Tempering of hard mixture of bainitic ferrite and austenite
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چکیده
منابع مشابه
Tempering of hard mixture of bainitic ferrite and austenite
Recent work has shown that bainitic ferrite plates produced by transformation at low temperatures can be as thin as 20 nm with a hardness in excess of 650 HV30, tensile strengthy2.3 GPa and toughnessy30 MPa m. Because these properties rely on the fine scale of the microstructure, a study has been carried out in relation to the tempering resistance of steel over the temperature range 350 – 750uC...
متن کاملSynchrotron X–ray Studies of Austenite and Bainitic Ferrite
High resolution synchrotron X–ray diffraction has been used to conduct in situ studies of the temporal evolution of phases during the isothermal growth of bainite. Two populations of austenitic material were identified: one corresponding to the initial austenite, the other to the carbon–enriched austenite associated with the bainitic ferrite. The observed lattice parameters and the asymmetry of...
متن کاملAustenite films in bainitic microstructures
Bainitic microstructures in which fine platelets offerrite are intimately mixed with films of austenite are known to exhibit good combinations of strength and toughness. It isfound that the thickness of these austenitefilms can be estimated by assuming that the carbon diffusion field around an existing plate offerrite prevents the close approach of another parallel plate. This is because the re...
متن کاملExperimental Evidence for Non-Cubic Bainitic Ferrite
The first evidence is provided for the existence of a tetragonal or slightly orthorhombic unit cell of bainitic ferrite. It supports the hypothesis that the excess carbon that persists in the ferrite, which is in contact with austenite, is a consequence of an increased solubility due to the change in symmetry from the conventional cubic unit cell. The deviations from the cubic cell are maintain...
متن کاملMorphology Feature of Nanostructure Bainitic Steel after Tempering Treatment
The microstructure characterization of tempered nanocrystalline bainitic steel is investigated in the present study. It is found that two types of plastic relaxation, dislocation debris and nanotwin, occurs in the displacive transformation due to relatively low transformation temperature and high carbon content. Because most carbon atoms trap in the dislocation, high dislocation density can be ...
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ژورنال
عنوان ژورنال: Materials Science and Technology
سال: 2004
ISSN: 0267-0836,1743-2847
DOI: 10.1179/026708304225017355