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high-temperature degradation

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780146
EISBN: 978-1-62708-281-5
..., namely plasticization, solvation, swelling, environmental stress cracking, polymer degradation, surface embrittlement, and temperature effects. chemical susceptibility thermal oxidative degradation photo-oxidative degradation environmental corrosion chemical corrosion plasticization solvation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.omfrc.t53030237
EISBN: 978-1-62708-349-2
... properties of a composite part. Thermo-oxidative degradation begins at the surface and progresses further into a composite part with time. The depth of the oxidative degradation (thermo-oxidation) is a function of the exposure temperature, the length of time of thermal exposure, and the chemistry...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490415
EISBN: 978-1-62708-340-9
... or redistribution of phases can degrade high-temperature creep strength, result in embrittlement, or render the alloy more susceptible to localized corrosion. Obviously, different alloys have different sensitivities to such changes; it is suspected that Udimet 710 is one of the alloys more susceptible to this form...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870401
EISBN: 978-1-62708-314-0
... for compression strength in Fig. 15.19 . Matrix degradation is usually measured in terms of weight loss. A primary measure of the TOS of PMR-15 and other high-temperature composite materials is the percentage weight loss as a function of aging time and temperature ( Fig. 15.20 ). Fig. 15.19 Compression...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430149
EISBN: 978-1-62708-253-2
... Abstract Boiler tubes operating at high temperatures under significant pressure are vulnerable to stress rupture failures. This chapter examines the cause, effect, and appearance of such failures. It discusses the conditions and mechanisms that either lead to or are associated with stress...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110524
EISBN: 978-1-62708-247-1
... on the order of nanoamps (nA), with very low minority carrier concentrations. Thus we need not worry about growth of dark-line defects. Contact degradation and corrosion are more relevant problems. They can usually be easily detected in high temperature reverse-bias tests and biased 85/85 tests, respectively...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610327
EISBN: 978-1-62708-303-4
... degrade and eventually char if heated to high enough temperatures. Many thermoplastics are polymerized by what is called chain polymerization, as shown in Fig. 15 for the simple thermoplastic polyethylene. Chain polymerization consists of three steps: initiation, propagation, and termination. During...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780359
EISBN: 978-1-62708-281-5
... methods or experiments involving high-pressure oxygen or air exposure. Such evaluations usually measure the oxidative induction time or the temperature at which oxidation initiates under the experimental conditions. This can be used to compare two similar materials or to determine whether a plastic resin...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280287
EISBN: 978-1-62708-267-9
.... Deposit-modified high-temperature corrosion is usually called hot corrosion. It is an important means of superalloy degradation and, as noted later, may have names attached to specific forms of the deposit-modified corrosive attack. Elevated-temperature oxidation is not the only surface degradation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280323
EISBN: 978-1-62708-267-9
... Abstract This chapter discusses the failure of superalloy components in high-temperature applications where they are subject to the effects of microstructural changes, melting, and corrosion. It explains how overheating can deplete alloying elements and alter the composition and distribution...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110545
EISBN: 978-1-62708-247-1
... the IV characteristic with one cell at 50% output. If all cells degrade equally such as occurs with light induced degradation then the current output of the full module degrades as shown in Figure 1(d) . Degradation of a contact can cause very high resistance (greater than a few ohms) then the series...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050293
EISBN: 978-1-62708-311-9
... Abstract This chapter discusses the maintenance needs of major components in induction heat-treating systems, including power supplies, heat stations, capacitors, high-frequency output stages, induction coils, water systems, quench systems, and fixturing. induction heating systems...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780153
EISBN: 978-1-62708-281-5
... to degradation in plastics include temperature variations, moisture, sunlight, oxidation, microbiologic attack, and other environmental elements. The article also describes the tests used to predict the behavior of a plastic material to outdoor exposure, discussing the use of xenon arc lamp for the weatherometer...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030148
EISBN: 978-1-62708-282-2
... high pressures of hydrogen near room temperature. Microperforation occurs predominately in steels. This form of hydrogen damage manifests itself as a network of small fissures that allows permeation of the alloy by gases and liquids. Degradation in Flow Properties Degradation in flow properties...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870063
EISBN: 978-1-62708-314-0
..., and then cooled. Since thermoplastics do not crosslink, they may be subsequently reheated for forming or joining operations; however, due to their inherently high viscosity and high melting points, high temperatures and pressures are normally required for processing. Fig. 3.1 Comparison of thermoset...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780314
EISBN: 978-1-62708-281-5
... to give measurable T g s for resins having a very high cross-link density, in particular, some of the aerospace epoxy resins. Differential scanning calorimetry comparison of glass transition temperature (<italic>T</italic><sub>g</sub>) results from sealed and unsealed pans Table 3 Differential...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.9781627083409
EISBN: 978-1-62708-340-9
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870373
EISBN: 978-1-62708-314-0
... by the relative humidity (RH). At 60 percent RH, the equilibrium moisture of Kevlar 49 fiber is about four percent. The gain of moisture is completely reversible and, once removed, produces no permanent property changes. At cryogenic temperatures, the modulus increases slightly and the strength is not degraded...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430409
EISBN: 978-1-62708-253-2
... information about the microstructural degradation that the tube has undergone over a period of time due to its exposure to high-pressure, high-temperature conditions and corrosive environments. Microstructural changes such as the spheroidization of carbides in pearlite, bainite breakup, precipitation...
Book Chapter

By J. W. Ekin
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1983
DOI: 10.31399/asm.tb.mlt.t62860465
EISBN: 978-1-62708-348-5
... of these areas is provided at the end. 13.2 Critical Temperature The temperature marking the onset of superconductivity is called the critical temperature of the material, T c . It is characterized by a sudden drop in the resistivity of the material from a relatively high value (~10 μ Ω·cm...