Influence of the Cold Rolling and Annealing Sequence on the Ridging Behaviour of Ti‐Stabilized 18% Cr Ferritic Stainless Steel

Abstract

The influence of the cold rolling and annealing sequence on the ridging resistance and the crystallographic texture distribution of AISI 439 type ferritic stainless steel was studied in order to determine optimal processing conditions for surface quality improvement. In the present study, the effect of two sequences of cold rolling and annealing were analysed: a single cold rolling and annealing, and an interrupted cold rolling with an intermediate and a final anneal. In the conventional single step cold rolling, the ridging resistance was found to deteriorate with increasing cold reduction ratio. For a fixed total cold reduction ratio in the two stage cold rolling, ridging was less pronounced when a higher reduction was applied in the second step. Band‐like clusters of grains with similar crystallographic orientations were observed in the mid‐thickness of sheets with severe ridging. The results show that severe ridging is related to the presence of band‐like clusters of 〈111〉//ND oriented grains. The two stage cold rolling was found to result in less band‐like clusters and an improved surface quality.

Effect of Texture Components on the Lankford Parameters in Ferritic Stainless Steel Sheets

“…[18][19][20] Recently, Jung, Mola, Chae and De Cooman interpreted ridging and formability of FSS sheets by calculating R-values from the textures. 21,22) However, a detailed quantification of the texture by texture components and a study of their effects on anisotropy and formability of FSS sheets is still lacking.…”

Microstructure, Texture, and Deep Drawability Under Two Different Cold-Rolling Processes in Ferritic Stainless Steel

“…2c) (Ref 5), and during final annealing, these bands mainly recrystallize to grain colonies with similar orientations, especially AE111ae//ND orientations, resulting in the observed AE111ae//ND-oriented grain colonies in the final sheet ( Fig. 10) ( Ref 5,8,16). In the case of two-step cold-rolling process, by contrast, additional coldrolling and annealing processes are favorable for the fragmentation of the grain colonies.…”

<i>In situ</i> Observation of the Influence of Al on Deformation-induced Twinning in TWIP Steel

“…The decrease of the CI is due to the increase of the surface roughness resulting from differences in the through-thickness deformation. 12) This deformation-induced surface topology has a negative effect on the CI, because the line of sight configuration gradually deteriorates during straining. 13) Data points with a CI less than 0.01 were therefore not considered for the data analysis, and these low CI data points appear with a black contrast in the EBSD micrographs.…”