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...

In this study, the austenite transformation behaviour in a medium-Mn (MMn) steel is investigated during heat treatments that replicate those occurring low-temperature hot stamping (LTHS), with aim of better understanding to optimise heat-treatment design. The austenitisation and critical phase temperatures LTHS heating process their dependence on conditions are using dilatometry Gleeble 3800 th...

Abstract This paper compares the microstructure and mechanical evolution in a high-strength quenched micro-alloyed steel during austenitising bending process. Simulation results indicated new finding that stress neutral layer (SNL) tends to move tension zone straining. The hardness gradient detected from centre compression/tension zones was resulted comprehensive factors: First of all, location...

Martensitic stainless steel powder exhibits a high nitrogen uptake when densified by supersolidus liquid-phase sintering in atmosphere, but the optimum uptake, which is beneficial to its resistance corrosion, unknown. In this study, of high-carbon martensitic X190CrVMo20-4-1 atmosphere against pitting corrosion was explored. This clarify impact matrix quenched and tempered condition on an aqueo...

The microstructure and properties of a 5 wt.% Cr cold work tool steel were studied after austenitisation at 1020°C, 1050°C or 1075°C followed by single, double and triple tempering treatments at 525°C. The microstructures were investigated with scanning electron microscopy and X-ray diffraction and phase transformations were studied by dilatometry. Furthermore, hardness and Charpy un-notched an...

This work deals with the feasibility of obtaining Austempered Ductile Iron with Dual Phase structures (DPADI) through heat treatment, starting from different as-cast microstructures. The mechanical properties on these microstructures were evaluated. DPADI microstructures were obtained by adding different tenors of silicon (2.4% to 4.2%) to the melts and keeping the other alloying elements const...

This paper reports the capability of a range electromagnetic non-destructive evaluation (NDE) methods to characterise decarburising phenomena in Hadfield steels. Four steel samples were austenitised at 1050 °C for 1, 2, 3 and, 4 hours an air furnace followed by water quenching produce various depths. The decarburisation depth was characterised using hardness profile measurements, optical and sc...