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...

Incomplete bainitic transformation during austempering treatment is mainly caused by the supersatu-ration of austenite with carbon. Such supersaturated becomes more stable and further stabi-lization led silicon alloying. Stable does not transform remains in structure as so-called residual austenite. Therefore, carbides, which are desirable a conventional struc-ture, cannot be formed carbide fre...

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...

The deformation behavior of nearly fully pearlitic, bainitic and martensitic steels during severe plastic is summarized in this paper. Despite their significantly different yield stresses microstructures, hardening SPD similar. Due to the enormous capacity limited by strength tool materials. microstructure at obtainable limit strain are quite similar, which a nanocrystalline structure order 10 ...

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...