Effect of 6 Ferrite on Edge-Crack Formation During Hot Rolling of Austenitic Stainless Steel

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Abstract

During planetary hot rolling of 304 austenitic stainless steel, cracks are formed along the plate edges. In order to explain the mechanism of edge cracking, the metallographical quantitative analysis of microstructural inhomogeneity of steel plates containing edge cracks of different intensities is performed. The austenitic matrix of the steel contained small amounts of delta ferrite inhomogeneously distributed across the width and the thickness of the plate. A correlation was found between ferrite content and edge cracking: the higher the ferrite content the longer the edge cracks. Among the chemical elements present in the steel, the most critical effect on delta-ferrite content was exerted by carbon and nitrogen are a powerful gamma phase stabilizers at high temperature. To understand the effects of reheating parameters on the morphology and content of delta- ferrite, the specimens selected from different locations of as-cast 304 stainiess steel slab, were reheated according to the temperature profiles, which simulated the industrial reheating process before hot rolling. In general, reheating reduced the 6 ferrite content, increased the size of the individual ferrite island and changed its shape to a more sphetical. An increase of reheating time to 92 minutes caused drastic reduction in delta- ferrite content and its further spherodization. Moreover, the size of the individual ferrite islands decreased. A possible contribution of steel chemistry and reheating parameters to changes in the steel microstructure and the possibility of edge cracking, is discussed.

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APA

Engineering, M. (1999). Effect of 6 Ferrite on Edge-Crack Formation During Hot Rolling of Austenitic Stainless Steel. Engineering.

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