Tailoring the secondary phases and mechanical properties of ODS steel by heat treatment

Zhao, Qian; Ma, Zongqing; Yu, Liming; Li, Huijun; Liu, Chenxi; Li, Chong; Liu, Yongchang

doi:10.1016/j.jmst.2018.12.008

Cited by 36 publications

(10 citation statements)

References 61 publications

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“…In parallel, the powerlaw exponent n evolves from values close to 3 to values close to 4, consistently between unstrengthened and ODS steels. This comforts the scenario of an initial high density of dislocations, which decreases during heating, and of the formation of coarse carbides and oxides which are known to occur in these steels [31,[39][40][41][42]. The power-law contribution is greater than average on the ex-situ CP specimens heated until 500°C and 1100°C at 10°C/min (Fig.…”

supporting

confidence: 79%

Nano-oxide precipitation kinetics during the consolidation process of a ferritic oxide dispersion strengthened steel.

et al. 2020

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Oxide Dispersion Strengthened (ODS) steels are candidates for nuclear applications. ODS are produced by mechanical alloying of Fe-14Cr, Y2O3 and TiH2 powders and consolidation at 1100°C, resulting in finely dispersed nano-oxides. Their precipitation kinetics has been quantitatively determined by in-situ Small Angle X-ray Scattering during continuous heating up to 1100°C. Clusters, found in the as-milled state start growing at 450°C until 1100°C, while almost no coarsening was recorded during subsequent isothermal annealing. The nano-oxides resulting from these in-situ experiments were found to be representative of those in materials processed by hot isostatic pressing and hot extrusion.

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supporting

confidence: 79%

Nano-oxide precipitation kinetics during the consolidation process of a ferritic oxide dispersion strengthened steel.

et al. 2020

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“…With the increase of annealing temperature, M 23 C 6 particles were dissolved and TiC precipitation was promoted. No coarsening of Y 2 Ti 2 O 7 was found [80] . Fe-14Cr ODS alloy was prepared by mechanical alloying and spark plasma sintering, and annealed at different temperatures.…”

Section: In-situ Reaction Methodsmentioning

confidence: 90%

Application of nanoparticles in cast steel: An overview

et al. 2020

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The innovative and environmentally friendly methodologies for comprehensively enhancing the performances of high-strength steels without damage to plasticity, toughness and heat/corrosion/fatigue resistance are being developed. In recent years, nanoparticles elevate the field of high-strength steel. It is proposed that nanoparticles have the potential to replace conventional semi-coherent intermetallic compounds, carbides and alloying to optimize the steel. The fabrication process is simplified and the cost is lower compared with the traditional methods. Considerable research effort has been directed towards high-performance cast steels reinforced with nanoparticles due to potential application in major engineering. Nanoparticles are found to be capable of notably optimizing the nucleation behavior and precipitate process. The prominently optimized microstructure configuration and performances of cast steel can be acquired synchronously. In this review, the lattice matching and valence electron criterion between diverse nanoparticles and steel are summarized, and the existing various preparation methods are compared and analyzed. At present, there are four main methods to introduce nanoparticles into steel: external nanoparticle method, internal nanoparticle method, in-situ reaction method, and additive manufacturing method. These four methods have their own advantages and limitations, respectively. In this review, the synthesis, selection principle and strengthening mechanism of nanoparticles in cast steels for the above four methods are discussed in detail. Moreover, the main preparation methods and microstructure manipulation mechanism of the steel reinforced with different nanoparticles have been systematically expatiated. Finally, the development and future potential research directions of the application of nanoparticles in cast steel are prospected.

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“…These alloys typically contain 12-16 wt.% Cr (usually 14% Cr) and are reinforced with ~0.3 wt.% of Y2O3, which ensures superior mechanical properties. Nowadays, ODS RAF steels are characterised by good tensile and creep strength, especially at elevated temperatures, and also with great oxidation and neutron irradiation resistance [11]. In the early stage of the ODS steel development, these materials contained simply pure Y2O3 oxide in the form of unfavourable, largesized precipitates with a simple crystal structure [12].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Small Punch Tests of the 14Cr ODS Ferritic Steel

Nowik

Oksiuta

2022

Acta Mechanica Et Automatica

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Nowadays, various small specimen test techniques have gained wide popularity and appreciation among researchers as they offer undoubtful benefits in terms of structural material characterisation. This paper focuses on small punch tests (SPTs) performed on small-sized disc specimens to assess the mechanical properties of 14Cr oxide dispersion strengthened (ODS) steel. A numerical model was established to support experimental data and gain deeper insight into complex strain states developing in a deformed specimen. Modern evaluation procedures were discussed for obtaining mechanical properties from the small punch force-deflection response and were compared with the literature. Applicability and universality of those relations at different test conditions were also studied. It appeared that different ball diameters used had negligible influence on yield point but strongly affected ultimate strength estimation. It was found that friction belongs to decisive factors determining strain distribution in samples, as dry conditions increase the peak strain and move its location farther from the punch pole.

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Tailoring the secondary phases and mechanical properties of ODS steel by heat treatment

Cited by 36 publications

References 61 publications

Nano-oxide precipitation kinetics during the consolidation process of a ferritic oxide dispersion strengthened steel.

Nano-oxide precipitation kinetics during the consolidation process of a ferritic oxide dispersion strengthened steel.

Application of nanoparticles in cast steel: An overview

Experimental and Numerical Small Punch Tests of the 14Cr ODS Ferritic Steel

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