Abstract
The present study investigated the microstructure evolution and mechanical behavior in a low carbon CMnSiAl transformation-induced plasticity (TRIP) steel, which was subjected to a partial austenitization at 1183 K (910 °C) followed by one-step quenching and partitioning (Q&P) treatment at different isothermal holding temperatures of [533 K to 593 K (260 °C to 320 °C)]. This thermal treatment led to the formation of a multi-phase microstructure consisting of ferrite, tempered martensite, bainitic ferrite, fresh martensite, and retained austenite, offering a superior work-hardening behavior compared with the dual-phase microstructure (i.e., ferrite and martensite) formed after partial austenitization followed by water quenching. The carbon enrichment in retained austenite was related to not only the carbon partitioning during the isothermal holding process, but also the carbon enrichment during the partial austenitization and rapid cooling processes, which has broadened our knowledge of carbon partitioning mechanism in conventional Q&P process.
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Deakin University’s Advanced Characterization Facility is acknowledged for use of the EM and X-ray instruments. Financial support provided by the Australian Automotive Technology Cooperative Research Centre (AutoCRC) 2020 HDR scholarship is gratefully acknowledged.
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Kong, H., Chao, Q., Cai, M.H. et al. Microstructure Evolution and Mechanical Behavior of a CMnSiAl TRIP Steel Subjected to Partial Austenitization Along with Quenching and Partitioning Treatment. Metall Mater Trans A 49, 1509–1519 (2018). https://doi.org/10.1007/s11661-018-4525-3
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DOI: https://doi.org/10.1007/s11661-018-4525-3