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dynamic gas quenching

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By Volker Heuer
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005770
EISBN: 978-1-62708-165-8
... chambers; and the three gases used, namely, nitrogen, helium, and argon. It also discusses two different groups of fixture materials used, namely, high-nickel-content alloys and carbon-fiber-reinforced carbon materials. The article exemplifies the process of dynamic gas quenching and how core hardness...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005788
EISBN: 978-1-62708-165-8
.... This provides a thicker film on the workpiece surface, thus extending the vapor-blanket stage of cooling, resulting in delayed quenching. Other important variables that must be properly controlled are bath temperature and agitation rate. Heat-transfer dynamics can also be controlled in gas-quenching...
Image
Published: 01 December 2009
Fig. 26 Heat-transfer coefficients determined using computational fluid dynamics for a large ring gear that was gas quenched More
Series: ASM Handbook
Volume: 4F
Publisher: ASM International
Published: 01 February 2024
DOI: 10.31399/asm.hb.v4F.a0007008
EISBN: 978-1-62708-450-5
... temperature and then quenching them by fast cooling. Water, aqueous polymer, oil, molten salt, or gas is generally used as a quenching medium, and the specific choice depends on the alloy chemical composition and the desired mechanical properties for the product. Commercial alloys have been formulated...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005436
EISBN: 978-1-62708-196-2
... h fG Heat-transfer coefficient at metal-film interface h LG Heat-transfer coefficient at liquid-gas interface h Ni Heat-transfer coefficient, nickel h s Heat-transfer coefficient at metal-quench interface k Thermal conductivity k g Thermal conductivity gas...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005800
EISBN: 978-1-62708-165-8
... the parameters associated with resistance spot welding, laser welding, and metal active gas welding. It also provides useful information of retained austenite volume fraction measured by x-ray diffraction and electron backscatter diffraction. The article also examines microstructure evolution during tensile...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005813
EISBN: 978-1-62708-165-8
...-pressure carburizing and high-pressure gas quenching process Oxygen-free hydrocarbons such as acetylene C 2 H 2 (ethyne) are used as a carbon source. The hydrocarbons are injected into the furnace chamber, creating a pressure of a few millibars. On the surface of the treated parts, the hydrocarbons...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005794
EISBN: 978-1-62708-165-8
... Abstract The fluidized bed provides a means for exchanging heat between a metal part, the solid particles, and the fluidizing gas and which is viable for quenching. This article briefly considers the design aspects of the gas distributor, plenum, container, immersed cooling tubes and surface...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003266
EISBN: 978-1-62708-176-4
... element is expensive and oxidizes easily. The furnace can only be opened at relatively lower temperatures to avoid oxidation. Quenching has to be performed with an inert gas, such as helium. Environmental chambers are less expensive ( Fig. 23 ). An environmental chamber has a circulation system...
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005950
EISBN: 978-1-62708-166-5
... jet quenching and intensive quenching processes. One-directional weak coupling is usually considered enough for gas, jet, or intensive quenching processes. It is promising for the future of immersion quenching simulations. (t) It is necessary for accurate simulation of coupled computational fluid...
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001732
EISBN: 978-1-62708-178-8
... properties of another chemical species. For example, Br − , I − , and dissolved O 2 gas in solution can be determined from their collisional quenching effects. Fluorescence-enhancement effects can be used similarly. In indirect kinetic and enzymatic fluorimetric methods, the nonfluorescent analyte...
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005923
EISBN: 978-1-62708-166-5
... is integrated with heating, and handling facilities are arranged accordingly. Machined gears are charged into a continuous pusher-type gas carburizer. Workpieces are loaded on alloy trays with fixtures that permit direct quenching. The principal elements of such a system are: Quenchant storage-supply...
Series: ASM Handbook
Volume: 1
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v01.a0005547
EISBN: 978-1-62708-161-0
... carbon equivalent CG compacted graphite em centimeter CP cathodic protection CQ commercial quality Abbreviations, Symbols, and Tradenames I 1039 fcc face-centered cubic lee Jominy equivalent cooling MPa megapascal FG flake graphite Jeh Jominy equivalent hardness mph miles per hour FGD flue gas...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.9781627081658
EISBN: 978-1-62708-165-8
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005530
EISBN: 978-1-62708-197-9
... is extracted from the part, whether from quenching in a liquid bath, by liquid sprays, or from forced air/gas cooling. In the case of quenching in a liquid bath, the type of liquid and agitation has an effect on the cooling rate and hence the HTCs ( Ref 3 ). The same quench oil may exhibit different...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005410
EISBN: 978-1-62708-196-2
... a nucleating system as a homogeneous phase using the classical nucleation theory, along with heterophase fluctuations that led to the formation of precipitates. It discusses the gas cluster dynamics using the kinetic approach to describe nucleation. The article presents key parameters, such as cluster...
Book Chapter

Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005816
EISBN: 978-1-62708-165-8
... by the impingement of a quenchant medium on a hot metal surface. Some of these processes have obvious differences, while others are similar and differ only in degree. Examples include the addition of droplets of water (or other volatile liquids) to a gas quenching stream in fog quenching ( Ref 1 ); quenching...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002400
EISBN: 978-1-62708-193-1
... microstructures dominates bending fatigue crack initiation and unstable crack propagation of direct-quenched carburized steels. The intergranular cracking may be associated with other microstructural features, such as the surface oxides generated by gas carburizing, but it generally extends much deeper...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003166
EISBN: 978-1-62708-199-3
...-current electrical contacts, and electrodes for arc lamps and tungsten inert gas welding (also called gas tungsten arc welding, or GTAW). While pure tungsten can be used for all these cited applications, optimum performance is generally realized in doped, alloyed, or composited forms. Lamp filaments...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006352
EISBN: 978-1-62708-179-5
... and Hunt theory Q&T quenched and tempered k thermal conductivity, strength coef cient, partition r radius coef cient R universal gas constant, radius, electrical resistance, kD permeability coef cient stress ration K slope Rm strength at rupture Kf fatigue notch factor Rp0.2 stress at yield point (0.2...