Title: Anisotropic Mechanical Properties of the MA956 ODS Steel Characterized by the Small Punch Testing Technique
Citation: JOURNAL OF NUCLEAR MATERIALS vol. 428 no. 1-3 p. 76-81
Publication Year: 2012
JRC N°: JRC66756
ISSN: 0022-3115
URI: http://www.elsevier.com/locate/jnucmat
DOI: 10.1016/j.jnucmat.2011.08.042
Type: Articles in periodicals and books
Abstract: The small punch testing technique was used to assess both creep and fracture properties of the MA956 oxide dispersion strengthened ferritic steel. The anisotropy in mechanical properties was addressed, as well as the alloy’s susceptibility to thermal embrittlement. Strong anisotropy was found in the material’s creep resistance at 725 °C for longer rupture times. Anisotropic behavior was also observed for the ductile–brittle transition temperature (DBTT). The origin of the anisotropy can be related to the strongly directional microstructure which enables a large amount of intergranular cracking during straining at both high and low temperatures. The DBTT of the alloy is very high, and can be further increased by at least 200 °C after 1000 h of ageing at 475 °C, due to the formation of the Cr-rich α´ phase. The particularly high susceptibility of the MA956 to thermal embrittlement is mainly a consequence of its high chromium content.
JRC Directorate:Energy, Transport and Climate

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