Oxidation Kinetics and Spallation Model of Oxide Scale during Cooling Process of Low Carbon Microalloyed Steel

• Main Authors: Cao Guangming, Li Zhifeng, Tang Junjian, Sun Xianzhen, Liu Zhenyu
• Format: Article
• Language: English
• Published: De Gruyter 2017-09-01
• Series: High Temperature Materials and Processes
• Subjects: low carbon microalloyed steel; oxidation kinetics; spallation behavior; cooling rate; mathematical model
• Online Access: https://doi.org/10.1515/htmp-2015-0248
• ISSN: 0334-6455; 2191-0324

The spallation behavior of oxide scale on the surface of low carbon microalloyed steel (510L) is investigated during the laminar cooling of hot rolling strip. Surface, cross-section morphology and phase composition of oxide scale in different laminar cooling rate are observed by scanning electron microscopy (SEM) and X-Ray Diffraction (XRD). Moreover, a spallation mathematic model is established based on empirical formula to predict the critical thickness of oxide scale and the test of high temperature oxidation kinetics at different temperatures between 500 °C to 900 °C provides oxidation rate constant for the model calculation. The results of heat-treatment test and model calculation reveal that laminar cooling rate plays an important role in controlling the thickness of oxide scale and suppressing spallation behavior.