Results 171 to 180 of about 10,505 (224)
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Nature, 1965
SEVERAL methods for the preparation of the carbides of iron have been reported in the literature. In order to obtain a satisfactory product it may be necessary to use a relatively high temperature1, or long periods of reaction during which reaction conditions must be controlled within narrow limits for several weeks2,3.
J. FREEL, A. K. GALWEY
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SEVERAL methods for the preparation of the carbides of iron have been reported in the literature. In order to obtain a satisfactory product it may be necessary to use a relatively high temperature1, or long periods of reaction during which reaction conditions must be controlled within narrow limits for several weeks2,3.
J. FREEL, A. K. GALWEY
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Precipitation of Ferrite from Cementite
Metal Science, 1975AbstractWhen unalloyed or dilute-alloyed white cast iron is held at subcritical temperatures, in particular at 400–500°C, fine ferrite particles are found to precipitate as platelets from the eutectic cementite. The ferrite particles precipitate preferentially on the lattice imperfections in the cementite. As a result of the precipitation, the eutectic
T. Okamoto, H. Matsumoto
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Three-Body Abrasive Behavior of Cementite–Iron Composite with Different Cementite Volume Fractions
Tribology Letters, 2016Cementite–iron composites with 0, 7.83, 18.56, 49.21, 81.75 and 100 vol% cementite were prepared by melting and plasma spark sintering. The effect of cementite content on microstructure, mechanical properties and wear resistance of the cementite–iron composites was investigated.
Baochao Zheng +6 more
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Transformation of cementite into austenite
Metal Science and Heat Treatment, 19821. Austenitization of white iron primary cementite crystals in contact with ferrite commences at the interphase boundary. Austenite is formed as a result of withdrawal of carbon atoms from cementite into ferrite. 2. Grains of austenite phase forming in cementite create lamellar clusters oriented along the direction of cementite crystal ...
V. M. Ershov, L. S. Nekrasova
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Cementite morphology in pearlite
Acta Metallurgica, 1956Abstract Some characteristic growth patterns of cementite in pearlite, revealed by electron microscopy, are discussed in terms of the geometry of growth and of diffusion and surface energy factors. These include 1. (a) linear discontinuities in the lamellar structure, which are shown to be one possible origin of branching, 2.
F.C Frank, K.E Puttick
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Comments on ‘Thermodynamics of cementite layer formation’
Scripta Materialia, 2010Recently Nafe offered a thermodynamic explanation for the previously reported suppression of metal dusting by the presence of ammonia in the gaseous carburising atmosphere leading to formation of massive Fe3C (cementite) layers on the surface of ferritic iron (α-iron).
Leineweber, A. +3 more
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Ferrite: Cementite crystallography in pearlite
Metallurgical Transactions A, 1992The interlamellar crystallography of pearlite in iron-carbon alloys is examined in Fe-0.8C and Fe-0.81C-12Mn steels with attention given to the Bagaryatsky, Pitsch-Petch, and Isaichev orientation relationships and their related atomic habit planes.
D. S. Zhou, G. J. Shiflet
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Temperature investigations of mechanosynthesized cementite
The Physics of Metals and Metallography, 2014Methods of differential thermal analysis and Mossbauer spectroscopy (57Fe) have been used to study the process of the formation of cementite in α-Fe upon the low-temperature mechanosynthesis (T < 375 K) in the medium of liquid hydrocarbons. It has been established that this process occurs in the absence of austenite and corresponds to a two-stage model
V. A. Barinov +2 more
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Free Energy of Formation of Cementite and the Solubility of Cementite in Austenite
JOM, 1951The solubility of cementite in austenite is computed by thermodynamic methods from the observed solubility of graphite. It is found that the solubility of cementite is greater than that of graphite in the entire austenite temperature range. Thus the prior discrepancy between this portion of the phase diagram and the observed metastability of cementite ...
L. S. Darken, R. W. Gurry
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Materials Science and Technology, 1993
Abstract It is proposed that cementite owes its stability, relative to other iron carbides, to its crystal structure, which enables its carbon atoms to form extra covalent bonds with iron atom neighbours. An analysis based on tight binding theory suggests that cementite has an advantage of nearly 0·5 eV per Fe3C unit over an alternative Fe3C carbide ...
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Abstract It is proposed that cementite owes its stability, relative to other iron carbides, to its crystal structure, which enables its carbon atoms to form extra covalent bonds with iron atom neighbours. An analysis based on tight binding theory suggests that cementite has an advantage of nearly 0·5 eV per Fe3C unit over an alternative Fe3C carbide ...
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