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Chen J.-L.,University of Science and Technology Beijing | Yu W.-H.,University of Science and Technology Beijing | Chen S.-D.,University of Science and Technology Beijing | Xia Q.-Q.,CISDI Research and Development Co.
Journal of Iron and Steel Research | Year: 2016

The isothermal bainite transformation curve of TRIP780 steel was measured by DIL805L quenching dilatometer. The change rate of microstructure during phase transformation was calculated by using expansion volume-time curve, and the relationship between the rates of the change of microstructure under different processes and the corresponding time was studied. The rule of isothermal transformation of TRIP steel was researched. The results show that under the same heating temperature, the higher the isothermal temperature, the higher the transformation speed of bainite, while the total rate of transformation decreases at the same time. When the isothermal temperature is the same, the rate of transformation increases with the increase of the heating temperature. The tip of the nose on transition ending line with C shape at the right of bainite isothermal transformation diagram corresponds to the shortest transformation time. © 2016, Gangtie Yanjiu Xuebao. All rights reserved.

Feng K.,CISDI Research and Development Co. | Feng K.,CISDI Group Co. | Wang S.-G.,CISDI Research and Development Co. | Wang S.-G.,CISDI Group Co. | And 5 more authors.
Journal of Iron and Steel Research International | Year: 2013

According to the two types of slab defects (surface crack and internal crack), a real-time slab quality diagnosis and analysis system named CISDI_SQDS ONLINE R2011 was developed based on heat transfer and solidification simulation, stress and strain calculation as well as metallurgical process analysis about continuous casting, combined with expert knowledge database for specific casting events. The respective crack formation indexes were introduced as the theoretical reference data for slab quality level evaluation. Meanwhile, both the quality loss factors related to casting metallurgical rules and the adjusting factors related to casting events were taken into full consideration, which was integrated organically with theoretical analysis and expert system. The system can be widely used as an important theoretical tool for prediction and control of slab quality in slab continuous casting process. © 2013 Central Iron and Steel Research Institute.

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