期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.08.094
关键词
Alloys; Q&P treatment; Ferrite; Martensite; Retained austenite; Mechanical properties
类别
资金
- Tata Steel Limited, Jamshedpur, India [3000084687/102]
A novel high-strength steel has been made through thermo-mechanical controlled processing with the finish rolling temperature of 750 degrees C followed by air cooling. Subsequently, both partial austenitisation at 800 degrees C and fully austenitisation at 930 degrees C have been attempted for equal duration of 30 min prior to one step quenching and partitioning (Q&P) at 345 degrees C below M-s temperature (365 degrees C). As-rolled steel reveals ferrite-bainite-martensite microstructures with a good combination of strength and ductility. After Q&P, all the specimens have exhibited the multiphase microstructures comprising ferrite, lath microstructure (martensite and bainite), and retained austenite with the volume fractions of up to 10.50 wt%. It is evident that partitioning for 30 min leads to good carbon enrichment (> 1 wt%) of the austenite phase from the neighbouring martensite or bainite which might be due to fast partitioning kinetics and possible suppression of carbides through a combination of Si and Al additions. The attractive combination of tensile strength (921-922 MPa) and ductility (25-26% total elongation) along with low yield ratio (0.63-0.69) are attributed to ferrite and lath microstructures along with the thin film like carbon enriched retained austenite obtained after Q&P process. (C) 2016 Elsevier B.V. All rights reserved.
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