Quenching & Partitioning In Stainless Steels
Journal Title: IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) - Year 2018, Vol 15, Issue 4
Abstract
In the modern age, stainless steel (SS) can be used for the variety of applications because of its unique properties-resistance to corrosion and high strength. Typically, most of the steels are quenched to obtain martensite for high strength. In line with philosophy, when the SS is worked for high strength, by way of quenching, it loses ductility and hence the formability. Thus, the loss of formability limits its applications where we need material to bend at most but not to break. Recently, a new concept, known as quenching and partitioning (Q & P) is followed to realise both high strengths as well as ductility in the same material. In the two-step Q&P process, SS is heated first to single phase zone of austenite and quenched to a temperature just below the start of martensitic transformation (Ms) where a considerable amount of soft austenite retained along with hard martensite. In the second step, the temperature of quenched SS is raised above Ms so that trapped carbon atoms in the BCT martensite can move and make austenite richer in quantity. This enriched austenite with carbon is stable at room temperature.
Authors and Affiliations
G V S Karthik, G Rakesh
Keywords
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