منابع مشابه
Carbon in Cubic and Tetragonal Ferrite
It is generally assumed that the phase diagrams and equilibrium thermodynamic data that apply to the conventional Fe-C system, also are relevant to the case where supersaturated ferrite is in contact with austenite. It seems that this may not be correct, since a change in the symmetry of the ferrite unit cell in the presence of excess carbon has the potential to alter the nature of the phase eq...
متن کاملTetragonal domain structure and magnetoresistance of
La12xSr xCoO3 ~LSCO! has recently been found to exhibit large magnetoresistance ~MR! effect. In this paper, microstructures of LSCO thin films, which may provide important clues for understanding the unusual MR characteristics in these intrinsic magnetic oxides, were determined by transmission electron microscopy. An ordered, anisotropic perovskite-type structure n-LSCO was observed and its ato...
متن کاملSolubility of carbon in tetragonal ferrite in equilibrium with austenite
There are precise observations which indicate the reluctance of excess carbon within bainite or martensite to partition into adjacent austenite in spite of prolonged heat treatment at temperatures where carbon is mobile. To explain this, we report the first calculations of the solubility of carbon in tetragonal ferrite that is in equilibrium with austenite. It is found that the solubility is dr...
متن کاملA Reinvestigation of a Superhard Tetragonal sp3 Carbon Allotrope
I 4 ¯ -carbon was first proposed by Zhang et al., this paper will report regarding this phase of carbon. The present paper reports the structural and elastic properties of the three-dimensional carbon allotrope I 4 ¯ -carbon using first-principles density functional theory. The related enthalpy, elastic constants, and phonon spectra confirm that the newly-predicted I 4 ¯ -carbon is thermodynami...
متن کاملDeveloping Very Fine Nanopearlitic Structure in a High Carbon Steel Wire before Drawing
The effects of steel wire patenting process parameters on very fine interlamellar spacing in the pearlitic steel wire were investigated and the optimized condition of the process was achieved. In this work, the initial nanopearlitic structure was obtained in a 0.72 wt% carbon steel wire before the wire drawing process. The results were the minimum interlamellar spacing of 35 nm and maximum ulti...
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ژورنال
عنوان ژورنال: Nature
سال: 1927
ISSN: 0028-0836,1476-4687
DOI: 10.1038/119494a0