A medium-Mn steel processed by novel twin-roll strip casting route. Issue 10 (3rd July 2019)

• Record Type: Journal Article
• Authors: Wang, Hesong; Zhang, Yuanxiang; Ran, Rong; Wang, Yang; Kang, Jian; Li, Yunjie; Misra, R. D. K.; Yuan, Guo; Wang, Guodong
• Is Part Of: Materials science and technology. Volume 35:Issue 10(2019)
• Page Start: 1227
• Page End: 1238
• Publication Date: 2019-07-03
• Subjects: Medium-Mn steel -- twin-roll strip casting -- microstructure -- mechanical properties; Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1080/02670836.2019.1618620
• Languages: English
• ISSNs: 0267-0836

Abstract

ABSTRACT: A medium-Mn steel (Fe–0.3C–4Mn–1.82Al–0.6Si wt-%) was produced by a novel processing route involving twin-roll strip casting, hot rolling and intercritical annealing (IA). Macrosegregation was absent in the as-cast strip. The microstructure of the as-cast strip consisted of martensite and austenite (∼10 vol.-%), and the solidification structure was characterised by dendritic structure. With an increase in IA temperature from 680 to 725 and to 755°C, austenite fraction in intercritically annealed steels was increased from 22 to 45% and then decreased to 27%. The 710°C intercritically annealed steel yielded excellent mechanical properties with a tensile strength of ∼1007 MPa and total elongation of ∼48%, achieved by a high volume fraction of austenite (∼42%) with appropriate mechanical stability.