Influence of interface mobility on the evolution of austenite-martensite grain assemblies during annealing
Influence of interface mobility on the evolution of austenite-martensite grain assemblies during annealing
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DOI：
10.1016/j.actamat.2009.06.024
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发表时间：
2009-09-01
期刊：
影响因子：
9.4
通讯作者：
Sietsma, J.
中科院分区：
文献类型：
--
作者：
Santofimia, M. J.;Speer, J. G.;Sietsma, J.
淬火和配分（Q&P）工艺是一种用于生产先进高强度钢的新型热处理工艺。该处理包括初始部分或完全奥氏体化，随后淬火以形成受控量的马氏体，以及退火步骤以将碳原子从马氏体分配到奥氏体。在这项工作中，退火过程中的马氏体-奥氏体晶粒组件的微观结构演变进行了分析，通过一个建模方法，考虑马氏体-奥氏体界面迁移的碳分配动力学的影响。在该模型中排除了碳化物沉淀，并考虑了三种不同的假设界面流动性，从一个完全不动的界面相对较高的流动性的不连贯的铁素体-奥氏体界面。模拟表明，不同的界面迁移率导致退火过程中预测的微观结构的演变的深刻差异。(C)2009 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
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. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.