Enhancement of FeCrAl-ODS steels through optimised SPS parameters and addition of novel nano-oxide formers
Small punch tests
TK9001-9401
Spark plasma sintering
0103 physical sciences
Nuclear engineering. Atomic power
Mechanical alloying
Zirconium
ODS steel
0210 nano-technology
Co-precipitation
DOI:
10.1016/j.net.2024.02.018
Publication Date:
2024-02-09T07:09:18Z
AUTHORS (7)
ABSTRACT
A novel approach to incorporating oxide formers into ferritic ODS production has been developed using the coprecipitation technique. This method enables the tailored design of complex nano-oxides, integrated during Mechanical Alloying (MA) and precipitated during Spark Plasma Sintering (SPS) consolidation. Findings illustrate that co-precipitation effectively produces nano-powders with customised compositions, enriching Y, Ti, and Zr in the ferritic grade to condition subsequent oxide precipitation. While the addition of Y???Ti???Zr???O nano-oxides did not prevent the formation of Y???Al???O and Al-containing nano-oxides, these were refined thanks to the presence of well-dispersed Zr. Additionally, the Spark Plasma Sintering (SPS) parameters were optimised to tailor the bimodal grain size distribution of the ODS steels, aiming for favourable strength-to-ductility ratios. Comprehensive microstructural analyses were performed using SEM, EDS, EBSD, and TEM techniques, alongside mechanical assessments involving microtensile tests conducted at room temperature and small punch tests carried out at room temperature, 300 ???C, and 500 ???C. The outcomes yielded promising findings, showcasing similar or better performance with conventionally manufactured ODS steels. This reinforces the effectiveness and success of this innovative approach.
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