Evolution of Microstructure and Texture During Warm Rolling of a Duplex Steel

• Published in: Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2014-04, Vol.45 (4), p.2180-2191
• Main Authors: Bhattacharjee, Pinaki Prasad, Zaid, M., Sathiaraj, G. D., Bhadak, B.
• Format: Article
• Language: English
• Subjects: Applied sciences; Austenite; Austenitic stainless steel; Characterization and Evaluation of Materials; Chemistry and Materials Science; Evolution; Exact sciences and technology; Ferrite; Ferrites; Lamellar structure; Materials Science; Metallic Materials; Metallurgy; Metals. Metallurgy; Microstructure; Nanotechnology; Rolling texture; Steel; Structural Materials; Surface layer; Surfaces and Interfaces; Texture; Thin Films; Warm rolling
• ISSN: 1073-5623; 1543-1940
• DOI: 10.1007/s11661-013-2139-3

The effect of warm rolling on the evolution of microstructure and texture in a duplex stainless steel (DSS) was investigated. For this purpose, a DSS steel was warm rolled up to 90 pct reduction in thickness at 498 K, 698 K, and 898 K (225 °C, 425 °C, and 625 °C). The microstructure with an alternate arrangement of deformed ferrite and austenite bands was observed after warm rolling; however, the microstructure after 90 pct warm rolling at 498 K and 898 K (225 °C and 625 °C) was more lamellar and uniform as compared to the rather fragmented and inhomogeneous structure observed after 90 pct warm rolling at 698 K (425 °C). The texture of ferrite in warm-rolled DSS was characterized by the presence of the RD (〈011〉//RD) and ND (〈111〉//ND) fibers. However, the texture of ferrite in DSS warm rolled at 698 K (425 °C) was distinctly different having much higher fraction of the RD-fiber components than that of the ND-fiber components. The texture and microstructural differences in ferrite in DSS warm rolled at different temperatures could be explained by the interaction of carbon atoms with dislocations. In contrast, the austenite in DSS warm rolled at different temperatures consistently showed pure metal- or copper-type deformation texture which was attributed to the increase in stacking fault energy at the warm-rolling temperatures. It was concluded that the evolution of microstructure and texture of the two constituent phases in DSS was greatly affected by the temperature of warm rolling, but not significantly by the presence of the other phase.