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Reduced activation ODS ferritic steel – recent development in high speed hot extrusion processing
Author(s) -
Oksiuta Zbigniew,
Lewandowska Małgorzata,
Kurzydlowski Krzysztof,
Baluc Nadine
Publication year - 2010
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200983365
Subject(s) - materials science , charpy impact test , extrusion , microstructure , ultimate tensile strength , metallurgy , hot isostatic pressing , grain size , alloy
The paper presents the microstructure and mechanical properties of an oxide dispersion strengthened (ODS), reduced activation, ferritic steel, namely the Fe‐14Cr‐2W‐0.3Ti‐0.3Y 2 O 3 alloy, which was fabricated by hot isostatic pressing followed by high speed hydrostatic extrusion (HSHE) and heat treatment HT at 1050 °C. Transmission electron microscopy (TEM) observations revealed significant differences in the grain size and dislocation density between the as‐HIPped and as‐HSHE materials. It was also found that the microstructure of the steel is stable after HT. The HSHE process improves significantly the tensile and Charpy impact properties of the as‐HIPped steel. The ultimate tensile strength at room temperature increases from 950 up to 1350 MPa, while the upper shelf energy increases from 3.0 up to 6.0 J. However, the ductile‐to‐brittle transition temperature (DBTT) remains relatively high (about 75 °C).These results indicate that HSHE is a promising method for achieving grain refinement and thus improving the mechanical properties of ODS ferritic steels.