Influence of interface mobility on the evolution of Austenite-Martensite grain assemblies during annealing

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The quenching and partitioning (Q&P) process is a new heat treatment for the creation of advanced high-strength steels. This treatment consists of an initial partial or full austenitization, followed by a quench to form a controlled amount of martensite and an annealing step to partition carbon atoms from the martensite to the austenite. In this work, the microstructural evolution during annealing of martensite-austenite grain assemblies has been analyzed by means of a modeling approach that considers the influence of martensite-austenite interface migration on the kinetics of carbon partitioning. Carbide precipitation is precluded in the model, and three different assumptions about ... continued below

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Clarke, Amy J; Santofimia, Maria J; Speer, John G; Zhao, L & Sietsma, Jilt January 1, 2009.

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The quenching and partitioning (Q&P) process is a new heat treatment for the creation of advanced high-strength steels. This treatment consists of an initial partial or full austenitization, followed by a quench to form a controlled amount of martensite and an annealing step to partition carbon atoms from the martensite to the austenite. In this work, the microstructural evolution during annealing of martensite-austenite grain assemblies has been analyzed by means of a modeling approach that considers the influence of martensite-austenite interface migration on the kinetics of carbon partitioning. Carbide precipitation is precluded in the model, and three different assumptions about interface mobility are considered, ranging from a completely immobile interface to the relatively high mobility of an incoherent ferrite-austenite interface. Simulations indicate that different interface mobilities lead to profound differences in the evolution of microstructure that is predicted during annealing.

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  • Journal Name: Acta Materialia

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  • Report No.: LA-UR-09-01638
  • Report No.: LA-UR-09-1638
  • Grant Number: AC52-06NA25396
  • Office of Scientific & Technical Information Report Number: 956590
  • Archival Resource Key: ark:/67531/metadc926282

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 2009

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 12:16 p.m.

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Clarke, Amy J; Santofimia, Maria J; Speer, John G; Zhao, L & Sietsma, Jilt. Influence of interface mobility on the evolution of Austenite-Martensite grain assemblies during annealing, article, January 1, 2009; [New Mexico]. (digital.library.unt.edu/ark:/67531/metadc926282/: accessed April 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.