The bainite start temperature Bs is defined as the highest temperature at which ferrite can transform by a displacive transformation. A common observation is that the bainite start temperature is very sensitive to the chemical composition, indicating that the influence of solutes is more than just thermodynamic. Empirical linear regression models have long been used to calculate the Bs in a lim...

The influence of aluminium on the microstructure of austempered ductile cast iron (ADI) has been studied. A number of irons of different compositions have been made by green sand casting and gravity die casting of appropriate design to provide the experimental materials. Austenitising was carried out at different temperatures and holding times for a variety of experimental irons to achieve suff...

An increase in technical requirements related to the prediction of mechanical properties steel engineering components requires a deep understanding relations which exist between microstructure, chemical composition and properties. This paper is dedicated research relation hardness with temperature isothermal decomposition austenite. When setting equations for predicting microstructure constitue...

Abstract Thermomechanical processing consisted of hot-rolling in the austenitic region with deformation both above and below non-recrystallization temperature. Immediately after rolling, specimens were directly quenched water to three different temperatures 560 °C, 420 °C room The first two samples, which 560° C 420°C, immediately cooled slowly furnace. microstructure samples mostly comprised u...

The development of nano/ultrafine bainitic structure in AISI 52100 steel was the goal of this study. For this purpose,the AISI 52100 the specimens were austenitized at 1050 °C for 60 min followed by low-temperature austemperingtreatment at different temperatures and times. The austempered samples were characterized using field emissionscanning electron microscopy (FESEM), X-ra...

In the present paper, medium-C Si-rich steel with a quenched martensite microstructure was heated to intercritical annealing temperatures at 750 °C, 760 °C and 770 after warm rolling deformation obtain ferrite varying volume fractions. Subsequently, bainite/ferrite multiphase microstructures were attained via austempering near Ms temperature. The of test different heat treatments characterized ...