Transcription of The “Quenching and Partitioning” Process: Background …
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The “Quenching and Partitioning” Process: Background …
Materials Research, Vol. 8, No. 4, 417-423, 2005 2005. The quenching and partitioning process : Background and Recent Progress John G. Speera, Fernando C. Rizzo Assun ob*, David K. Matlocka, David V. Edmondsc Advanced Steel Processing and Products Research center , a Colorado School of Mines, Golden, CO 80401, USA. b Department of Materials Science and Metallurgy, Pontif cia Universidad Cat lica, 22453-900 Rio de Janeiro - RJ, Brazil c School of process , Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom Received: July 19, 2004; Revised: April 8, 2005. A new process concept, quenching and partitioning (Q&P) has been proposed recently for creating steel microstructures with retained austenite. The process involves quenching austenite below the martensite- start temperature, followed by a partitioning treatment to enrich the remaining austenite with carbon, thereby stabilizing it to room temperature. The process concept is reviewed here, along with the thermodynamic basis for the partitioning treatment, and a model for designing some of the relevant processing temperatures.
Vol. 8, No 4, 2005 The “Quenching and Partitioning” Process: Background and Recent Progress 419 partitioning, or Q&P, to distinguish it mechanistically from conven-
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