Abstract
The dispersion behavior of nano-sized TiC particles treated by different processes and its influence on microstructural and mechanical modification has been investigated in SA-106B carbon steel with different TiC contents. It was found that mechanically-activated TiC nanoparticles introduced into a carbon steel matrix were dissolved during hot rolling and re-precipitated vigorously during subsequent normalizing treatment at 920°C. The dispersed TiC particles were very fine (<20nm), giving a suppressing effect on the growth of recrystallized austenite to promote considerable grain refinement of final ferrite–pearlite structure. This fine microstructure (grain size: ~10μm) with a homogeneous distribution of TiC particles offers a higher strength level (yield strength: 372MPa, tensile strength: 544MPa) without sacrificing ductility (>30%) and impact energy (>250J) at the TiC content of 0.1wt%. Theoretical calculations showed that grain refinement plays a dominant role in enhancing the yield strength of TiC-bearing carbon steel, together with nanoparticle strengthening interacting on the solid solution strengthening and dislocation strengthening.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
