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  4. Microstructure examination of Fe-14Cr ODS ferritic steels produced through different processing routes
 
research article

Microstructure examination of Fe-14Cr ODS ferritic steels produced through different processing routes

Oksiuta, Z.
•
Hosemann, P.
•
Vogel, S. C.
Show more
2014
Journal Of Nuclear Materials

Various thermo-mechanical treatments were applied to refine and homogenise grain size and improve mechanical properties of hot-isostatically pressed (HIP) 14%Cr ODS ferritic steel. The grain size was reduced, improving mechanical properties, tensile strength and Charpy impact, however bimodal-like distribution was also observed. As a result, larger, frequently elongated grains with size above 1 mu m and refined, equiaxed grains with a diameter ranging from 250 to 500 nm. Neutron diffraction measurements revealed that for HIP followed by hydrostatic extrusion material the strongest fiber texture was observed oriented parallel to the extrusion direction. In comparison with hot rolling and hot pressing methods, this material exhibited promising mechanical properties: the ultimate tensile strength of 1350 MPa, yield strength of 1280 MPa, total elongation of 21.7% and Charpy impact energy of 5.8 J. Inferior Charpy impact energy of similar to 3.0J was measured for HIP and hot rolled material, emphasising that parameters of this manufacturing process still have to be optimised. As an alternative manufacturing route, due to the uniform microstructure and simplicity of the process, hot pressing might be a promising method for production of smaller parts of ODS ferritic steels. Besides, the ductile-to-brittle transition temperature of all thermo-mechanically treated materials, in comparison with as-HIPped ODS steel, was improved by more than 50%, the transition temperature ranging from 50 to 70 degrees C (323 and 343 K) remains still unsatisfactory. (C) 2014 Elsevier B.V. All rights reserved.

  • Details
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Type
research article
DOI
10.1016/j.jnucmat.2014.04.004
Web of Science ID

WOS:000338618600040

Author(s)
Oksiuta, Z.
Hosemann, P.
Vogel, S. C.
Baluc, N.
Date Issued

2014

Publisher

Elsevier Science Bv

Published in
Journal Of Nuclear Materials
Volume

451

Issue

1-3

Start page

320

End page

327

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CRPP  
SPC  
Available on Infoscience
August 29, 2014
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/106254
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