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thermal diffusivity

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230027
EISBN: 978-1-62708-298-3
... coefficient of thermal expansion crystal structure enthalpy heat capacity nuclear properties physical properties thermal conductivity thermal diffusivity vapor pressure References Armstrong R.W. , and Borch N.R. , 1971 . “ Thermal Microstresses in Beryllium and...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410335
EISBN: 978-1-62708-265-5
.... This chapter describes the conditions that must be met for martensite to form. It discusses the role of quenching and the factors that affect cooling rate, including heat transfer, thermal diffusivity, emissivity, and section size. It defines hardenability and explains how to quantify it using the...
Series: ASM Technical Books
Publisher: ASM International
Published: 23 January 2020
DOI: 10.31399/asm.tb.stemsem.t56000020
EISBN: 978-1-62708-292-1
... gold films, carbon nanotubes, zeolite sheets, and monolayer graphene. It also describes emerging techniques, including four-dimensional STEM, thermal diffuse scattering, energy filtering, aberration correction, and atomic resolution imaging. diffraction imaging scanning electron microscopy (SEM...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smfpa.t53500317
EISBN: 978-1-62708-317-1
... hardening, case (surface) hardening, and nitriding as well as hard chrome plating, vapor deposition, and thermal diffusion coating. It explains how to measure wear resistance using various tests and provides guidelines for selecting tool materials, treatments, and coatings. chemical vapor deposition...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240063
EISBN: 978-1-62708-251-8
... liquids is still rapid, it is much slower than in gases, and in solids, it is even slower. In solids, atomic movements are restricted by the crystal lattice. However, thermal vibrations in solids allow atoms to diffuse, and as the temperature increases, the vibrations of the atoms about their equilibrium...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780115
EISBN: 978-1-62708-281-5
... Abstract This article covers the thermal analysis and thermal properties of engineering plastics with respect to chemical composition, chain configuration, and/or conformation of the base polymers. The thermal analysis techniques covered are differential scanning calorimetry, thermogravimetric...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780295
EISBN: 978-1-62708-281-5
... cracks that diminish mechanical properties. Thermal stresses are largely a consequence of high coefficients of thermal expansion and low thermal diffusivities. These effects, which are exacerbated when there is a large difference between the glass transition temperature, T g , and the ambient...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310161
EISBN: 978-1-62708-286-0
... minimum required for thermal uniformity also cause problems as any sulfur and oxygen impurities are rejected from austenite and can diffuse to grain boundaries, where they form weak, plastic films that also degrade hot workability. Grain growth, by reducing grain boundary area, exacerbates this effect...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110209
EISBN: 978-1-62708-247-1
... failure analysis drastically. The emissivity contrast, which obscures the thermal contrast in conventional IR thermography, can be avoided in LIT by displaying the phase image or the 0°/-90° image in a 2-phase measurement. Due to its dynamic nature, lateral heat diffusion (blurring) is considerably...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780089
EISBN: 978-1-62708-281-5
... technique and its value to the thermoset resin field. Epoxy resins are emphasized in the examples because they dominate the airframe and aerospace industries. The article also provides information on two categories of characterization of the processing behavior of thermoset. The first studies the thermal...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1999
DOI: 10.31399/asm.tb.cmp.t66770171
EISBN: 978-1-62708-337-9
... content case hardness contact fatigue core hardness quenching refrigeration retained austenite tempering wear resistance Thermal treatments, such as tempering and refrigeration (subzero cooling), performed on case-hardened parts subsequent to quenching are considered necessary by some to...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.smnm.t52140063
EISBN: 978-1-62708-264-8
... thermal vibrations increases, and it becomes increasingly probable that a given carbon atom will jump to a nearby empty site. Fig. 7.2 (a) The iron-carbon phase diagram, indicating that iron can dissolve up to 1.3% C at 925 °C (1700 °F). (b) The diffusion of carbon into pure iron. As the carbon...
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...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310001
EISBN: 978-1-62708-326-3
... oscillating (“sitting”) on a regular lattice site has enough thermal energy to jump the gap to a vacant site nearby. This vacancy diffusion process is a fundamental mechanism of atomic motion and is the most common mechanism for atomic diffusion in solids. The presence of vacancies is a condition of...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230131
EISBN: 978-1-62708-298-3
... resistance, and density. It explains how beryllide intermetallics are formed using sputter deposition, diffusion, and powder metal methods. beryllides intermetallic compounds mechanical properties oxidation resistance thermal properties References Aitken...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110196
EISBN: 978-1-62708-247-1
... laser wavelength used in air can be achieved and ~0.2X the wavelength achieved with an SIL (solid immersion lens). The spatial resolution of electrical effects on the device is limited by carrier diffusion lengths and carrier lifetimes, thermal conduction, device structure as well as spot size. By using...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.cw.t51820169
EISBN: 978-1-62708-339-3
... most pronounced in single-pass welds. This suggests that the use of multipass techniques or thermal treatments that allow for hydrogen diffusion will minimize cracking susceptibility. The use of low-hydrogen practice with dissimilar metal welds is also suggested. Selection of an appropriate preheat...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420239
EISBN: 978-1-62708-310-2
... to a high temperature to promote thermal interdiffusion to form solid solutions and intermetallic compounds. For the purpose of phase diagram determination, a diffusion multiple is nothing more than a sample with multiple diffusion couples and diffusion triples in it. An example is schematically...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280149
EISBN: 978-1-62708-267-9
... withstand the severe thermal cycle imposed by fusion welding. Many applications demand that specimens taken from a qualification-welded assembly be capable of passing 2 t 180° side-bend testing (where t is the material thickness). This test requires 20% elongation of the outer fibers of the bend specimen...
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
... led to reductions in chromium content and to greater oxidation attack and susceptibility to hot corrosion. To protect against local oxidation and hot corrosion, two different types of coatings have been developed: aluminide diffusion coatings and overlay coatings. In recent years, thermal barrier...