The mechanisms of microstructure formation in a nanostructured oxide dispersion strengthened FeAl alloy obtained by spark plasma sintering

Ji, Gang; Grosdidier, Thierry; Bozzolo, Nathalie; Launois, Sébastien

doi:10.1016/j.intermet.2006.03.006

Cited by 89 publications

(63 citation statements)

References 39 publications

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“…In the case of ODS steels, Ti is well known to refine the dispersion through the precipitation of ultrafine (3 nm) Y-Ti-O particles with a high number density, resulting in the significant enhancement of high-temperature creep properties and the incrementation of operating temperatures by about 100 K. This has consequently brought about the rapid development of ODS steels [11][12][13][14]. Al is the prerequisite element for the development of Co-base ODS alloys combined with c strengthening, but it is prone to bond with Y 2 O 3 and causes the coarsening of oxides [15][16][17]. Therefore, how to reduce the particle size becomes the most important problem.…”

Section: Introductionmentioning

confidence: 99%

Y2O3 evolution and dispersion refinement in Co-base ODS alloys

et al. 2009

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Section: Introductionmentioning

confidence: 99%

Y2O3 evolution and dispersion refinement in Co-base ODS alloys

et al. 2009

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“…The powder with an initial composition of Fe40Al-0.05Zr (at.%) + 50 ppm B was prealloyed by gas atomization and subsequently ball-milled. Boron and zirconium were introduced as alloying elements to improve ductility in the material ( Ref 9,24,25) and yttria (ODS, oxide dispersed strengthening) was added during the milling step in order to keep fine grain size after hot consolidation and forming so that mechanical strength (Hall-Petch mechanism) and room temperature ductility (reduction of the environmental embrittlement caused by water vapor at RT thanks to grain size reduction down to 1 lm) are improved (Ref [26][27][28].…”

Section: Methodsmentioning

confidence: 99%

Erosion, Abrasive, and Friction Wear Behavior of Iron Aluminide Coatings Sprayed by HVOF

et al. 2008

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Iron aluminides have been proposed lately as promising materials for wear applications. Many authors have focused their investigations on the friction behavior of FeAl coatings, emphasizing the role of this intermetallic phase as a new matrix to embed ceramic particles and replace the extensively studied WCCo cermet system for high temperature. However, few of these studies deal with the evaluation of the different tribological properties and their relationship with the coating microstructure. In the present study, the near stoichometric Fe40Al was successfully sprayed by means of high velocity oxy-fuel using different particle size distribution and the tribological behavior was assessed through solid particle erosion, abrasive and dry sliding tests. The wear mechanisms of the deposited coatings are discussed with regard to the observed results. In addition, oxidized samples were tested to evaluate the role of the oxide top layer; also, the powder was previously annealed to produce a coating with an almost fully ordered FeAl structure.

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“…The samples are then submitted to annealing around 1100 • C for 1-2 h. In the last years the attention has been focused on Spark Plasma Sintering (SPS), a novel pressure assisted consolidation technology characterized by high heating rate, low sintering temperature, and short isothermal time at sintering temperature [13,14]. In the past, it has been successfully used by one of the authors to process nanostructured Fe-Mo powders [15] and more recently applied to ODS steels by Ji et al [16]. Even if Boulnat et al [17] were able to process a semi-industrial dense pellet (0.5 kg) of ODS ferritic steel, large mechanical parts are in general quite difficult and expensive to prepare by means of SPS.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Characterization of a Nano-ODS Steel Prepared by Low-Energy Mechanical Alloying

Sanctis

Fava

Lovicu

et al. 2017

Metals

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An oxide dispersion strengthened (ODS) ferritic steel with nanometric grain size has been produced by low-energy mechanical alloying (MA) of steel powder (Fe-14Cr-1W-0.4Ti) mixed with Y 2 O 3 particles (0.3 wt %) and successive hot extrusion (HE). The material exhibits superior mechanical properties with respect to the unreinforced steel up to 400 • C; then such differences tend to progressively decrease and at 700 • C yield stress (YS) and ultimate tensile strength (UTS) values are very close. The microstructure and mechanical behaviour have been compared with those of ODS steels prepared by the most common process, high-energy MA, consolidation through hot isostatic pressing (HIP) or hot extrusion (HE), annealing around 1100 • C for 1-2 h. The main strengthening mechanisms have been examined and discussed to explain the different behaviour. In addition, heat treatments in the range 1050-1150 • C were carried out and a microstructural evolution with a relevant hardness decrease has been observed. TEM observations evidenced defect recovery and partial grain coarsening owing to the not perfectly homogeneous distribution of oxide particles.

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The mechanisms of microstructure formation in a nanostructured oxide dispersion strengthened FeAl alloy obtained by spark plasma sintering

Cited by 89 publications

References 39 publications

Y2O3 evolution and dispersion refinement in Co-base ODS alloys

Y2O3 evolution and dispersion refinement in Co-base ODS alloys

Erosion, Abrasive, and Friction Wear Behavior of Iron Aluminide Coatings Sprayed by HVOF

Mechanical Characterization of a Nano-ODS Steel Prepared by Low-Energy Mechanical Alloying

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