Development of New 14 Cr ODS Steels by Using New Oxides Formers and B as an Inhibitor of the Grain Growth

Metals

Luis Antonio Díaz¹  Alberto Meza²  Eric Macía²  Mónica Campos²  María Eugenia Rabanal²  Paul Chekhonin³  Eberhard Altstadt³  Andrea García-Junceda⁴  Marta Serrano⁵ 

[1] Centro de Investigación en Nanomateriales Y Nanotecnologia (CINN-CSIC-UNIOVI-PA), Grupo de Materiales Nanocompuetos y Bioinspirados, Av. de la Vega, 4-6, 33940 El Entrego, Spain;Department Materials Science and Engineering, IABB, Universidad Carlos III de Madrid (UC3M), Av. de la Universidad 30, 28911 Leganés, Spain;Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Bautzner Landstraße 400, 01328 Dresden, Germany;IMDEA Materials Institute, C/Eric Kandel 2, 28906 Getafe, Spain;Materials for Energy Interest Division, CIEMAT, Av. de la Complutense 40, 28040 Madrid, Spain;

关键词: ODS steel;    mechanical alloying;    spark plasma sintering;    boron;    complex oxides;    small punch tests (SP);   

DOI  :  10.3390/met10101344

来源: DOAJ

【 摘 要 】

In this work, new oxide dispersion strengthened (ODS) ferritic steels have been produced by powder metallurgy using an alternative processing route and characterized afterwards by comparing them with a base ODS steel with Y₂O₃ and Ti additions. Different alloying elements like boron (B), which is known as an inhibitor of grain growth obtained by pinning grain boundaries, and complex oxide compounds (Y-Ti-Zr-O) have been introduced to the 14Cr prealloyed powder by using mechanical alloying (MA) and were further consolidated by spark employing plasma sintering (SPS). Techniques such as x-ray diffraction (XRD), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM) were used to study the obtained microstructures. Micro-tensile tests and microhardness measurements were carried out at room temperature to analyze the mechanical properties of the differently developed microstructures, which was considered to result in a better strength in the ODS steels containing the complex oxide Y-Ti-Zr-O. In addition, small punch (SP) tests were performed to evaluate the response of the material under high temperatures conditions, under which promising mechanical properties were attained by the materials containing Y-Ti-Zr-O (14Al-X-ODS and 14Al-X-ODS-B) in comparison with the other commercial steel, GETMAT. The differences in mechanical strength can be attributed to the precipitate’s density, nature, size, and to the density of dislocations in each ODS steel.

【 授权许可】

Unknown