Effect of Fast Annealing on Microstructure and Mechanical Properties of Non-Oriented Al-Si Low C Electrical Steels |
| Journal |
Materials Science Forum (Volume 560) |
| Volume |
Advanced Structural Materials III |
| Edited by |
H. Balmori-Ramirez, J.G. Cabañas-Moreno, H.A. Calderon-Benavides, K. Ishizaki and A. Salinas-Rodriguez |
| Pages |
29-34 |
| DOI |
10.4028/www.scientific.net/MSF.560.29 |
| Online since |
November, 2007 |
| Authors |
Emmanuel Gutiérrez C.,
Armando Salinas-Rodríguez,
Enrique Nava-Vázquez
|
| Keywords |
Electrical Steels, Grain Growth, Mechanical Property, Recrystallization, Silicon Steels |
| Abstract |
The effects of heating rate and annealing temperature on the microstructure and
mechanical properties of cold rolled Al-Si, low C non-oriented electrical steels are investigated
using SEM metallography and uniaxial tensile tests. The experimental results show that short term
annealing at temperatures up to 850 °C result in microstructures consisting of recrystallized ferrite
grains with sizes similar to those observed in industrial semi-processed strips subjected to long term
batch annealing treatments. Within the temperature range investigated, the grain size increases and
the 0.2% offset yield strength decreases with increasing temperature. It was observed that the rate of
change of grain size with increasing temperature increases when annealing is performed at
temperatures greater than Ac1 (~870 °C). This effect is attributed to Fe3C dissolution and rapid C
segregation to austenite for annealing temperatures within the ferrite+austenite phase field. This
leads to faster ferrite growth and formation of pearlite when the steel is finally cooled to room
temperature. The presence of pearlite at room temperature decreases the ductility of samples
annealed at T > Ac1. |
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