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direct heat source

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Published: 01 December 2016
in the interdendritic residual liquid; local heat flow is consistent with the growth direction. Source: Ref 60 – 62 . (c) Alloy modified with sodium. Eutectic nucleates at mold wall and grows into cast part center; local heat flow is opposite to the growth direction. Source: Ref 35 , 60 More
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Published: 01 November 2011
Fig. 2.12 Effect of polarity on gas tungsten arc welding weld configuration when using direct current: (a) direct current electrode negative (DCEN), deep penetration, narrow melted area, approximate 30% heat in electrode and 70% heat in base metal; (b) direct current electrode positive (DCEP More
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Published: 01 December 2016
cells from wall to the center. Main heat flow is opposite to the growth direction; local heat flow coincides with growth direction at eutectic cell interface. Modified alloy. Source: Ref 53 More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050057
EISBN: 978-1-62708-311-9
.... By doing this, there is no current cancellation effect and thin pieces can be heated efficiently. Fig. 4.3 Example of transverse flux coil, with arrows showing direction of feed of the strip. Source: Ref 3 Coil Design Factors that influence coil design and selection include...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2000
DOI: 10.31399/asm.tb.aet.t68260055
EISBN: 978-1-62708-336-2
... billet furnace and log shears to age ovens and stacking equipment to control the entire manufacturing process with high productivity is also included in this chapter. Fig. 1 Layout of an aluminum extrusion installation. Source: UBE Industries, Ltd. Types of Extrusion Presses Direct Press...
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Published: 01 August 2015
Fig. 4.36 Control of heating patterns in two different regions of a (a) workpiece by winding the turns in opposite directions. (b) Current travels in both sets of turns in same direction. (c) Upper turns with current traveling in opposite direction to lower turns. Source: Ref 3 More
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Published: 01 March 2006
Fig. 18 Schematic of a typical installation for high-volume batch quenching of carburized or hardened parts on trays. Directional vanes in the oil stream distribute the oil flow uniformly. Unit contains combined heating and cooling elements and provision for blanketing the surface of the oil More
Image
Published: 01 December 2016
Fig. 1.5 Local temperature field at a particular crystallite growth front. (a) Zone of the directional dendrite solidification, heat transfer by solid phase, positive temperature gradient in the liquid alloy. (b) Zone of solidification of the equiaxed grains, heat transfer by liquid phase More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290099
EISBN: 978-1-62708-306-5
... Abstract During fusion welding, the thermal cycles produced by the moving heat source causes physical state changes, metallurgical phase transformations, and transient thermal stresses and metal movement. This chapter begins by discussing weld metal solidification behavior and the solid-state...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2024
DOI: 10.31399/asm.tb.phtpp.t59380017
EISBN: 978-1-62708-456-7
.... The cryogenic process used for transforming retained austenite to martensite takes the temperature down to –100 °C (–150 °F). Equally important to whether gas burners or heating elements are used is the determination of whether the heat source should be direct or indirect. The open-type, direct-fired source...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240303
EISBN: 978-1-62708-251-8
.... This equation is only valid for steady-state heat flow, that is, for situations in which the heat flux q does not change with time. The minus sign in the equation indicates that the direction of heat flow is from hot to cold, or down the temperature gradient. Heat is transported in solid metals...
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Published: 01 August 2015
Fig. 3.2 Induction heat-treat power supply basic diagram. ac: alternating current; dc: direct current. Source: Ref 2 More
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Published: 30 April 2024
Fig. 5.31 Induction heat treat power supply basic diagram. ac, alternating current, dc, direct current. Source: Ref 2 More
Image
Published: 01 November 2013
to the heat flow direction will advance most rapidly. Other orientations tend to be overgrown, due to mutual competition, leading to the formation of a columnar zone . (b) Beyond a certain stage in the development of the columnar dendrites, branches that become detached from the latter can grow independently More
Image
Published: 30 April 2024
Fig. 2.1 Schematic sections through high-fired furnaces. (a) Simplest form of direct-fired heat treating furnace. (b) Principles of one form of indirect firing (muffle-type) furnace. Source: Ref 1 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.ex2.t69980417
EISBN: 978-1-62708-342-3
... of the material being extruded, tooling that is not directly involved, and tooling that fulfills auxiliary and support functions. The first group includes extrusion dies, porthole and bridge dies, as well as mandrels. These extrusion tools come into direct contact with the billet material heated...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420429
EISBN: 978-1-62708-310-2
...; that is, the major axis of each grain is randomly oriented. Columnar Zone Inside of the chill zone, there are a series of columnar, or column-shaped, grains that are oriented almost parallel to the heat flow direction. Because each metal grows more favorably in one principal crystallographic direction, only...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630035
EISBN: 978-1-62708-270-9
... heat treatments, in addition to the desire for increased hardness, which provides enhanced strength and wear properties. For best resistance to fatigue fracture, the surface areas should have compressive residual stresses in directions that are perpendicular to the expected fatigue-crack direction...
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Published: 01 August 2005
propagation direction. Source: Ref 2.18 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240095
EISBN: 978-1-62708-251-8
... because, as the primary arm solidifies and gives off its latent heat of reaction, the temperature immediately adjacent to the primary arm increases. This creates another temperature inversion in the liquid between the primary arms, so secondary arms shoot out in that direction. A similar argument can...