Structural Changes in a 304-Type Austenitic Stainless Steel Processed by Multiple Hot Rolling

Abstract:

The microstructure evolution and the dynamic processes of grain refinement in a 304-type austenitic stainless steel during multiple calibre hot rolling at temperatures of 700-1000°C were studied. The structural changes are characterized by the elongation of original grains towards the rolling axis and the development of new fine grains, the mean size of which decreases with decreasing the deformation temperature. During multiple rolling at 1000°C, the new grains resulted from the development of discontinuous dynamic recrystallization involving a bulging of frequently corrugated grain boundaries. On the other hand, the new grain boundaries leading to remarkable refinement of original microstructure were developed at temperatures below 800°C as a result of continuous strain-induced reactions.

• Periodical: Advanced Materials Research (Volume 409)
• Pages: 730-735
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.409.730
• Online since: November 2011
• Authors: Zhanna Yanushkevich, Andrey Belyakov, Rustam Kaibyshev
• Keywords: Austenitic Stainless Steel, Dynamic Recovery, Dynamic Recrystallization (DRX), Ultra-Fine Grain (UFG)

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