Microstructure characterization and strengthening mechanisms of oxide dispersion strengthened (ODS) Fe-9%Cr and Fe-14%Cr extruded bars

Chauhan, Ankur; Bergner, F.; Etienne, Auriane; Aktaa, Jarir; Carlan, Y. de; Heintze, C.; Litvinov, D.; Hernández‐Mayoral, M.; Oñorbe, E.; Radiguet, B.; Ulbricht, A.

doi:10.1016/j.jnucmat.2017.07.060

Cited by 81 publications

(41 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…%) ODS ferritic steel produced by powder metallurgy, starting from pre-alloyed 14Cr steel, TiH 2 and Y 2 O 3 powders to set the chemical composition. The ratio between yttrium, oxygen and titanium contents was set from a previous optimization work, in order to get a fine distribution of stable nano-precipitates at the end of the whole processing cycle [Ukai et al, 2017], [Chauhan et al, 2017], [Odette, 2018]. High energy ball-milling was followed by hot extrusion at 1150°C and by a 1-hour annealing treatment at 1050°C, leading to a 17-mm-diameter rod [JL Boutard et al, 2014].…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

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.

show abstract

Section: Methodsmentioning

confidence: 99%

“…[Zhong et al, 2014]). The contribution of various microstructural features such as fine grain size, high dislocation density, high density of nanosized precipitates to the room temperature strength has been recently reassessed [Chauhan et al, 2017].…”

Section: Introductionmentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…6 the apparent size of the particles as a function of their real size as reported by experimental studies using both SAXS or SANS and APT. The crosses correspond to data from recent literature [41][42][43][44][45][46][47][48][49][50][51] covering a range of alloy systems, including maraging steels, Fe-Cu alloys, ODS-steels, Al-based alloys. We simply plot the values reported in tables or graphs.…”

Section: Comparison With Experimental Reports From the Literaturementioning

confidence: 99%

Metrology of small particles and solute clusters by atom probe tomography

2020

View full text Add to dashboard Cite

Atom probe tomography (APT) is routinely used for analyzing property-enhancing particles in the nanometer-size range and below, and plays a prominent role in the analysis of solute clusters. However, the question of how well these small particles are measured has never been addressed because of a lack of a reliable benchmark. Here, to address this critical gap, we use an approach that allows direct comparison of APT and small-angle (X-Ray) scattering (SA(X)S) performed on the same material. We introduce the notion of an effective spatial resolution for the analysis of particles, which, importantly in this context, is very different than the technique's inherent spatial resolution. This effective resolution is highly specific to the system being considered, as well as the analysis conditions. There is no hard limit below which the technique will fail, but for particles with a radius of order of 2σ = 1 nm, i.e. 250 atoms, cannot be accurately measured, even though the particles are detected. This thorough metrological assessment of APT in the analysis of particles allows us to discuss the pulse spread function of the technique and the physics underpinning its limits. We conclude that great care should be taken when analysing solute clusters by APT, in particular when reporting particle size and composition.

show abstract

“…In a recent study [18], a suitable model proposing the calculation equations applied to whole range of steels, including nano ODS, was described and verified. In this model, the yield strength, σ y , was proposed to calculate according to the equation:…”

Section: Discussionmentioning

confidence: 99%

Fracture Resistance of 14Cr ODS Steel Exposed to a High Temperature Gas

Rozumová

Hadraba

Michalička

et al. 2017

Metals

View full text Add to dashboard Cite

This paper studies the impact fracture behavior of the 14%Cr Oxide Dispersion Strengthened (ODS) steel (ODM401) after high temperature exposures in helium and air in comparison to the as-received state. A steel bar was produced by mechanical alloying and hot-extrusion at 1150 • C. Further, it was cut into small specimens, which were consequently exposed to air or 99.9% helium in a furnace at 720 • C for 500 h. Impact energy transition curves are shifted towards higher temperatures after the gas exposures. The transition temperatures of the exposed states significantly increase in comparison to the as-received steel by about 40 • C in He and 60 • C in the air. Differences are discussed in terms of microstructure, surface and subsurface Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM) observations. The embrittlement was explained as temperature and environmental effects resulting in a decrease of dislocation level, slight change of the particle composition and interface/grain boundary segregations, which consequently affected the nucleation of voids leading to the ductile fracture.

show abstract

Microstructure characterization and strengthening mechanisms of oxide dispersion strengthened (ODS) Fe-9%Cr and Fe-14%Cr extruded bars

Cited by 81 publications

References 46 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

Metrology of small particles and solute clusters by atom probe tomography

Fracture Resistance of 14Cr ODS Steel Exposed to a High Temperature Gas

Contact Info

Product

Resources

About