Tailoring the microstructure and the mechanical properties of ultrafine grained high strength ferritic steels by powder metallurgy

Three model powder materials (i) atomized, (ii) atomized + milled, and, (iii) atomized + milled + alloyed with yttria (Y sub(2)O sub(3)) and titanium were consolidated within Spark Plasma Sintering device at 850, 950 and 1050 degree C. Depending on the materials, nanostructured, or even bimodal grai...

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Bibliographic Details
Published in:Journal of nuclear materials 2015-10, Vol.465, p.54-62
Main Authors: Mouawad, B, Boulnat, X, Fabregue, D, Perez, M, de Carlan, Y
Format: Article
Language:English
Subjects:
Atomizing
Dislocations
Engineering Sciences
Grain size distribution
Materials
Mathematical models
Mechanical properties
Nanostructure
Yield stress
Yttrium oxide
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Summary:Three model powder materials (i) atomized, (ii) atomized + milled, and, (iii) atomized + milled + alloyed with yttria (Y sub(2)O sub(3)) and titanium were consolidated within Spark Plasma Sintering device at 850, 950 and 1050 degree C. Depending on the materials, nanostructured, or even bimodal grain size distribution can be observed. These structures lead to a wide range of mechanical behavior: the tensile strength at room temperature can be tailored from 500 to 1200 MPa with total elongation from 8 to 35%. The bimodal grain size distribution is believed to provide both good yield stress and ductility. Finally, a yield stress model based on the effect of solute atoms, dislocations, grains boundaries and precipitates is presented and it permits to predict accurately the experimental values for all specimens and conditions.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2015.05.053