Microstructural evolution and mechanical behaviour of high strength steel treated by quenching and partitioning process. (2017)

• Record Type: Journal Article
• Authors: Mandal, G.; Ghosh, S.K.
• Is Part Of: Materials today. Volume 4:Number 9(2017)
• Page Start: 9418
• Page End: 9422
• Publication Date: 2017
• Subjects: TMCP -- Quenching and partitioning -- Microstructure -- Mechanical properties; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2017.06.196
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: The present steel has been processed through thermo-mechanical controlled processing (TMCP) with the finish rolling temperature (FRT) of 850°C followed by air cooling (AC). Subsequently, the steel was subjected to partial (800°C) and full austenitisation (930°C) followed by quenching and partitioning (Q&P) process at 345°C below MS (365°C) temperature. The steel in as-rolled condition reveals mixed microstructures comprising ferrite and bainite with yield strength of 560 MPa and tensile strength of 1063 MPa along with an average total elongation of 15%. The attractive combination of tensile strength (933-1000 MPa) and ductility (26-29% total elongation) are attributed to the multiphase microstructure comprising ferrite, lath martensite and thin film like carbon enriched retained austenite after one step Q&P process.