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首页> 外文期刊>Ultramicroscopy >Interface segregation behavior in thermal aged austenitic precipitation strengthened stainless steel
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Interface segregation behavior in thermal aged austenitic precipitation strengthened stainless steel

机译：热时效奥氏体沉淀强化不锈钢中的界面偏析行为

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摘要

The segregation of various elements at grain boundaries, precipitate/matrix interfaces were analyzed using atom probe tomography in an austenitic precipitation strengthened stainless steel aged at 750 degrees C for different time. Segregation of P, B and C at all types of interfaces in all the specimens were observed. However, Si segregated at all types of interfaces only in the specimen aged for 16 h. Enrichment of Ti at grain boundaries was evident in the specimen aged for 16 h, while Ti did not segregate at other interfaces. Mo varied considerably among interface types, e.g. from segregated at grain boundaries in the specimens after all the aging time to never segregate at gamma'/gamma phase interfaces. Cr co-segregated with C at grain boundaries, although carbides still did not nucleate at grain boundaries yet. Despite segregation tendency variations in different interface types, the segregation tendency evolution variation of different elements depending aging time were analyzed among all types of interfaces. Based on the experimental results, the enrichment factors, Gibbs interface excess and segregation free energies of segregated elements were calculated and discussed. (C) 2015 Elsevier B.V. All rights reserved.
机译：在奥氏体沉淀强化不锈钢中，在750℃时效不同的时间下，使用原子探针层析成像技术分析了晶界，析出物/基体界面上各种元素的偏析。观察到所有样品中所有类型界面处的P，B和C偏析。然而，仅在时效16 h的样品中，Si才在所有类型的界面处偏析。时效16 h的试样中明显富集了Ti的晶界，而Ti没有在其他界面偏析。 Mo在各种界面类型之间有很大差异，例如在所有的时效时间后，它们都不会在样品的晶界处偏析，而不会在γ'/γ相界面处偏析。 Cr与C在晶界处共偏析，尽管碳化物仍未在晶界处成核。尽管在不同的界面类型中存在偏析趋势变化，但仍分析了所有类型界面之间取决于老化时间的不同元素的偏析趋势演变变化。根据实验结果，计算并讨论了富集因子，吉布斯界面过量和偏析元素的离析自由能。 （C）2015 Elsevier B.V.保留所有权利。

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