Effect of Al addition on the solidification structure of 441 dual stabilised ferritic stainless steel
MATEC Web of Conferences(2022)
摘要
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.
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关键词
solidification structure,stainless steel,al addition
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