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Effects of Initial Equiaxed Crystal Ratio in As-Cast Slab on Texture Evolution and Formability of Ferritic Stainless Steel

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Abstract

In this study, as-cast ferritic stainless steel samples with columnar, equiaxed and mixed crystals were selected as initial specimens and subsequently subjected to various thermomechanical treatments, in order to investigate the effects of initial equiaxed crystal ratio on microstructure and texture evolution, final formability and ridging characteristics during subsequent processes. Results showed that the microstructures of samples with different initial equiaxed crystal ratios presented limited difference after appropriate cold-rolled annealing treatment at 880 °C and the grains were almost completely recrystallized and basically equiaxed. The texture of {111}//ND γ-fiber was mainly recorded in the final sheet, which was beneficial to improve formability. The sample with 50% initial equiaxed crystal ratio exhibited slightly rougher surface and larger ridging height after tensile straining of 20%, while Erichsen index values presented only 2.4% difference irrespective of initial equiaxed crystal ratio. It was found that initial equiaxed crystal ratio was not the main factor affecting final formability and ridging characteristics of ferritic stainless steel as limited difference was observed. Appropriate annealing treatment could improve textures and microstructures even if the initial structure contains typically mixed columnar-equiaxed grains.

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Data Availability

All data included in this study are available upon request by contact with the corresponding author.

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Acknowledgments

This work was supported by the Open Fund of State Key Laboratory of Vehicle NVH and Safety Technology (NVHSKL-201904), National Natural Science Foundation of China (51905163), and Natural Science Foundation of Hunan Province (2019JJ50053).

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Authors and Affiliations

  1. State Key Laboratory of Vehicle NVH and Safety Technology, Chongqing, 401122, China

    Maojun Li

  2. State Key Laboratory of Advanced Design and Manufacture for Vehicle Body, Hunan University, Changsha, 410082, Hunan, China

    Maojun Li & Zhuoling Wang

  3. Baosteel Research Institute (R&D Center), Baoshan Iron & Steel Co., Ltd., Shanghai, 200431, China

    Xu Chen

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  1. Maojun Li
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  2. Zhuoling Wang
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  3. Xu Chen
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Correspondence to Maojun Li.

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Li, M., Wang, Z. & Chen, X. Effects of Initial Equiaxed Crystal Ratio in As-Cast Slab on Texture Evolution and Formability of Ferritic Stainless Steel. J. of Materi Eng and Perform 30, 379–389 (2021). https://doi.org/10.1007/s11665-020-05441-1

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  • DOI: https://doi.org/10.1007/s11665-020-05441-1

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