The "quenching and partitioning" process: background and recent progress

Materials Research

John G. Speer²  Fernando C. Rizzo Assunção¹  David K. Matlock²  David V. Edmonds¹ 

[1] ,Colorado School of Mines Advanced Steel Processing and Products Research Center Golden CO ,USA

关键词: carbon partitioning;    retained austenite;    martensite;   

DOI  :  10.1590/S1516-14392005000400010

来源: SciELO

【 摘 要 】

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. These concepts are applied to silicon-containing steels that are currently being examined for low-carbon TRIP sheet steel applications, and medium-carbon bar steel applications, along with a silicon-containing ductile cast iron. Highlights of recent experimental studies on these materials are also presented, that indicate unique and attractive microstructure/property combinations may be obtained via Q&P. This work is being carried out through a collaborative arrangement sponsored by the NSF in the USA, CNPq in Brazil, and the EPSRC in the United Kingdom.

【 授权许可】

CC BY   
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