Perspective of ODS alloys application in nuclear environments

Ukai, Shigeharu; Fujiwara, Masayuki

doi:10.1016/s0022-3115(02)01043-7

Cited by 714 publications

(318 citation statements)

References 19 publications

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“…In this study, the transformable martensitic base 12CrODS steels are designed to lead to better processing formability by the α/γ transformation. For transformable 9CrODS steels, it is known that their structure is a dual phase composed of tempered martensite and ferrite [4][5][6], although the full-tempered martensite is predicted in the equilibrium phase diagram. This ferrite is designated as a metastable residual ferrite, and it is also known that the residual ferrite significantly improves the high-temperature strength in 9CrODS steels [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Residual ferrite formation in 12CrODS steels

Ukai

Kudo

et al. 2014

Journal of Nuclear Materials

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Increasing Cr content from 9 to 12 mass % leads to superior corrosion and high-temperature oxidation resistances, but usually changes microstructure from martensite to full-ferrite. Alloy design was conducted for 12CrODS steels to modify their structure to the martensite-base matrix, since the transformable martensititic ODS steels have superior processing capability by using α/γ phase transformation. The two types of ferrite are included; the equilibrium ferrite is predictable from the equilibrium phase diagram. Formation of the metastable residual ferrite was assessed through pinning of α/γ interfacial boundaries by oxide particles as well as chemical driving force for the α to γ transformation.

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Section: Introductionmentioning

confidence: 99%

Residual ferrite formation in 12CrODS steels

Ukai

Kudo

et al. 2014

Journal of Nuclear Materials

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“…Oxides with a particle size of less than 10nm are found on the base in a coherent state, and by lowering the misfit strain, they can maintain a stable state at high temperatures. It is also known to be able to increase helium embrittlement and void swelling resistance against neutron radiation [3]. However, as MA is the most critical process in manufacturing ODS steel, it is difficult to optimize the process, and there are various studies being conducted.…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on the Microstructure and Tensile Deformation Behavior of Oxide Dispersion Strengthened Alloys Manufactured by Complex Milling Process

Kim¹,

Kim²,

Gwon³

et al. 2017

Archives of Metallurgy and Materials

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This study attempted to manufacture an ODS alloy by combining multiple milling processes in mechanical alloying stage to achieve high strength and fracture elongation. The complex milling process of this study conducted planetary ball milling, cryogenic ball milling and drum ball milling in sequential order, and then the microstructure and tensile deformation behavior were investigated after additional heat treatment. The oxide particles distributed within the microstructure were fine oxide particles of 5~20 nm and coarse oxide particles of 100~200 nm, and the oxide particles were confirmed to be composed of Cr, Ti, Y and O. Results of tensile tests at room temperature measured yield strength, tensile strength and elongation as 1320 MPa, 2245 MPa and 4.2%, respectively, before heat treatment, and 1161 MPa, 2020 MPa and 5.5% after heat treatment. This results indicate that the ODS alloy of this study gained very high strengths compared to other known ODS alloys, allowing greater plastic zones.

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“…Oxide nanoparticles also provide a high density of sinks for irradiation induced point defects and He. This would reduce irradiation hardening and restrain the formation of He bubbles at grain boundaries, preventing embrittlement [6,7].…”

Section: Introductionmentioning

confidence: 99%

Tensile and fracture characteristics of oxide dispersion strengthened Fe–12Cr produced by hot isostatic pressing

Castro

Garces-Usan

Pareja

2013

Journal of Nuclear Materials

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Abstract:The mechanical characteristics of a model oxide dispersion strengthened (ODS) alloy with nominal com-position Fe-12 wt%Cr-0.4 wt%Y 2 O 3 were investigated by means of microhardness measurements, tensile tests up to fracture in the temperature range of 298-973 K, and fracture surface analyses. A non-ODS Fe-12 wt%Cr alloy was also studied to assess the real capacity of the oxide dispersion for strengthening the alloy. The materials were produced by mechanical alloying followed by hot isostatic pressing consolida-tion and heat treatment at 1023 K. The strengthening effect of the oxide nanodispersion was effective at all temperatures studied, although the tensile strength converges towards the one obtained for the ref-erence alloy at higher temperatures. Moreover, the ODS alloys failed prematurely at T < 673 K due to the presence of Y-rich inclusions, as seen in the fracture surface of these alloys.

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Perspective of ODS alloys application in nuclear environments

Cited by 714 publications

References 19 publications

Residual ferrite formation in 12CrODS steels

Residual ferrite formation in 12CrODS steels

Effect of Heat Treatment on the Microstructure and Tensile Deformation Behavior of Oxide Dispersion Strengthened Alloys Manufactured by Complex Milling Process

Tensile and fracture characteristics of oxide dispersion strengthened Fe–12Cr produced by hot isostatic pressing

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