Akademik Veri Yönetim Sistemi
Transactions of the Indian Institute of Metals, cilt.79, sa.3, 2026 (SCI-Expanded, Scopus)
Advanced high-strength steels (AHSS), especially TRIP (transformation-induced plasticity) steels, are developed to meet the automotive industry's increasing demand for lightweight, fuel-efficient, and crash-resistant materials. This study provides a comprehensive investigation into the production of hot-rolled TRIP steel, starting with the thermomechanical control processing (TMCP) and extending through to isothermal treatment. A hot-rolled TRIP steel (Fe–0.17C–1.53Si–1.47Mn–0.06Nb wt%) was produced by two cooling schedules that involved intercritical annealing and isothermal treatment. Intercritical annealing is considered a crucial step in the production of TRIP steels. The volume fraction of austenite and the multiphase microstructure are influenced by the intercritical annealing temperature. As a result, intercritical annealing was carried out at two different temperatures, 790 °C and 830 °C, followed by an isothermal treatment at 450 °C for 30 min. The transformation from the coarse and inhomogeneous ferrite–pearlite microstructure to a multiphase microstructure, consisting of ferrite, bainite, and retained austenite, after hot rolling was investigated using LM, SEM, EBSD, and XRD. With the increase in intercritical annealing temperature, the volume fraction of ferrite decreases. Hardness and tensile tests were performed after hot rolling and heat treatments. After intercritical annealing at 830 °C and isothermal treatment at 450 °C, the tensile strength reached approximately 800 MPa, elongation was 25%, and PSE was 20 GPa%, indicating an optimized balance of strength and ductility.