ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Development of Ultrafine Lamellar Ferrite and Austenite Duplex Structure in 0.2C5Mn Steel during ART-annealing
Chang Wang, Jie Shi, Cun Yu Wang, Wei Jun Hui, Mao Qiu Wang, Han Dong, Wen Quan Cao
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Keywords: austenite reverted transformation (ART), manganese partitioning, ultrafine lamellar duplex structure, Kurdjumov-Sachs orientation relashionship, intercritical annealing
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2011 Volume 51 Issue 4 Pages 651-656

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Abstract

The microstructural evolution of Fe–0.2C–5Mn steel during intercritical annealing with holding time for up to 144 hours was examined by TEM and STEM. It was demonstrated by TEM that the martensite lath structure gradually transformed into a lamellar ferrite and austenite duplex structure. The partitioning of manganese from ferrite to austenite was found by STEM. Typical Kurdjumov-Sachs orientation relationship between austenite lath and ferrite lath was observed by electron back scattered diffraction (EBSD). Based on the analysis of the austenite lath thckening behavior, it was proposed that the Mn-partitioning in austenite dominated the microstructure evolution of the ultrafine lamellar ferrite and austenite duplex structure during annealing process.

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© 2011 by The Iron and Steel Institute of Japan
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