| Issue |
MATEC Web Conf.
Volume 370, 2022
2022 RAPDASA-RobMech-PRASA-CoSAAMI Conference - Digital Technology in Product Development - The 23rd Annual International RAPDASA Conference joined by RobMech, PRASA and CoSAAMI
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| Article Number | 03003 | |
| Number of page(s) | 9 | |
| Section | Material Development | |
| DOI | https://doi.org/10.1051/matecconf/202237003003 | |
| Published online | 01 December 2022 | |
Effect of Al addition on the solidification structure of 441 dual stabilised ferritic stainless steel
1 Department of Materials Science and Metallurgical Engineering,University of Pretoria, South Africa
2 Sasol Synfuels, Metallurgical Engineering Services, Regional Operations and Assert Services, PdP Kruger street, Secunda, 2302, RSA
* Corresponding author: u20747226@tuks.co.za
Ferritic stainless steels (FSS) develop poor surface finish during processing and this is attributed to the large columnar grains formed during solidification. Addition of alloying elements such as Al, Ti and Nb used in dual stabilized FSS improve the solidification structures. In this work, two 441 dual stabilized FSS, with 0.023 and 0.068 %Al respectively were investigated in the as-cast condition. The columnar to equiaxed zone ratio was determined by the linear interception method. The results showed that the higher the Ti/Al ratio, the higher the equiaxed ratio. The inclusions reported from SEM showed that there were more spinel inclusions of Ti-Al-O as well as more TiN precipitates in the steel with 0.023 wt% Al.
© The Authors, published by EDP Sciences, 2022
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