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Vacancy type defects in oxide dispersion strengthened steels

机译:氧化物弥散强化钢中的空位缺陷

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摘要

This study was focused on commercial oxide-dispersion strengthened (ODS) steels - MA 956 (20%Cr), PM 2000 (19%Cr), ODM 751 (16%Cr) and MA 957 (14%Cr) developed for fuel cladding of Generation IV reactors. The ODS steels are investigated in order to compare their microstructure features. Vacancy defects were observed by Doppler broadening spectroscopy and positron annihilation lifetime spectroscopy. Residual stress proportional to all kinds of defects was investigated by magnetic Barkhausen noise measurement. The highest presence of vacancy defects was found in MA 956 and the lowest defect concentration in MA 957, although this steel contains the largest defects (six-vacancies together with dislocations or mono-vacancies). Other investigated steels contained probably three- or four-vacancy clusters. Further, the results from the positron techniques indicated a relation between the chromium content and the defect concentration. The magnetic Barkhausen noise results also showed that a peak position (describing a grain size) increased with the chromium content. However residual stress was independent of a chromium level.
机译:这项研究的重点是商用氧化物弥散强化(ODS)钢-为燃料包壳开发的MA 956(20%Cr),PM 2000(19%Cr),ODM 751(16%Cr)和MA 957(14%Cr)第四代反应堆为了比较ODS钢的微观组织特征,对其进行了研究。通过多普勒增宽光谱和正电子an没寿命光谱观察到空位缺陷。通过磁性巴克豪森噪声测量研究了与各种缺陷成比例的残余应力。尽管这种钢包含最大的缺陷(六个空位以及位错或单空位),但在MA 956中发现的空位缺陷出现率最高,而在MA 957中的缺陷浓度最低。其他调查的钢可能包含三个或四个空位簇。此外,来自正电子技术的结果表明铬含量与缺陷浓度之间的关系。巴克豪森磁噪声的结果还表明,峰值位置(描述晶粒尺寸)随铬含量的增加而增加。但是,残余应力与铬含量无关。

著录项

  • 来源
  • 会议地点 Smolenice Castle(SK)
  • 作者单位

    Institute of Nuclear and Physical Engineering, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology, Ilkovicova 3, 812 19 Bratislava, Slovakia;

    Institute of Nuclear and Physical Engineering, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology, Ilkovicova 3, 812 19 Bratislava, Slovakia;

    Institute of Nuclear and Physical Engineering, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology, Ilkovicova 3, 812 19 Bratislava, Slovakia;

    Department of Applied Physics, Aalto University School of Science and Technology, P.O.Box 11100, FI-00076 Aalto, Finland;

    Department of Applied Physics, Aalto University School of Science and Technology, P.O.Box 11100, FI-00076 Aalto, Finland;

    Institute for Energy, Joint Research Centre of the European Commission, P.O. Box 2,1755ZG Petten, Netherlands;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ODS steels; Positron Annihilation Lifetime Spectroscopy; Doppler Broadening Spectroscopy; Magnetic Barkhausen Noise;

    机译:ODS钢;正电子An没寿命谱;多普勒增宽光谱;巴克豪森电磁噪声;

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