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enthalpy of melting

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Image
Published: 01 November 1995
Fig. 10 Enthalpy of fusion of network-forming oxides as a function of melting point. Source: Ref 5 More
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005523
EISBN: 978-1-62708-197-9
... of transformation; enthalpy of melting; solidus and liquidus temperatures; coefficient of thermal expansion; density; surface tension; viscosity; electrical and thermal conductivity; and emissivity. casting electrical conductivity solidification thermophysical properties viscosity ADVANCED COMPUTER...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005274
EISBN: 978-1-62708-187-0
... on the walls of the vessel are distributed uniformly in the melt. 2) Drain away the excess liquid to form a compact, self-supporting slug for subsequent forming operations. Fig. 5 Schematic of Alcan's Swirled Enthalpy Equilibration Device (SEED) process. HPDC, high-pressure die casting. Source: Ref 4...
Image
Published: 27 April 2016
Fig. 4 Variation of enthalpy, H , and free energy, G , with temperature for the solid and liquid phases of a pure metal. L , latent heat of melting; T m , equilibrium melting temperature. Adapted from Ref 1 More
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005189
EISBN: 978-1-62708-187-0
... Abstract This article introduces the fundamental concepts of chemical thermodynamics and chemical kinetics in describing presolidification phenomena. For metallurgical systems, the most important thermodynamic variables are enthalpy and Gibbs free energy. A qualitative demonstration...
Image
Published: 09 June 2014
Fig. 8 Free reaction enthalpy for carbon and silicon oxidation dependent on temperature for various carbon and silicon activities in iron melts. Source: Ref 10 More
Image
Published: 31 August 2017
Fig. 7 Free reaction enthalpy for carbon and silicon oxidation dependent on temperature for various carbon and silicon activities in iron melts. Source: Ref 5 More
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005272
EISBN: 978-1-62708-187-0
... melt casting temperature through solidification and a typical casting ejection temperature releases ∼900 J/g (390 Btu/lb) to the die, whereas semisolid casting at 0.5 fraction solid (where enthalpy is only 300 J/g, or 130 Btu/lb) releases ∼500 J/g (215 Btu/lb) through casting ejection, which results...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005514
EISBN: 978-1-62708-197-9
... , Ref 9 , Ref 10 ). Also see the articles “Thermophysical Properties of Solids,” “Thermophysical Properties of Liquids,” and “Thermophysical Properties for Solidification Models” in this Volume. Measurement Methods Specific Heat, Enthalpy, and Transition Temperatures The specific heat...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005234
EISBN: 978-1-62708-187-0
... driving force for the solid-liquid phase change in casting processes is the extraction of heat from the liquid melt. To describe the thermal response to this heat removal, the conservation equation for energy transport can be written in terms of either the enthalpy of the solid-liquid mixture...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005907
EISBN: 978-1-62708-167-2
... ). Because the magnetic Reynolds number is very small (Re m ≪ 1), the influence of the melt motion on the magnetic field may not be taken into account. Temperature Field The distribution of the temperature field is computed from the equation for enthalpy ( h ) with Joule heat, which is taken...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005718
EISBN: 978-1-62708-171-9
..., resulting in less time for particle heating. Lower particle temperatures may lead to lower deposit densities, since a larger percentage of unmelted or partially melted particles become included in the deposit. Increasing jet enthalpy can compensate for shorter dwell times. Lower particle temperatures may...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006672
EISBN: 978-1-62708-213-6
...: Determination of Temperature and Enthalpy of Melting and Crystallization” ISO 11357-4 “Plastics—Differential Scanning Calorimetry (DSC) Part 4: Determination of Specific Heat Capacity” ISO 11357-5 “Plastics—Differential Scanning Calorimetry (DSC) Part 5: Determination of Characteristic Reaction-Curve...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005240
EISBN: 978-1-62708-187-0
.... coefficient of thermal expansion density electrical conductivity emissivity enthalpy of fusion liquidus temperature casting simulation solidus temperature specific heat capacity surface tension thermal conductivity thermophysical properties viscosity enthalpy of melting ADVANCED COMPUTER...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005525
EISBN: 978-1-62708-197-9
... equations. heat transfer properties mass transfer coefficient metals and alloys numerical methods solidification IN THE PROCESSING OF MOST METAL PRODUCTS, a critical step is the solidification of an alloy from a melt to make an ingot or a part with a particular shape. Frequently...
Series: ASM Handbook
Volume: 3
Publisher: ASM International
Published: 27 April 2016
DOI: 10.31399/asm.hb.v03.a0006223
EISBN: 978-1-62708-163-4
... the lowest free energy and is therefore the equilibrium state of the system. At T m , both phases have the same value of G and both the solid and liquid can coexist in equilibrium. Therefore, T m is the equilibrium melting temperature at the pressure concerned. Fig. 4 Variation of enthalpy, H...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005237
EISBN: 978-1-62708-187-0
..., and H S and H L are the intensive enthalpies of the solid and liquid (J kg −1 ), respectively. The enthalpies are expressed in terms of the respective enthalpies at a reference temperature, T H , where the latent heat is: (Eq 16) L = H L H + H S H The time derivative...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005903
EISBN: 978-1-62708-167-2
... potential of these elements dissolved in the melt is calculated in three different concentrations and is recorded in addition to the lines for the pure substances over temperature ( Ref 10 ). The CO pressure here is assumed to be 1 bar, which is discussed subsequently. Fig. 8 Free reaction enthalpy...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005589
EISBN: 978-1-62708-174-0
... ( Ref 6 , 8 ): (Eq 4) η a η m P = V fm E fm + V bm E bm where η a and η m are the arc and melting efficiencies, respectively; P is the arc power; and E fm and E bm are the melting enthalpies of the filler metal and base metal, respectively. The left...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005348
EISBN: 978-1-62708-187-0
... (denotes rate of change); h hour ASTM American Society for Testing and depth; diameter h height D diameter; distance; diffusivity; density H enthalpy; height; magnetic eld strength Materials D diffusion coef cient in liquid HAZ heat-affected zone at.% atomic percent Di diffusion coef cient across...