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The mechanism of acicular ferrite in weld deposits
Current Opinion in Solid State and Materials Science, 2004Abstract Research has shown that the acicular ferrite microstructure in steel weld metal, which provides an optimum combination of strength and toughness, is indeed intragranularly nucleated bainite. It is possible to maximize the content of acicular ferrite by increasing the intragranular nucleation sites while maintaining a critical weld metal ...
S S Babu
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Effect of plastic deformation on the formation of acicular ferrite
Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, 2003Abstract The effect of plastic deformation on the transformation of austenite to acicular ferrite in a Fe–Mn–Si–C alloy steel containing non-metallic inclusions was investigated. The transformation to acicular ferrite is retarded and the final fraction of acicular ferrite is reduced in plastically deformed austenite, which is a characteristic of a ...
H K D H Bhadeshia
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Metallurgical Transactions A, 1989
An experiment has been designed to confirm that the mechanism of growth of acicular ferrite in steel welds is similar to that of bainite in ordinary steels. On the hypothesis that the growth mechanisms are identical, it was expected that if the carbon concentration of a weld is increased sufficiently, then for similar welding conditions, the ...
A. A. B. Sugden, H. K. D. H. Bhadeshia
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An experiment has been designed to confirm that the mechanism of growth of acicular ferrite in steel welds is similar to that of bainite in ordinary steels. On the hypothesis that the growth mechanisms are identical, it was expected that if the carbon concentration of a weld is increased sufficiently, then for similar welding conditions, the ...
A. A. B. Sugden, H. K. D. H. Bhadeshia
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Thermodynamics of acicular ferrite nucleation
Materials Science and Technology, 1994AbstractThe thermodynamic driving force necessary to stimulate the nucleation of acicular ferrite and bainite is investigated for a series of high strength weld metals, using a combination of dilatometry, scanning electron microscopy, and thermodynamic calculations.
G. I. Rees, H. K. D. H. Bhadeshia
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Stress and the acicular ferrite transformation
Materials Science and Engineering: A, 1992Abstract Acicular ferrite is considered to be identical in transformation mechanism to bainite, except that it nucleates intragranularly on inclusions, and hence develops into a morphologically different microstructure. The transformation causes displacements which, on a macroscopic scale, are characteristic of an invariant-plane strain with a large ...
S.S. Babu, H.K.D.H. Bhadeshia
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Grain Size of Acicular Ferrite in Ferritic Weld Metal
Welding in the World, 2011Morphologically, the acicular ferrite (AF) microstructure developed in ferritic weld metal has been widely described as having an “interlocking structure” or “basket weave structure,” following its fine nature of the optical microstructure revealed by 2 % Nital etching solution.
Ka Hee Kim +3 more
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Preparation of acicular NiZn-ferrite powders
Journal of Materials Science, 1986Acicular NiZn-ferrite powder particles have been prepared from goethite-derived acicular Fe2O3 and spherical constituent oxides in the presence of molten chloride or sulphate. The morphology of NiZn-ferrite particles has been studied with reference to the effect of chemical species of molten salts, ferrite composition and particle size of constituent ...
Yoshihiro Hayashi +2 more
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Structure of acicular ferrite. Part 1
Metal Science and Heat Treatment, 2009Topics of classification, initiation, and morphology of intermediate structures in low-carbon steels are discussed. The morphological parameters of such structures are studied in detail. Aspects of the attainment of high strength and viscoplastic characteristics in steel upon formation of a structure of acicular ferrite are analyzed. The second part of
V. I. Bol’shakov +2 more
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Investigation on the H2S-resistant behaviors of acicular ferrite and ultrafine ferrite
Materials Letters, 2002Hydrogen-induced cracking (HIC) and sulfide stress cracking (SSC) of both acicular ferrite and ultrafine ferrite in H2S environments were evaluated. The results show that the two microstructures have the optimum HIC resistance as well as the good mechanical properties. Moreover, acicular ferrite has the better SSC resistance than ultrafine ferrite. (C)
Zhao, MC +4 more
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