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Metals 2018, 8(2), 109; https://doi.org/10.3390/met8020109

Reversed Microstructures and Tensile Properties after Various Cold Rolling Reductions in AISI 301LN Steel

1
Kerttu Saalasti Institute, Future Manufacturing Technology Group, University of Oulu, Pajatie 5, FI-85500 Nivala, Finland
2
Centre for Advanced Steels Research, University of Oulu, P.O. Box 4200, FI-90014 Oulu, Finland
*
Author to whom correspondence should be addressed.
Received: 10 January 2018 / Revised: 24 January 2018 / Accepted: 2 February 2018 / Published: 6 February 2018
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Abstract

Heavy cold rolling is generally required for efficient grain size refinement in the martensitic reversion process, which is, however, not desirable in practical processing. In the present work, the influence of cold rolling reductions of 32%, 45% and 63% on the microstructure evolution and mechanical properties of a metastable austenitic AISI 301LN type steel were investigated in detail adopting scanning electron microscopy with the electron backscatter diffraction method and mechanical testing. A completely austenitic microstructure and a partially reversed counterpart were created. It was found that the fraction of grains with a size of 3 µm or larger, called medium-sized grains, increased with decreasing the prior cold rolling reduction. These grains are formed mainly from the shear-reversed austenite, transformed from slightly-deformed martensite, by gradual evolution of subgrains to grains. However, in spite of significant amounts of medium-sized grains, the tensile properties after the 32% or 45% cold rolling reductions were practically equal to those after the 63% reduction. The austenite stability against the formation of deformation-induced martensite in subsequent straining was reduced by lowering the cold rolling reduction, due to the larger grain size of medium-sized grains and the shift of their orientation towards {211} <uvw>. View Full-Text
Keywords: austenitic stainless steel; cold rolling reduction; reversion treatment; grain size; tensile properties; austenite stability austenitic stainless steel; cold rolling reduction; reversion treatment; grain size; tensile properties; austenite stability
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Järvenpää, A.; Jaskari, M.; Karjalainen, L.P. Reversed Microstructures and Tensile Properties after Various Cold Rolling Reductions in AISI 301LN Steel. Metals 2018, 8, 109.

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