Pearlitic steel experiences excessive corrosion in a hot and humid atmosphere. The multiphase bainitic/martensitic structure was developed for better combination of strength ductility, especially rolling contact fatigue, but little attention to has been investigated. Corrosion behaviors steels obtained from bainitic-austempering (BAT) bainitic-quenching -partitioning (BQ&P) processes were i...

The effect of multi-step austempering treatments on the microstructure and mechanical properties a novel medium carbon high silicon carbide-free bainitic steel was studied. Five different isothermal treatment processes were selected, including single-step above martensite start temperature (at 350 °C 370 °C, respectively), three kinds two-step routes (370 + 300 250 °C). In comparison with adopt...

Deformation-induced martensitic transformation (DIMT) during tensile or compressive deformations of the bainitic steels with various carbon content (0.15 %C, 0.25 0.62 %C) was studied. The initial microstructure before deformation tests prepared by austempering at 400 °C to obtain structure consisting ferrite and retained austenite. volume fraction austenite larger in steel content. In all stee...

Austempered ductile iron (ADI) has been proved to be an excellent material as it possesses attractive properties: high strength, ductility and toughness combined with good wear resistance and machinability. These properties can be achieved upon adequate heat treatment which yields the optimum microstructure for a given chemical composition. The heat treating of the ductile cast iron produces th...

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 Impingement jet heat transfer was studied using liquid and gas fluids to determine better cooling fluid. The materials used were rectangular steel plates of 230 mm by 120 12 mm, single diameters 10–40 with impingement gaps 115–155 mm. A computational fluid dynamics software application ANSYS 2020R1 employed for simulation, lumped thermal mass analysis experimental modeling. results sho...