Effect of microstructure and texture on the impact transition behaviour of thermo-mechanically treated reinforcement steel bars

Effect of Thermal Exposure on the Charpy Impact Properties of Thermo-Mechanically Treated Reinforcement Steel Bar

“…The macro‐texture of rolled “flat” products (plates or strips) is usually represented by Ø 2 = 45° ODF section based on the texture study on RD‐TD plane at ¼ thicknesses location . Though the deformation phenomenon (i.e., symmetry during rolling) for flat product and round steel bar is certainly different, the representation of crystallographic texture of TMT rebars based on Ø 2 = 45 °C ODF section in a recent study showed that the major texture components that are typically observed in flat‐rolled products are also present in the rebars . Further study, however, needs to be carried out to understand the difference in texture formation between flat‐rolled products and round rebars during thermo‐mechanical treatment.…”

“…With the increase in urban population and extremity in weather condition, natural disasters like earthquake, cyclonic storm, blizzard, and man‐made disasters like explosions are increasingly becoming concern to the structural safety for avoiding human causalities and financial crisis. Considering these aspects, in order to ensure the structural integrity over a long duration, besides corrosion resistance and fatigue resistance, impact toughness is emerging as another essential requirement for TMT rebars . In a recent study, present authors justified the necessity of ensuring satisfactory impact toughness in TMT rebars, in order to prevent catastrophic brittle fracture during the above mentioned natural disasters …”

“…This could be due to the difficulty associated with the preparation of impact test specimen, representative of the impact properties of the rebar owing to its round cross‐section and composite microstructure. Recent study, from the present authors, addressed this issue and proposed the use of a new specimen design, based on semi‐circular cross‐section and machined V‐notch, for the impact testing of TMT rebars . The newly designed impact test specimen was termed as modified direct V‐notched specimen, i.e., modified DVN specimen …”

“…Recent study, from the present authors, addressed this issue and proposed the use of a new specimen design, based on semi‐circular cross‐section and machined V‐notch, for the impact testing of TMT rebars . The newly designed impact test specimen was termed as modified direct V‐notched specimen, i.e., modified DVN specimen …”

“…Detailed fractography study has been performed on the broken Charpy impact tested specimens using SEM. Detailed discussion on the specimen design and stress distribution within the impact test specimen for TMT rebar is reported in a recent study …”