Microstructural and magnetic characteristics of ceramic dispersion strengthened sintered stainless steels after thermal ageing

Csaba Balázsi, Haroune Rachid Ben Zine, Monika Furko, Zsolt Czigány, L. Almásy, Vasyl Ryukhtin, Hiroaki Murakami, Gültekin Göller, Onuralp Yucel, Filiz Cinar Sahin, Katalin Balázsi, Satoru Kobayashi, Ákos Horváth

Research output: Contribution to journalArticle

Abstract

The effect of the ultrafine grained silicon nitride and yttria addition to the morphological, structural, mechanical and magnetic properties of the ceramic dispersion strengthened 316 L stainless steels prepared by powder technology has been studied. Four composites have been prepared: 316 L/0.33 wt.% Si3N4, 316 L/1 wt.% Si3N4 (CDS) and 316 L/0.33 wt.% Y2O3, 316 L/1 wt.% Y2O3 (ODS). Spark plasma sintering (SPS) was used for fast compaction of milled composite powders. The hardness values have been found to be significantly higher in the cases of CDS and ODS samples in comparison to reference sample, whereas the ODS composites had lower smaller hardness than the CDS composites regardless the content of additives. The magnetic characterization of samples demonstrated that the samples exhibit ferromagnetic property already before ageing and a larger ferromagnetic component was observed as a result of thermal aging. It was proven that in the case of ODS and CDS samples with a low amount of Y2O3 or Si3N4 the saturation magnetization was slightly dependent on ageing time, however, it exhibited a noticeable change with ageing both at 600 and 800 °C for samples containing higher amount of additives.

Original languageEnglish
Pages (from-to)46-53
Number of pages8
JournalFusion Engineering and Design
Volume145
DOIs
Publication statusPublished - Aug 1 2019

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Keywords

  • Ceramic dispersion strengthened steels
  • EBSD
  • Hardness
  • Magnetic properties
  • Microstructure

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Balázsi, C., Zine, H. R. B., Furko, M., Czigány, Z., Almásy, L., Ryukhtin, V., Murakami, H., Göller, G., Yucel, O., Sahin, F. C., Balázsi, K., Kobayashi, S., & Horváth, Á. (2019). Microstructural and magnetic characteristics of ceramic dispersion strengthened sintered stainless steels after thermal ageing. Fusion Engineering and Design, 145, 46-53. https://doi.org/10.1016/j.fusengdes.2019.05.035