Study and modelling of the influence of second phase particles on the austenite grain growth in a niobium microalloyed steel
DOI:
https://doi.org/10.3989/revmetalm.2006.v42.i2.13Keywords:
Austenite Grain grain growth, Nb microalloyed steel, Grain coarsening temperature, Modeling, Continuous heatingAbstract
The austenite grain growth occurred during continuous heating in a niobium microalloyed steel has been investigated in this work. The effect of temperature and heating rate on the grain size is studied. The free grain coarsening temperature is determined as a function of the heating rate. It is found that unpinning by precipitates occurs around 40-70K below the temperature of complete dissolution of carbonitrides. Furthermore, a new model has been proposed to describe the austenite grain coarsening under the influence of niobium carbonitrides during continuous heating at different rates.
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