Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 620, Issue -, Pages 490-499Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.10.050
Keywords
Mechanical milling; Oxide dispersion strengthened; Ferritic-martensitic steel; Dispersoids; Microstructure; Tensile properties
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Funding
- IGCAR, Kalpakkam [IGC/MMG/MTD/MFTS/PVS/ODS/1/2007]
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Oxide dispersion strengthened (ODS) 9Cr steel was prepared by milling atomised steel powder (Fe-0.1C-9Cr-2W-0.2Ti) with nano yttria powder in a high energy horizontal ball mill (Simoloyer CM-08) for 1, 2, 3 and 4 h. Both particle as well as crystallite sizes of milled ODS steel powder reduced with milling time reaching steady state after 3 h. The grain size of the heat treated ODS steel also reduces with milling time reaching a steady state after 3 h. Four hours of milling is sufficient to get the dispersoids of less than 5 nm in heat treated ODS steel. Both yield and tensile strengths increase with milling time up to 673 K and there is no effect of milling on the strength levels beyond 673 K. (C) 2014 Elsevier B.V. All rights reserved.
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