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surface diffusion

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Published: 01 December 2008
Fig. 6.14 The comparison of the surface diffusion, the grain-boundary diffusion, and the lattice diffusion. (a) Short-circuit diffusion. (b) Mechanism of surface diffusion More
Image
Published: 01 September 2008
Fig. 37 Tool steel surface after nitriding. (a) White and diffusion layers (b) Coarse nitrides precipitated on grain boundaries. See text for discussion. Courtesy of Villares Metals More
Image
Published: 01 December 2003
Fig. 4 Comparison of various diffusion surface hardening techniques. Source: Ref 1 More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2022
DOI: 10.31399/asm.tb.dsktmse.t56050001
EISBN: 978-1-62708-432-1
.... It discusses the mechanisms behind interstitial, substitutional, grain boundary, and surface diffusion, the derivation and use of Fick’s laws, and the basic principles of diffusion coating processes, including carburizing, nitriding, nitrocarburizing, cyaniding, carbonitriding, boriding, aluminizing...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030082
EISBN: 978-1-62708-282-2
... the critical potential. Some features experimentally observed for dealloying systems are then considered. The chapter concludes by briefly reviewing the proposed mechanisms for the formation of porous metals, namely ionization-redeposition mechanism, surface diffusion mechanism, volume diffusion mechanism...
Image
Published: 30 April 2020
Fig. 10.36 Data for surface area loss and sintering shrinkage during constant rate heating (5 °C/min, or 9 °F/min). If sintering were only by surface diffusion, then there would be no shrinkage while surface area is eliminated. On the other hand, grain-boundary diffusion leads to surface area More
Image
Published: 01 January 2015
Fig. 21.13 Microstructure adjacent to surface of an EX 24 steel carburized and diffused at 1050 °C (1920 °F), cooled to 845 °C (1550 °F), and oil quenched. Original magnification at 1000×. Source: Ref 21.28 More
Image
Published: 01 November 2007
Fig. 7.3 Decarburization removes carbon from a 1095 steel bar by diffusion. A surface reaction between the steel and the oxygen to form CO 2 depletes the surface of carbon atoms. Carbon atoms migrate from the interior of the bar to the carbon-depleted surface More
Image
Published: 01 June 1983
Figure 4.17 Reduced temperature of rear surface of specimen in flash diffusivity method. More
Image
Published: 30 April 2020
Fig. 10.6 Comparison of measured tensile strength (square symbols) and surface-diffusion-predicted strength evolution (model) for 60 min sintering in hydrogen at various temperatures. Experimental data are scattered due to factors such as delta ferrite content and grain size effects. More
Image
Published: 30 April 2020
), the compacts are delicate because the binder has evaporated, but surface diffusion has not induced significant particle bonding. More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.smnm.t52140189
EISBN: 978-1-62708-264-8
... Abstract The design requirements for mechanical shafts, pinions, and gears often call for features with very hard surfaces (to resist wear) based on a softer core (to avoid brittle fracture). This chapter explains how to selectively harden steel by diffusing carbon and nitrogen atoms...
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
... radioactive tracer atoms are introduced onto the surface of nonradioactive gold, the radioactive atoms diffuse into the bulk gold. Eventually, the radioactive atoms become uniformly distributed throughout the entire sample. Although self-diffusion continually occurs in all metals, the effect on the material...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900031
EISBN: 978-1-62708-350-8
... hard and brittle and comprises two intermixed phases. The layer does not diffuse into the steel, but remains on the immediate surface and grows thicker with time, temperature, and gas composition ( Fig. 1 ). Fig. 1 Typical nitrided case The carbon in the steel changes the morphology...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.tm.t52320167
EISBN: 978-1-62708-357-7
... diffusion laws solid phase diffusion If red ink (B) is dropped quietly onto the surface of water (A) and a specific B molecule is tracked, it will move around right and left, up and down, in a quite disorderedly way. However, the movement of the group of B molecules is not disorderly at all; the area...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2022
DOI: 10.31399/asm.tb.dsktmse.9781627084321
EISBN: 978-1-62708-432-1
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900013
EISBN: 978-1-62708-350-8
... the tempering temperature, then the core hardness of the pretreated steel will diminish according to time and temperature. It is most important to maintain the core hardness of the pretreated steel to provide adequate support to the diffused case. Without good core support, the case can fail. Surface...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410551
EISBN: 978-1-62708-265-5
... in.) in depth, in a variety of steels. Nitrogen is adsorbed on the surface of the steel, diffuses inward at temperatures of approximately 500 °C (930 °F), and hardening is accomplished by precipitation of very fine nitride particles in the diffusion zone. Depending on nitrogen concentration, surface layers...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 1998
DOI: 10.31399/asm.tb.ts5.t65900305
EISBN: 978-1-62708-358-4
.... Thermochemical treatments, such as nitriding and carburizing, cause significant changes in surface chemistry by the diffusion of atoms such as nitrogen or carbon into a steel substrate. Thermal treatments cause no change in surface chemistry, but do cause localized surface heating and thereby make possible...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.smnm.t52140063
EISBN: 978-1-62708-264-8
... diagram shows that it is capable of dissolving approximately 1.3% C. However, because the bar is pure iron, it contains little to no carbon, while the charcoal at its surface contains close to 100% C. Hence, the carbon atoms are expected to move into the pure iron bar by the mechanism of diffusion...