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- Title
Formation Mechanism of Stripe Pattern Defect in Cold-Rolled AISI 441 Stainless Steel Stabilized by Ti and Nb.
- Authors
Hou, Yuyang; Cheng, Guoguang; Kadoi, Kota; Inoue, Hiroshige; Ruan, Qiang; Pan, Jixiang; Chen, Xingrun
- Abstract
Obtaining aesthetic appearance is critical for ferritic stainless steel due to its vast application in ornamental trim. However, in production, stripe pattern defects usually appeared when the Ti and Nb contents are high, and this defect is characterized by bright and dark stripes paralleling the rolling direction. The formation mechanism of this defect has not been fully understood. This study applied roughness meter, FE-SEM, EBSD, and original position statistic distribution analysis (OPA) to characterize the stripe pattern defect. The formation mechanism was elucidated by simulation of solidification and compositional diffusion. It is novel to find that the brighter stripe presents a higher surface roughness, which is caused by the local precipitation of dense and nano-sized (Ti, Nb)C. The mechanism of dissimilar precipitation was investigated by OPA technology. As a result, stripe-like distributions of Ti and Nb were revealed with correspondence to the stripe pattern defect and led to the dissimilar precipitation of (Ti, Nb)C. The simulations clarified that the elemental distributions resulted from the segregation during solidification, which could be hardly homogenized in the thermomechanical processing.
- Subjects
FERRITIC steel; STRIPES; STAINLESS steel; SURFACE roughness
- Publication
Metallurgical & Materials Transactions. Part B, 2022, Vol 53, Issue 4, p2499
- ISSN
1073-5615
- Publication type
Article
- DOI
10.1007/s11663-022-02545-y