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Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005229
EISBN: 978-1-62708-187-0
... Abstract Homogenization, in a broad sense, refers to the processes designed to achieve uniform distribution of solutes or phases in a given matrix. This article addresses the root cause for inhomogeneities in cast components. It is nearly a standard industrial practice to homogenize alloys...
Abstract
Homogenization, in a broad sense, refers to the processes designed to achieve uniform distribution of solutes or phases in a given matrix. This article addresses the root cause for inhomogeneities in cast components. It is nearly a standard industrial practice to homogenize alloys before thermomechanical processing. The article lists the objectives of homogenization and benefits of homogenization treatments. The benefits include increased resistance to pitting corrosion, increased resistance to stress-corrosion cracking, improved ductility, and uniform precipitate distribution during subsequent aging. The article provides a schematic illustration of an energy-dispersive X-ray spectroscope (EDS) scattered data of solute distributions across a dendrite due to microsegregation of chromium and molybdenum. It concludes with information on the computational modeling for simulation of microsegregation of chromium and molybdenum.
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Influence of alternating gas flow direction on cooling curve homogeneity fo...
Available to PurchasePublished: 01 February 2024
Fig. 16 Influence of alternating gas flow direction on cooling curve homogeneity for helium quenching of gears with 10 bar. (a) Batch structure. (b) Thermocouple positions. Cooling curves (c) without and (d) with alternating gas flow direction every 10 s
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Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006257
EISBN: 978-1-62708-169-6
... Abstract Homogenization heat treatment can be useful for improving the performance and life of an alloy while in service or for improving the processability during fabrication and hot working. This article describes the identification of incipient melt point, slowest-diffusing elements...
Abstract
Homogenization heat treatment can be useful for improving the performance and life of an alloy while in service or for improving the processability during fabrication and hot working. This article describes the identification of incipient melt point, slowest-diffusing elements, and microstructural scale for homogenization of metal alloys. It also discusses the CALPHAD software to optimize the homogenization heat treatment and the Scheil module of the commercial thermodynamic modeling software.
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Miscibility gap. Region 1: homogenous α is stable. Region 2: homogenous α i...
Available to PurchasePublished: 01 December 2004
Fig. 4 Miscibility gap. Region 1: homogenous α is stable. Region 2: homogenous α is metastable, only incoherent phases can nucleate. Region 3: homogeneous α metastable, coherent phases can nucleate. Region 4: homogeneous α unstable, spinodal decomposition occurs. Source: Ref 4
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Miscibility gap. Region 1: Homogenous α is stable. Region 2: Homogenous α i...
Available to PurchasePublished: 27 April 2016
Fig. 16 Miscibility gap. Region 1: Homogenous α is stable. Region 2: Homogenous α is metastable; only incoherent phases can nucleate. Region 3: Homogeneous α is metastable; coherent phases can nucleate. Region 4: Homogeneous α is unstable; spinodal decomposition occurs. Source: Ref 10
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FMR in amorphous FeB showing the difference between (a) a homogeneous sampl...
Available to PurchasePublished: 01 January 1986
Fig. 21 FMR in amorphous FeB showing the difference between (a) a homogeneous sample and (b) an inhomogeneous sample. Secondary ion mass spectroscopy suggested that both samples were identical.
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Types of scattering curves. (a) Widely separated homogeneous spheres. (b) P...
Available to PurchasePublished: 01 January 1986
Fig. 4 Types of scattering curves. (a) Widely separated homogeneous spheres. (b) Phase separated blend, block copolymer, a metallic alloy, or a glass. (c) A random structure. (d) A liquid or glass with no structure.
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Homogeneous dislocation tangle in δ-ferrite deformed to fracture in tension...
Available to PurchasePublished: 01 January 1986
Fig. 65 Homogeneous dislocation tangle in δ-ferrite deformed to fracture in tension at 4 K. Thin foil TEM specimen
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in Directionally Solidified and Single-Crystal Superalloys
> Properties and Selection: Irons, Steels, and High-Performance Alloys
Published: 01 January 1990
Fig. 15 CMSX-2 element homogenization effect. Source: Ref 21
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in Directionally Solidified and Single-Crystal Superalloys
> Properties and Selection: Irons, Steels, and High-Performance Alloys
Published: 01 January 1990
Fig. 18 Homogeneous deformation in CMSX-2 ( T 2 heat treatment) after 0.16% creep strain at 760 °C (1400 °F). Source: Ref 29
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As-VARed structure following homogenization. Courtesy of Special Metals Cor...
Available to PurchasePublished: 01 January 2005
Fig. 6 As-VARed structure following homogenization. Courtesy of Special Metals Corporation
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(a) Flow stress and (b) strain to failure as a function of homogenization t...
Available to PurchasePublished: 01 January 2005
Fig. 7 (a) Flow stress and (b) strain to failure as a function of homogenization time at 523 °C (975 °F). Deformation temperature is 493 °C (920 °F).
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Modified metal flow patterns for extrusion. S, homogeneous deformation with...
Available to PurchasePublished: 01 January 2005
Fig. 6 Modified metal flow patterns for extrusion. S, homogeneous deformation with very low friction on billet/container interface; A, homogeneous deformation with low friction on billet/container interface; B, homogeneous deformation with moderate friction on billet/container interface; C
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Micrograph of cast and homogenized 6061 aluminum alloy, showing the precipi...
Available to PurchasePublished: 01 December 2004
Fig. 4 Micrograph of cast and homogenized 6061 aluminum alloy, showing the precipitate-free zone (PFZ) (lack of Mg 2 Si precipitates) at grain boundary. The PFZ was created by the lack of silicon, which is wrapped up in the AlFeSi precipitates at the grain boundary. Source: Ref 4
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Examples of isomorphous elements with homogenous solid solution over the ra...
Available to Purchase
in Physical Metallurgy Concepts in Interpretation of Microstructures
> Metallography and Microstructures
Published: 01 December 2004
Fig. 5 Examples of isomorphous elements with homogenous solid solution over the range of compositions. (a) Solidification region of copper-nickel phase diagram. (b) Hafnium-zirconium phase diagram with an isomorphism during solidification (L → β) and a solid-state isomorphism (β → α). Source
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Published: 27 April 2016
Fig. 14 Free-energy curves for homogeneous nucleation. Source: Ref 2
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Process steps of Homogenous Metals, Inc. to produce powdered metal billets....
Available to PurchasePublished: 30 September 2015
Fig. 5 Process steps of Homogenous Metals, Inc. to produce powdered metal billets. Used with permission from MIT
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Ball milling (left) and attritor milling (right) are used to homogenize the...
Available to PurchasePublished: 30 September 2015
Fig. 3 Ball milling (left) and attritor milling (right) are used to homogenize the powder mixture and reduce particle size.
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Schematic illustrations of homogeneous (a and b) and heterogeneous (c and d...
Available to PurchasePublished: 31 October 2011
Fig. 6 Schematic illustrations of homogeneous (a and b) and heterogeneous (c and d) nucleation. Figures on the left are for a temperature above the melting point. Figures on the right are for a temperature below the melting point. The wetting angle, θ, is shown in (d).
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Comparison of free-energy changes associated with homogeneous nucleation, h...
Available to PurchasePublished: 31 October 2011
Fig. 8 Comparison of free-energy changes associated with homogeneous nucleation, heterogeneous nucleation, and fusion welding
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