The influence of isothermal treatment prior to the initial quenching step Q&P process was investigated in 0.26C – 4.15Mn 1.39Si steel. Compared microstructure processed steel: a mixture martensite and retained austenite, subjected before (BQ&P) consists bainitic ferrite, austenite. Formation ferrite during refined austenite grain size made filmy morphology prevalent final microstructure. Beside...

Ultra high strength steels are of enormous interest especially in the automotive industry due to their potential in realising light weight structures and improving the crash behaviour. However the poor formability of these steels limits their application for many parts in the car body. A solution to this limitation can be a local heat treatment using a laser beam to soften the material where a ...

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...

In the production of critical parts for various machines and mechanisms, expensive structural steels are used alloyed with chromium, nickel, molybdenum, vanadium. practice, wear resistance parts, especially under severe operating conditions, may be insufficient due to uneven microstructure content retained austenite. Therefore, increasing operational stability products made alloy is an importan...

The effect of cold swaging and subsequent annealing on the structure mechanical properties a 321-type metastable austenitic stainless steel was studied. Cold to strain 90% produced gradient with gradual decrease in α-phase content from edge center bar. Globular lamellar regions both strain-induced martensite retained austenite were found center, meanwhile, completely globular austenite–martensi...

The crystallographic orientation dependence of the transformation induced plasticity (TRIP) in high carbon bainitic steel was studied. 0.6% C-2.0% Si-1% Cr steels were austenitized at two conditions to obtain different size prior-austenite grains. Subsequently, they austempered evolve structure composed mainly ferrite and retained austenite. characteristic this sample is that it has much larger...

The decomposition of austenite to ferrite or cementite begins at the equilibrium phase boundary of austenite/ (ferrite austenite) or austenite/(cementite austenite) in binary Fe–C phase diagram. The temperature values on the phase boundaries of austenite/(ferrite austenite) and austenite/(cementite austenite) at a certain carbon content are called Ae3 and Acm temperatures of the steel, respecti...