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Quantitative Analysis of Microstructural Refinement in Simulated Carburized Microstructures
Journal of Materials Engineering and Performance ( IF 2.3 ) Pub Date : 2020-03-09 , DOI: 10.1007/s11665-020-04714-z
M. Agnani , O. L. DeNonno , K. O. Findley , S. W. Thompson

Abstract

Microstructure refinement strategies in simulated carburized microstructures were evaluated because of their potential for improving the fatigue performance of case-carburized components. Commercial 52100 steel was used to simulate the high-carbon content in the case. Specimens were subjected to various thermal treatments in a quenching dilatometer. Reheating cycles to austenitizing temperatures were evaluated with respect to both prior austenite grain size (PAGS) and associated martensite and retained austenite (RA) refinement. Quantitative stereological measurements were performed to evaluate the microgeometry of plate martensite and the size distribution of RA regions. Decreasing the reheating temperature resulted in finer PAGS, and multiple reheating cycles resulted in a narrower PAGS distribution. Refinement in PAGS led to a reduction in martensite plate size and finer distribution of RA. Additionally, interrupted quenching below martensite start (MS) temperature was evaluated. This processing route results in a refinement of martensite plates and more stable RA. The stabilization of austenite may be mechanical or chemical in nature, owing to the deformation of austenite during primary transformation, or due to partitioning of carbon into austenite similar to quenching and partitioning steels.



中文翻译:

模拟渗碳组织中细化组织的定量分析

摘要

评估了模拟渗碳微结构中的微结构细化策略,因为它们有可能改善表面渗碳组件的疲劳性能。商用52100钢用于模拟机壳中的高碳含量。在淬火膨胀仪中对样品进行各种热处理。针对先前的奥氏体晶粒尺寸(PAGS)以及相关的马氏体和残余奥氏体(RA)细化,评估了再加热至奥氏体化温度的循环。进行定量的立体测量以评估板状马氏体的微观几何形状和RA区的尺寸分布。降低再加热温度可以使PAGS更好,而多次再加热循环则可以使PAGS分布更窄。PAGS的细化导致马氏体板尺寸的减小和RA的更细分布。此外,马氏体开始以下淬火中断(中号小号)温度进行了评价。该加工路线导致马氏体板的细化和更稳定的RA。奥氏体的稳定化本质上可以是机械的或化学的,这归因于奥氏体在初生相变过程中的变形,或者由于碳类似于淬火和分配钢而分配到奥氏体中。

更新日期:2020-03-10
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