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

Mouawad, Bassem; Boulnat, Xavier; Fabrègue, Damien; Perez, Michel; Carlan, Y. de

doi:10.1016/j.jnucmat.2015.05.053

Cited by 44 publications

(11 citation statements)

References 55 publications

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“…Since the fraction and the size of the UFG in bimodally structured metallic materials is a key parameter that controls the mechanical properties [12,13,34], this comprehensive relationship between the solute content and the UFG could be applied to tailor the mechanical properties of ODS ferritic steels.…”

Section: Resultsmentioning

confidence: 99%

Influence of oxide volume fraction on abnormal growth of nanostructured ferritic steels during non-isothermal treatments: An in situ study

Boulnat¹,

Sallez²,

Dadé³

et al. 2015

Acta Materialia

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Section: Resultsmentioning

confidence: 99%

Influence of oxide volume fraction on abnormal growth of nanostructured ferritic steels during non-isothermal treatments: An in situ study

Boulnat¹,

Sallez²,

Dadé³

et al. 2015

Acta Materialia

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“…The pre-alloyed powders are mechanically alloyed with the addition of nanosized oxides and other elements. Hot extrusion (HE), spark plasma sintering (SPS), and hot isostatic pressing (HIP) are the frequently used sintering methods for the consolidation of ODS steel [ 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ]. The final product of ODS steel is a cladding tube, which means that hot or cold working is inevitable during the fabrication process [ 1 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Hot Deformation Behavior and Microstructure Evolution of 14Cr ODS Steel

Zhao

et al. 2018

Materials

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Hot deformation tests of 14Cr oxide dispersion strengthened (ODS) steel fabricated by mechanical alloying and hot isostatic pressing (HIP) were performed on a Gleeble-1500D simulator at temperatures ranging from 1050 to 1200 °C with the strain rate range of 0.001−1 s−1. The relationship between the rheological stress and the deformation condition was studied, and a processing map at the true strain of 0.5 was proposed. Microstructure evolution during the deformation process and the effects of deformation conditions on microstructures were also investigated, as well as the stability of nanoparticles. Results show that the 14Cr ODS steel possesses positive strain rate sensitivity. The flow stress increases with the decrease of deformation temperature and the increase of strain rate. The recrystallization process is promoted by the increase of deformation temperature and the reduction of strain rate. Nanoparticles possess excellent stability during the deformation process and are coherent with the matrix.

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“…A strategy that attempts to achieve bimodal grain size distribution can compensate the low ductility of the NG/UFG metals to synergize high strength and good ductility. [2][3][4][5][6][7] Bimodal nanostructured (NS) metals, composed of the NG/UFG matrix and coarse-grained (CG) inclusions, have been fabricated by powder metallurgy [8][9][10] or severe plastic deformation followed by thermal annealing. [2,[11][12][13] In the tailored bimodal structures, the NG/UFG matrix sustains the high overall strength due to the Hall-Petch relationship, whereas the CG inclusions endow the good overall ductility because of multiple mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Microstructure‐Property Relations in the Tensile Behavior of Bimodal Nanostructured Metals

et al. 2020

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Bimodal nanostructured (NS) metals realize the superior strength due to the strengthening of nanograined (NG) matrix, whereas their high ductility arises from the toughening of coarse‐grained (CG) inclusions. Their overall strength and ductility can be influenced by 1) the fracture properties of CG and NG phases, 2) the distribution of CG inclusions, and 3) interfaces. Herein, a 3D cohesive finite element framework is built up and three classes of cohesive elements are developed: 1) cohesive elements embedded into the CG phase, 2) those embedded at the CG–NG interfaces, and 3) those embedded into the NG phase, to examine the tensile fracture of the bimodal NS Cu. The results indicate that the cohesive strength of NG phase is decisive to the overall performances and it also affects the roles of both the cohesive strength of CG phase and the distribution of CG inclusions. When the CG inclusions are array‐arranged in the interior of the entire microstructure, the best overall strength and ductility can be obtained. In addition to these, both the strength and ductility of the bimodal NS Cu get stabilized when the cohesive strength and the fracture energy of interfaces are larger than those of CG phase.

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

Cited by 44 publications

References 55 publications

Influence of oxide volume fraction on abnormal growth of nanostructured ferritic steels during non-isothermal treatments: An in situ study

Influence of oxide volume fraction on abnormal growth of nanostructured ferritic steels during non-isothermal treatments: An in situ study

Hot Deformation Behavior and Microstructure Evolution of 14Cr ODS Steel

Microstructure‐Property Relations in the Tensile Behavior of Bimodal Nanostructured Metals

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