Low temperature bainitic ferrite: Evidence of carbon super-saturation and tetragonality
نویسندگان
چکیده
منابع مشابه
Experimental 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 کاملCritical assessment 20: On carbon excess in bainitic ferrite
For several decades, the question of carbon supersaturation in bainitic ferrite has attracted the attention of physical metallurgists. Originally, this was associated with excess carbon due to the displacive nature ofphase transformation and its subsequent trappingatdefects inbainitic ferrite. The development of advanced experimental techniques, such as atom probe tomography and in situ synchro...
متن کاملتأثیر چگالی نابجایی‌ها بر رفتار تغییر شکل فولاد بینیتی فوق مستحکم
Presence of nanoscale bainitic ferrites and high carbon retained austenites that are stable at ambient temperature within the microstructures of super strong bainitic steels makes it possible to achieve exceptional strengths and ductility properties in these groups of nanostructured steels. This article aims to study the effect of the dislocation density variations during tensile testing in amb...
متن کاملTempering 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...
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ژورنال
عنوان ژورنال: Acta Materialia
سال: 2015
ISSN: 1359-6454
DOI: 10.1016/j.actamat.2015.03.018