Abstract
Abstract Heat treatment of steel is used to adjust different microstructures and mechanical properties. The Quenching and Partitioning (Q&P) process or cyclic annealing for grain refinement lead to increased strength and ductility. Both approaches demand a strict temperature control and a close strip temperature tracking. A control strategy for optimal properties is developed. Herefore a one-stand laboratory scale hot rolling process line was equipped with a water cooling section. A detailed temperature control during the cooling process was established accounting for strip thickness and velocity, set point temperatures, and amount of water cooling. While industrial set points and parameters of closed-loop controllers are often empirical, the presented control system and strategies are investigated by MatLab-Simulink. The improved material properties were evaluated in annealing tests. The control system for the cooling track reduces the temperature gradient within the strip to 12 K. The simulation of the cooling track gives an optimal set point. As a prerequisite for a controlled design of time-temperature-cycles, it can be calculated for various process parameters. Grain sizes <5 μm are achieved by cyclic annealing and accompanied by increased strength and ductility. The Q&P treatment produces tempered martensite and retained austenite with improved mechanical properties.
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.
