Thermo-mechanical treatments using continuous cooling after forging are an established method for producing bainitic steels, mainly because of the elimination energy intensive additional heat treatment processes. The is usually employed in uncontrolled manner industrial sector, which can be detrimental to resulting microstructural morphology and, consequently, final product properties. In this ...

A high-strength low-carbon construction structural steel was investigated in the laboratory. The various austenite grain sizes were obtained by austenitizing at different temperatures. effect of size on bainite transformation studied dilatometer. results show that microstructure steels mainly includes granular bainite, lath-like and martensite-austenite (M-A). changes from to with increase temp...

This study aims to examine the correlation between microstructures and mechanical properties of two high-strength API X70 linepipe steels with different specimen directions Moaddition. The microstructure Mo-added steel has an irregularly shaped AF, GB matrix pearlite because relatively large deformation in non-recrystallization temperature region, while that Mo-free shows a PF bainitic microstr...

In situ three-dimensional (3-D) X-ray diffraction experiments have been performed at a synchrotron source on low-alloyed multiphase TRIP steels containing 0.25 wt.% Si and 0.44 wt.% Al and produced with different bainitic holding times, in order to assess the influence of the bainitic transformation on the thermal stability of individual austenite grains with respect to their martensitic transf...

In this work, local properties such as hardness and fatigue crack grow rate in the heat-affected zone of four laser-welded butt joints thin high-strength low-alloy steel were examined, so to explain predict lives at high stress levels through fracture mechanics approach. The different welded series presented a similar growth fusion zones, but lower than base metal due higher bainitic–martensiti...

In this study, a multi-element microalloyed GCr15Si1MoNbV bainitic bearing steel was designed by adding trace amounts of Nb and V. The bainite/martensite/retained austenite/undissolved carbide multiphase with short heat-treated cycle remarkable comprehensive mechanical properties prepared via low-temperature austempering, which compared traditional quenched tempered martensitic microstructure. ...

This paper describes a new methodology for characterising the plastic zone ahead of fatigue crack. is applied to set experimental data obtained by synchrotron X-ray diffraction on bainitic steel compact tension specimen. The based generating equivalent Von Mises strain field from elastic maps. Based material response, threshold then maps identify size and shape zone. lies between plane stress W...