Terms of service of the steels with retained austenite in the microstructure, is severely depended on the stability of austenite during the course of deformation. The present work aims to evaluate the mechanical stability of austenite in nanostructured, carbide free bainitic steels during tensile testing and cold rolling process. To achieve the microstructure with retained austenite, the steel ...

Abstract This paper examined the cyclic deformation behaviour of multiphase low-carbon steel that was subjected to austempering heat treatments at four temperatures (190 °C, 230 275 and 315 °C) below martensite start temperature ( M s = 353 °C). The tests were conducted room temperature, under fully reversed strain-controlled conditions, with strain amplitudes in range 0.5–1.0%. microstructure ...

Abstract The microstructure evolution and impact toughness of the coarse grain heat-affected zone (CGHAZ) TiNbV microalloyed steels were investigated by using a thermal simulation test. samples treated with various simulated welding cycles. phase constituents sizes analyzed electron backscatter diffraction analysis. CGHAZ consisted ferrite, acicular pearlite, bainite. have higher under lower he...

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...

1 In-situ Observations of Lattice Parameter Fluctuations in Austenite and Transformation to Bainite S. S. Babu Formerly at Metals and Ceramics Division, Oak Ridge National Laboratory Oak Ridge, TN 37831 USA, Currently at Edison Welding Institute, Columbus, Ohio 43017, USA E. D. Specht and S. A. David Metals and Ceramics Division, Oak Ridge National Laboratory Oak Ridge, TN 37831 USA E. Karapetr...

Displacive transformations involve the disciplined motion of atoms. As a result, there are clearly defined relationships between all aspects of the parent and product lattices. The theory for this is well established but has not been exploited in the calculation of transformation textures. This paper is a critical assessment of the methods for the estimation of crystallographic textures during ...