Influence of the microstructure on the fracture toughness of forging microalloyed steels
Keywords:Microalloyed steels, Thermomechanical treatments, Mechanical properties, Toughness, Microstructure, Acicular ferrite
The influence of thermomechanical treatments, first carried out at laboratory and afterwards on an industrial scale on the mechanical properties of microalloyed forging steels is analysed. The influence of hot working conditions and the cooling rate after hot working on both the strength and the toughness is analysed. Optimization of the thermomechanical treatments parameters has been carried out at laboratory and the optimized schedules have been carried out industrially. The actual experimental results of mechanical properties have been rationalized in terms of the microstructure developed during the different thermomechanical treatments. After slow cooling of steel bars hot rolled at low temperature (below 850 °C), the ferrite-pearlite is much refined and the toughness improved. Alternatively, accelerated cooling after hot working at high temperature produces a microstructure of acicular ferrite with improved toughness.
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How to Cite
Romero, J. L., Linaza, M. A., San Martín, J. I., Rodríguez-Ibabe, J. M., & Urcola, J. J. (1996). Influence of the microstructure on the fracture toughness of forging microalloyed steels. Revista De Metalurgia, 32(3), 167–179. https://doi.org/10.3989/revmetalm.1996.v32.i3.912
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