An alloy design concept leading to an improved ridging resistance in the transformable ferritic stainless steels is introduced. It is based on achieving a small c-phase fraction at the ingot soaking temperature. The c-phase fraction is then increased to a maximum value during the early stages of hot rolling. The nucleation of c-phase islands in the ferritic matrix increases the fraction of transformed ferrite. The multiplicity of crystallographic orientations resulting from the afic and cfia transformations leads to a pronounced weakening of the as-cast texture and an increased ridging resistance.
Abstract:In ferritic stainless steel~FSS!, undesirable surface defects of ridging appear during deep drawing. The formation of these defects is attributed to the inhomogeneous distribution of orientations of individual grains. In the present work, a new electron backscattered diffraction R~a!-value map was introduced, and the dependence of the tensile directions on the formation of ridging in an FSS sheet was discussed using this map. The results showed that large grain colonies in the R~a!-value maps lead to the formation of severe ridging in an FSS sheet.
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