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diffusion zone

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420239
EISBN: 978-1-62708-310-2
...) The use of diffusion couples in phase diagram studies is based on the assumption of local equilibria at the phase interfaces in the diffusion zone. The latter implies that an infinitesimally thick layer adjacent to the interface in such a diffusion zone is effectively in thermodynamic equilibrium with its...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350095
EISBN: 978-1-62708-315-7
... for stainless steel). The case structure of a nitrided steel, containing a diffusion zone with or without a compound zone ( Fig. 7 ), depends on the type and concentration of alloying elements and the time-temperature exposure of a particular nitriding treatment ( Ref 13 ). The diffusion zone is the original...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410499
EISBN: 978-1-62708-265-5
... Evaluation , Surf. Eng. , Vol 3 ( No. 2 ), 1987 , p 123 – 137 10.1179/sur.1987.3.2.123 21.80 Somers M.A.J. , Development of Compound Layer and Diffusion Zone during Nitriding and Nitrocarburizing of Iron and Steels , Thermal Engineering of Steel Alloy Systems , Krauss G. , Ed...
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
... mm (0.004 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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440141
EISBN: 978-1-62708-262-4
..., a surface zone—exhibiting good wear/friction-resistant properties. In addition, fatigue characteristics can be considerably improved, particularly when nitrogen is retained in solid solution in the “diffusion zone” beneath the compound layer. This retention normally is achieved by quenching in oil or water...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.caaa.t67870075
EISBN: 978-1-62708-299-0
... displacement from an alkaline zincate solution, then the zinc is diffused into the aluminum to produce a zone of zinc-enriched alloy that is anodic to the underlying aluminum. It was found that 3003 aluminum with a correctly balanced zinc diffusion treatment exhibited uniform corrosion and that the depth...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170003
EISBN: 978-1-62708-297-6
... of not austenitizing and quenching, nitriding produces minimum distortion and results in excellent dimension control. The case of nitrided steel contains a diffusion zone with or without a zone of iron-nitrogen compounds, such as FeN and Fe 2–3 N. Other surface-modification processes for ferrous products include...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310203
EISBN: 978-1-62708-326-3
... white layer or compound layer with an underlying diffusion zone of dissolved nitrogen in iron. The white layer improves surface resistance to wear. In addition, fatigue characteristics can be considerably improved, particularly when nitrogen is retained in solid solution in the “diffusion zone” beneath...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220273
EISBN: 978-1-62708-259-4
... microstructures resulting from full annealing are presented. Many annealing treatments do not involve heating above or inside the intercritical zone. The main annealing treatments are spheroidizing, stress-relieving, annealing for hydrogen diffusion, and annealing for recovery and recrystallization...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290137
EISBN: 978-1-62708-306-5
... such plastically deformed areas shows that no diffusion occurs because of extremely rapid self-quenching of the metals. Fig. 6.23 Bond zone pattern typical of explosion clad metals. Materials are type 304L stainless steel and medium-carbon steel. 20×. Source: Ref 6.1 Explosion welding is suitable...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420339
EISBN: 978-1-62708-310-2
... Growth of precipitates occurs by either movement of the incoherent interfaces or a ledge mechanism where coherency is maintained while thickening due to diffusion. Reversion occurs when an alloy containing GP zones or intermediate semicoherent phase is heated above their respective solvus temperatures...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.ttg2.t61120065
EISBN: 978-1-62708-269-3
... (1600 °F) ductile 3003 Al Foil Considered ductile 15Cu-15Ni-Ti 20Cu-20Ni-Ti Powder, foil Brittle when used only as a braze, useful diffusion bonding mechanism 48Zr-48Ti-4Be Powder, ring Brittle but strong 48Zr-48Ti-4Be with 2% Ni Powder Brittle but strong 76.5Al-16.5Cu-4.0Sn-3.0Si...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130177
EISBN: 978-1-62708-284-6
... diffusion of carbon and nitrogen (from ammonia) into the steel surface. To obtain maximum strength, the carbonitriding process produces a surface that is enriched in nitrogen and carbon in the form of an epsilon (ε)-carbonitride layer and a diffusion zone containing chromium-iron carbide, (Cr,Fe) 7 C 3...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420087
EISBN: 978-1-62708-310-2
... and tin atoms to diffuse short distances through the liquid to form the lamellar-type structure. It should be pointed out that although eutectics frequently form a lamellar-type structure on freezing, this not always the case. Fig. 5.8 Lamellar eutectic growth. Source: Ref 5.2 The lead-tin...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870401
EISBN: 978-1-62708-314-0
... delamination curve for carbon/bismaleimide Fig. 15.11 Environmental exposure of carbon/epoxy in Malaysia. Source: Ref 5 Fig. 15.12 Moisture absorption for thermosets and thermoplastics. C/BMI, carbon/bismaleimide; C/E, carbon/epoxy Fig. 15.13 Example of non-Fickian diffusion...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230401
EISBN: 978-1-62708-298-3
..., joint design, and testing. beryllium alloys beryllium bonding brazing soldering welding BERYLLIUM has been successfully joined by fusion welding, brazing, solid-state bonding (diffusion bonding and deformation bonding), and soldering. These different processes are described...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.ex2.t69980141
EISBN: 978-1-62708-342-3
.... This repolygonization is linked to the movement of dislocations but does not require any atom diffusion. In addition, the material recrystallizes usually in the deformation zone (e.g., copper) or immediately on leaving the die (e.g., AlMgSi0.5) so that the newly formed grains grow away from the contact faces...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420429
EISBN: 978-1-62708-310-2
... to be responsible for the much higher rates of diffusion in liquid metals. The higher diffusion rates leads to a picture of liquid metals in which the structure is continuously changing. Atoms form clusters with a high degree of short-range order that may exist for a moment and then fall apart to appear again...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240135
EISBN: 978-1-62708-251-8
... then diffuse to the clusters from the surrounding matrix and convert some of them to nuclei of a new phase. During the early phases of precipitation, the equilibrium phase does not immediately form, but an intermediate crystal structure related to it grows in close contact with the solid solution. As long...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.sap.t53000017
EISBN: 978-1-62708-313-3
... percent in atomic size ( Ref 2 ). The use of high-melting-point elements as the solutes provides stronger lattice cohesion and reduces diffusion, particularly at high temperatures. Similar considerations apply to the hardening of the γ′ phase. Solid-solution hardening also has the effect of decreasing...