resistance, and formability of heat-resistant high alloy steels. In addition, the applications of cast heat-resistant alloys are also...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420231
EISBN: 978-1-62708-310-2
... Abstract Gas-metal reactions can have a significant impact on metals and alloys, affecting their properties (during processing) and accelerating service failures, particularly in hot, corrosive environments. This chapter discusses the kinetics of gas-metal reactions and how they are driven...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280287
EISBN: 978-1-62708-267-9
... 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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030025
EISBN: 978-1-62708-282-2
...-temperature oxidation sulfidation carburization hydrogen effects hot corrosion corrosion protection corrosion resistance WHEN METAL IS EXPOSED to an oxidizing gas at elevated temperature, corrosion can occur by direct reaction with the gas, without the need for the presence of a liquid electrolyte...
Image
Published: 30 November 2013
Fig. 9 Hot-corrosion attack of René 77 nickel-base alloy turbine blades. (a) A land-based, first-stage turbine blade. Notice the deposit buildup and flaking and splitting of the leading edge. (b) Stationary vanes. (c) A land-based, first-stage gas turbine blade that had type 2 hot-corrosion More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490415
EISBN: 978-1-62708-340-9
... of fuel encounter corrosion problems and depend heavily on coatings for protection. In recent years the desire for fuel flexibility in turbines has led to the development of alloys for critical hot-gas-path components that constitute a compromise between strength and corrosion resistance and that hence...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430290
EISBN: 978-1-62708-253-2
... hot corrosion ( Ref 6.32 ). Hot corrosion is thus a mode of damage in which metals and alloys experience accelerated oxidation or corrosion when their surfaces are coated by a thin film of fused salts (such as Na 2 SO 4 ) in an oxidizing gas. Hot corrosion is generally initiated by sulfur. Case...
Image
Published: 01 March 2002
Fig. 13.16 Schematic illustration of the temperature and gas compositions over which hot corrosion propagation is important. Note the high rate shown at low temperatures by the gas-induced acidic fluxing More
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630237
EISBN: 978-1-62708-270-9
... attack and hot corrosion in general are equally harmful in gas turbines. The high-temperature attack occurs because of the formation of low-melting-point vanadium- or sulfur-bearing deposits that attack the coatings and the metallic component. Figure 9 shows the hot-corrosion attack of a nickel-alloy...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.ttg2.t61120123
EISBN: 978-1-62708-269-3
... by removal of atoms. It can occur by the interaction of a gas, such as oxygen, which converts the surface atoms to oxides that can adhere or be scaled off. Alternately, it can occur electrochemically as a coupled reaction between an anode and at least one cathode. The various forms of corrosion are myriad...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350231
EISBN: 978-1-62708-315-7
... on iron or steel by keep- ing the coating molten after hot dip galvanizing until the zinc alloys in- terdiffuse completely with the basis metal. gaseous corrosion. Corrosion with gas as the only corrosive agent and without any aqueous phase on the surface of the metal. Also called dry corrosion. See also...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.9781627083157
EISBN: 978-1-62708-315-7
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900153
EISBN: 978-1-62708-350-8
... 2 to 12%, they are distinguished by their principal alloying element. All can be readily processed via gas nitriding, salt bath nitriding, or ion nitriding. Forging Dies Selection of a hot-work steel grade depends on the forge die application. For many forging steel applications, the steel...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.sap.t53000111
EISBN: 978-1-62708-313-3
... that have the most impact on the selection of superalloy compositions are hot corrosion and oxidation. At moderate temperatures less than approximately 870 °C (1600 °F), and with the presence of molten salts on the alloy surface, hot corrosion becomes the major mechanism of superalloy environmental...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.sap.t53000117
EISBN: 978-1-62708-313-3
.... MAR-M 918 High-temperature sheets … MP159 Hot corrosion resistant, high-strength fasteners … MP35N Fasteners, springs, nonmagnetic electrical components and instrument parts in medical, seawater, oil and gas wells, and chemical and food processing environments Excellent resistance...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930249
EISBN: 978-1-62708-359-1
...), the weld pool, and the solidified weld bead from atmospheric contamination. Researchers have shown that gas contaminants can cause cracking, varying degrees of weld bead oxidation, arc instability, and degradation of mechanical and corrosion properties. A particular gas or gas mixture might be used because...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170495
EISBN: 978-1-62708-297-6
... (N06007), which include G-3 (N06985) and G-30 (N06039), have improved resistance to HAZ carbide precipitation, improved resistance to hot cracking, and improved weld metal bend ductility. Alloy G-50 was developed for use in sour gas environments. Other alloys in the Ni-Cr-Fe-Mo family include...
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
... of a turbine blade for a high-performance jet engine, the bulk of the material must have sufficient creep resistance and fatigue strength at the service temperature to provide an acceptably safe service life. On the other hand, the surface must possess sufficient resistance to oxidation and hot corrosion...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280323
EISBN: 978-1-62708-267-9
... from high-temperature applications of superalloys. Example 1: Gas Turbine Combustion Chamber Gas turbines require a combustion chamber in which to burn the fuel to produce the hot gases that drive the turbine. In some engines, the combustors are very large (annular combustors), and in others...