Print Email Facebook Twitter A Novel Approach for Controlling the Band Formation in Medium Mn Steels Title A Novel Approach for Controlling the Band Formation in Medium Mn Steels Author Farahani, H. (TU Delft Novel Aerospace Materials) Xu, W. (Northeastern University China) van der Zwaag, S. (TU Delft Novel Aerospace Materials) Date 2018 Abstract Formation of the microstructural ferrite/pearlite bands in medium Mn steels is an undesirable phenomenon commonly addressed through fast cooling treatments. In this study, a novel approach using the cyclic partial phase transformation concept is applied successfully to prevent microstructural band formation in a micro-chemically banded Fe-C-Mn-Si steel. The effectiveness of the new approach is assessed using the ASTM E1268-01 standard. The cyclic intercritical treatments lead to formation of isotropic microstructures even for cooling rates far below the critical one determined in conventional continuous cooling. In contrast, isothermal intercritical experiments have no effect on the critical cooling rate to suppress microstructural band formation. The origin of the suppression of band formation either by means of fast cooling or a cyclic partial phase transformation is investigated in detail. Theoretical modeling and microstructural observations confirm that band formation is suppressed only if the intercritical annealing treatment leads to partial reversion of the austenite-ferrite interfaces. The resulting interfacial Mn enrichment is responsible for suppression of the band formation upon final cooling at low cooling rates. To reference this document use: http://resolver.tudelft.nl/uuid:cc42bd89-77d9-4011-951c-1af6212b6e90 DOI https://doi.org/10.1007/s11661-018-4565-8 ISSN 1073-5623 Source Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science, 49 (6), 1998–2010 Bibliographical note green Part of collection Institutional Repository Document type journal article Rights © 2018 H. Farahani, W. Xu, S. van der Zwaag Files PDF 10.1007_s11661_018_4565_8.pdf 8.34 MB Close viewer /islandora/object/uuid:cc42bd89-77d9-4011-951c-1af6212b6e90/datastream/OBJ/view