Influence of the microstructure on the tensile and impact properties of a 14Cr ODS steel bar

García-Junceda, Andrea; Hernández‐Mayoral, M.; Serrano, Marta

doi:10.1016/j.msea.2012.07.051

Cited by 42 publications

(18 citation statements)

References 27 publications

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“…FT specimens also presented a lower ductility along RD than along AD, with a fracture elongation by 50 to 70% lower and a reduction of area at fracture by 60 to 70% lower. The observed anisotropy in tensile properties agreed with results reported by [McClintock et al 2009], [García-Junceda et al, 2012] and [Steckmeyer, 2012].…”

Section: Uniaxial Tension Behaviorsupporting

confidence: 91%

Anisotropic intergranular damage development and fracture in a 14Cr ferritic ODS steel under high-temperature tension and creep

Salmon-Legagneur

Vincent

Garnier

et al. 2018

Materials Science and Engineering: A

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This work addresses damage mechanisms at high temperature of a hot extruded 14Cr oxide dispersion strengthened steel rod, in particular, anisotropy induced by its strong morphological and crystallographic texture. Under uniaxial tension, intergranular damage and unstable fracture increased with test temperature; they appeared much easier along the rod axis than perpendicular to it. Creep fracture of smooth specimens involved crack initiation from the side surfaces and intergranular crack propagation, accompanied by intergranular damage.In order to get rid of fracture surface oxidation by the air environment, a methodology promoting crack nucleation from inside the specimen was built. From tensile and creep tests on notched specimens the fracture initiation location and fracture stability were first mapped as a function of test temperature, maximal stress triaxiality and loading direction. Then, for the first time to the authors' knowledge, interrupted tests on notched tensile and creep specimens, followed by low-temperature fracture allowed revealing fracture surfaces formed at high temperature, but unconnected to the external environment. Intergranular fracture and grain boundary grooving were evidenced there, together with strong chemical reactivity at the surface of internal cavities during damage development at high temperature.

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Section: Uniaxial Tension Behaviorsupporting

confidence: 91%

Anisotropic intergranular damage development and fracture in a 14Cr ferritic ODS steel under high-temperature tension and creep

Salmon-Legagneur

Vincent

Garnier

et al. 2018

Materials Science and Engineering: A

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“…This improvement is clearly due to the precipitation of Zr nano-oxides with different compositions, which are able to generate an Orowan strengthening by pinning effectively the movement of the dislocations created during the plastic deformation of the steel. The values reached are promising since they are higher than those reported in the literature for the hipped U14YW (14 wt.% Cr) and the hot extruded PM2000 (20 wt.% Cr) ODS steels, and in the range of the hot extruded MA957 (14 wt.% Cr) and 14GET (14 wt.% Cr) ODS alloys [33][34][35][36]. In addition, SP tests are performed on the ODS steels sintered by SPS in order to analyse more deeply the influence of the Zr nano-oxides on the mechanical behaviour of these materials.…”

Section: Mechanical Characterisation Of Sps Ods Alloysmentioning

confidence: 53%

Effect of Small Variations in Zr Content on the Microstructure and Properties of Ferritic ODS Steels Consolidated by SPS

García-Junceda

Maciá

Garbiec

et al. 2020

Metals

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Two different zirconium contents (0.45 and 0.60 wt.%) have been incorporated into a Fe-14Cr-5Al-3W-0.4Ti-0.25Y2O3 oxide dispersion-strengthened (ODS) steel in order to evaluate their effect on the final microstructure and mechanical properties. The powders with the targeted compositions were obtained by mechanical alloying (MA), and subsequently processed by spark plasma sintering (SPS) at two different heating rates: 100 and 400 °C·min−1. Non-textured bimodal microstructures composed of micrometric and ultrafine grains were obtained. The increase in Zr content led to a higher percentage of Zr nano-oxides and larger regions of ultrafine grains. These ultrafine grains also seem to be promoted by higher heating rates. The effective pinning of the dislocations by the Zr dispersoids, and the refining of the microstructure, have significantly increased the strength exhibited by the ODS steels during the small punch tests, even at high temperatures (500 °C).

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“…These values are in good agreement with those reported by other authors concerning studies on 14Cr-ODS alloys produced by hot extrusion or hot isostatic pressing. 25,26 The increase in the hardness when incorporating zirconium to the ferritic matrix is probably due to the above-mentioned decrease in the mean ferritic grain size and to the presence of finer nano-oxides formed by zirconium dispersed within the ferritic matrix.…”

Section: (2) Microstructural and Mechanical Characterization Of Consomentioning

confidence: 99%

Effect of Zirconium on the Microstructure and Mechanical Properties of an Al‐Alloyed ODS Steel Consolidated by FAHP

et al. 2015

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An oxide dispersion strengthened (ODS) ferritic steel with nominal composition Fe-14Cr-5Al-3W-0.4Ti-0.25Y 2 O 3 -0.6ZrO 2 was produced by mechanical alloying (MA), based on a prealloyed grade Fe-14Cr-5Al-3W steel with the addition of Ti element, Y 2 O 3 and ZrO 2 , and subsequent consolidation by means of field assisted hot pressing (FAHP). The microstructure and the mechanical properties were analyzed and compared with a reference material with nominal composition Fe-14Cr-5Al-3W-0.4Ti-0.25Y 2 O 3 . The addition of zirconia increased the volume fraction of the smallest and equiaxed ferritic nano-grains and decreased the quantity of larger aluminum nano-oxides within the ferritic matrix, promoting the formation of fine zirconium nano-oxides and leading to the enhancement of the mechanical properties of the alloy.

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Influence of the microstructure on the tensile and impact properties of a 14Cr ODS steel bar

Cited by 42 publications

References 27 publications

Anisotropic intergranular damage development and fracture in a 14Cr ferritic ODS steel under high-temperature tension and creep

Anisotropic intergranular damage development and fracture in a 14Cr ferritic ODS steel under high-temperature tension and creep

Effect of Small Variations in Zr Content on the Microstructure and Properties of Ferritic ODS Steels Consolidated by SPS

Effect of Zirconium on the Microstructure and Mechanical Properties of an Al‐Alloyed ODS Steel Consolidated by FAHP

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