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...

The hydrogen embrittlement (HE) leads to severe steel degradation of mechanical properties. atoms diffuse into the and get positioned reversible irreversible trap sites. pipe transport oil gas needs be welded construct long-distance pipeline projects; thus, friction-stir welding (FSW) has proven an excellent alternative joining these pipelines. Therefore, this work assessed analyzed influence o...

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...

Abstract Isothermal bainitic transformation of a lean medium-Mn steel containing (in mass%) 0.18C–3.6Mn–1.7Al–0.23Si–0.2Mo–0.04–Nb after full austenitization at 1100 ºC was studied by means high resolution dilatometry. The effects isothermal holding temperatures ranging from 450 to 350 °C on the kinetics experimentally characterizing microstructure present time 15 min 2 h. obtained results show...

The addition of high-content alloying elements and the unbefitting process make carbide-free bainite steel difficult in industrial production. Thus, we adopted a dynamic continuous cooling for developing high-strength cold-rolled low-alloy bainitic steels this study. influence rates on microstructure mechanical properties was investigated by dilatometry, scanning electron microscopy (SEM), X-ra...

The mechanism of the bainite transformation in carbon containing steels was discussed after presenting our recent experimental results; (1) the bainite transformation has its own C-curve, (2) incomplete phenomenon is a general feature of the bainite transformation, (3) bainitic fenite grows to a limited size, and (4) bainitic ferrite is highly supersaturated with respect to carbon. It was exami...

Isothermal transformation characteristics of a medium carbon Ti-V microalloyed steel were investigated using light microscopy, scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS), and by uniaxial compressive testing. Samples austenitized on 1100 °C isothermally treated in the range from 350 to 600 subsequently water quenched. The final microstructure samples he...