Novel oxide particles composed of Ti, rare-earth metal and Zr was found by the present authors to promote formation acicular ferrite (AF), but their effect on toughness has not yet been clarified. Therefore, influence AF low carbon steel investigated using Ti-Rare earth metal-Zr-killed (TRZ) Al-killed (AL) steels in this study. Dominant microstructure AL is bainite forming block/packet structur...

Abstract A combination of physical simulation and laboratory rolling experiments, including thermomechanical low-temperature ausforming, was conducted for designing a suitable processing route to enable phase transformation from austenite ultrafine bainite in medium-carbon steel. Following ausforming at 500-550 °C, two different cooling holding paths were tried the study: (1) water close marten...

In conventional steels, bainitic microstructure which forms under isothermal conditions consists of ferrite and carbide precipitates whose distribution size substantially depend on the pa-rameters treatment. CFB steels (Carbide Free Bainite) however, main micro-structural constituents are ferrite, retained austenite and, sometimes, M-A constituent. may possess better ductility same or even high...

We examine here the physical aspects and input parameters of a recently published model on the overall transformation kinetics of the bainite reaction in steels.

Experimental results and explanations for the transition temperature from upper to lower bainites in carbon steels containing from 0.20 to 1.80 wt%C were presented metallographically and kinematically. The experimental results are summarized as follows: I) Lower bainite is not formed in steels with less than 0.35 wt%C and no transition from upper to lower bainite occurs. 2) The transition tempe...

Abstract This research paper mainly studied the microstructure and hardness of weld bead welding heat affected zone ultrafine grain steel after CO 2 gas-shielded welding. After normalizing quenching treatment, changes in welded joints were studied. These experimental results showed that joint was dendritic. The a mixed structure proeutectoid ferrite, side plate bainite, pearlite. overheated HAZ...

Using fiber laser welding technology, X80 pipeline steel welded joints with different heat inputs were obtained. Their microstructure, mechanical properties, and corrosion resistance (in NACEA solution saturated hydrogen sulfide) studied. Findings indicated that the increase in input, proportion of ferrite, strength, elongation, increased within a certain range sum martensite bainite hardness d...

The effect of the negative clearances between punch and die a flange with different fine blanking half-cutting depths was investigated for two low carbon steels various elongation rates, C18E (0.18%C) 20MnB5 (0.2%C, upper mechanical properties than steel), industrially used forming car seat parts. A specific tool adaptable on tensile machine built to determine force needed blank simple geometry...