High temperature fracture mechanisms on non-oriented electrical steels
Keywords:Hot ductility, Fracture mechanisms, AlN precipitation
In this research work the effect of deformation temperature on the hot ductility of non-oriented electrical steels (0.6 % Si-0.3 Al %) was studied using high temperature tensile tests. The specimens were machined from two thin slabs (50 mm thickness) produced by CSP process (Compact Strip Process), one of them using 100 % sponge iron and the other using 67 % scrap and 33 % sponge iron. The tensile tests were carried out at constant strain rate (5×1010–4 s–1), and a temperature range from 850 to 1,200 °C. The results showed that the ductility decreased with the increment in the temperature until approximately 1,000 °C. At higher temperatures, a ductility recovery was observed only in the steel fabricated without scrap. Scanning Electron Microscopy on fracture surfaces showed that the loss of ductility is associated with intergranular cracking promoted by the austenitic transformation and AlN grain boundaries precipitation.
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