ABSTRACT
This work examined thermo-mechanical and metallurgical parameters (temperature and cooling rate) that give rise to substantial improvement in the basic functional strength characteristics of high-yield reinforcing steels produced in a conventional mill. A new process tagged Temperature Tracking-Jet Water Spray (TT-JEWAS) was developed to achieve requisite in-process control of thermal variations on one hand and fast undercooling by spray quenching on the other. The alternative microstructure obtained, lower bainite instead of pearlite induced in the steel, gave rise to a significant improvement in the strength characteristics (Yield strength, 422-843MPa; Ultimate tensile strength, 704-1173MPa, Impact energy, 85-111J) and reliability of the steel. These compared favourably with both local and international standards (NIS 117:2004, BS 4449:1988 and ASTM A615: 1996). This result implies that substantial import substitution can be achieved in the high-yield reinforcing steel bar industry to give tremendous boost to the nation‟s Gross Domestic Products (GDP). Bainitic Yield strength-band and Empirical model developed from the results of this work are extremely useful for in-process quality control and prediction of yield strength of hot rolled steel bars. This will lead to improvement in processing methods in the local steel industry.
Olatunde, S (2021). Thermomechanical Processing And Constitutive Strength Of Hot Rolled Mild Steel. Afribary. Retrieved from https://afribary.com/works/thermomechanical-processing-and-constitutive-strength-of-hot-rolled-mild-steel
Olatunde, SEKUNOWO "Thermomechanical Processing And Constitutive Strength Of Hot Rolled Mild Steel" Afribary. Afribary, 03 May. 2021, https://afribary.com/works/thermomechanical-processing-and-constitutive-strength-of-hot-rolled-mild-steel. Accessed 30 Apr. 2024.
Olatunde, SEKUNOWO . "Thermomechanical Processing And Constitutive Strength Of Hot Rolled Mild Steel". Afribary, Afribary, 03 May. 2021. Web. 30 Apr. 2024. < https://afribary.com/works/thermomechanical-processing-and-constitutive-strength-of-hot-rolled-mild-steel >.
Olatunde, SEKUNOWO . "Thermomechanical Processing And Constitutive Strength Of Hot Rolled Mild Steel" Afribary (2021). Accessed April 30, 2024. https://afribary.com/works/thermomechanical-processing-and-constitutive-strength-of-hot-rolled-mild-steel