IngentaConnect Understanding the effect of aluminium on microstructure in low le...

Authors: Palizdar, Y.¹; Scott, A.J.¹; Cochrane, R.C.¹; Brydson, R.¹

Source: Materials Science and Technology, Volume 25, Number 10, October 2009 , pp. 1243-1248(6)

Abstract:

The influence of aluminium on steel microstructure has been examined in low nitrogen steels. There is a lack of knowledge in the literature about the effect of aluminium on steel microstructure at levels greater than 0·1 wt-%. This has not been important as aluminium additions are typically low, with the aluminium being added as a deoxidant and grain refining element. However, recently aluminium has been added at significantly higher levels (0·5-2 wt-%) in new types of transformation induced plasticity (TRIP) steels to delay the bainitic transformation and give a dual phase microstructure. Furthermore, recent studies have shown that aluminium can be considered as a solid solution strengthener in low nitrogen steels. To investigate the effect of aluminium on steel microstructure, steels of differing aluminium composition between 0·02 and 0·98 wt-% have been prepared and investigated by metallography and EBSD. The results show that aluminium has a significant effect on ferrite grain size and ferrite grain size distribution.

Keywords: LOW CARBON STEEL; ALUMINIUM; FERRITE GRAIN SIZE; FERRITE GRAIN SIZE DISTRIBUTION

Document Type: Research article

DOI: 10.1179/174328409X401133

Affiliations: 1: Institute for Materials Research, University of Leeds, Leeds LS2 9JT, UK

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Understanding the effect of aluminium on microstructure in low level nitrogen steels