Influence of Ultra-Fast Cooling Technology on Microstructure and Mechanical Properties of Ti-Microalloyed Steel

Abstract:

In recent years, the ultra-fast cooling process is a new technology used to control the strip cooling process in the international which corresponds to an average cooling rate higher than 150°C/s. This new technology can provide an effective means to the development of low-cost and high-performance steels. In this paper, the phase transformation temperatures, microstructures and mechanical properties of a Ti microalloyed steel were investigated by means of a themomechanical simulator and a D450mm mill equipped with ultra-fast cooling device. The results show that the phase transition temperatures decreased and micro-hardness increased with the increasing of cooling rate. The microstructures of steel used ultra-fast cooling process was small and more uniform than the ones used laminar flow cooling and air cooling process, and finer and uniformity dispersed precipitates can be produced under ultra-fast cooling process, hence higher yield strength and good elongation was obtained for the steel. The ultra-fast cooling technology has a good effect on the microstructures and properties of the Ti microalloyed steel.

• Periodical: Advanced Materials Research (Volume 337)
• Pages: 414-417
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.337.414
• Online since: September 2011
• Authors: Hai Long Yi, Yang Xu, Zhen Yu Liu, Guo Dong Wang, Di Wu
• Keywords: Phase Transformation Temperature, Precipitate, Ti Microalloyed Steel, Ultra-Fast Cooling

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