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Grain boundary segregation of Sb in heat affected zones during welding thermal cycles is examined using field emission gun scanning transmission electron microscopy (FEGSTEM) for an Sb-doped Cr–Mo low alloy steel. A Gleeble-1500 thermomechanical simulator is used to simulate the welding heat affected zone with a peak temperature of 1320°C for heat inputs of 36, 60 and 100kJ/cm. The results show that...
A niobium-microalloyed steel is aged at 640 °C after being solution-treated at 1200 °C. Nb(C,N) nanoparticle precipitation is markedly facilitated by a pre-deformation of 15% prior to ageing, leading to a considerable increase in the strength of the steel with no large decrease in ductility. The yield strength of the pre-deformed steel may reach about 710 MPa with an elongation of about 20% after...
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