Reduced activation ODS ferritic steel – recent development in high speed hot extrusion processing

Oksiuta, Z.; Lewandowska, M.; Kurzydłowski, Krzysztof J.; Baluc, N.

doi:10.1002/pssa.200983365

Cited by 13 publications

(8 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Finally, severe plastic deformation (SPD) processes such as equal channel angular extrusion (ECAE) or pressing (ECAP) and high-speed hot extrusion (HSHE) have also applied to ODS steels. [12,47,48] Both HSHE and ECAE of the as-HIPed material were shown to give rise to a significant microstructure refinement and extra hardening. [47,48] However, SPD applied to PM ODS steels may not offer a major step forward from an economic point of view.…”

Section: B Recent Progress In Powder Processing Of Ods Alloysmentioning

confidence: 97%

Alternative Fabrication Routes toward Oxide-Dispersion-Strengthened Steels and Model Alloys

Bergner

Hilger

Virta

et al. 2016

Metall Mater Trans A

View full text Add to dashboard Cite

The standard powder metallurgy (PM) route for the fabrication of oxide-dispersion-strengthened (ODS) steels involves gas atomization to produce a prealloyed powder, mechanical alloying (MA) with fine oxide powders, consolidation, and finally thermal/thermomechanical treatment (TMT). It is well established that ODS steels with superior property combinations, for example, creep and tensile strength, can be produced by this PM/MA route. However, the fabrication process is complex and expensive, and the fitness for scaling up to the industrial scale is limited. At the laboratory scale, production of small amounts of well-controlled model systems continues to be desirable for specific purposes, such as modeling-oriented experiments. Thus, from the laboratory to industrial application, there is growing interest in complementary or alternative fabrication routes for ODS steels and related model systems, which offer a different balance of cost, convenience, properties, and scalability

show abstract

Section: B Recent Progress In Powder Processing Of Ods Alloysmentioning

confidence: 97%

Alternative Fabrication Routes toward Oxide-Dispersion-Strengthened Steels and Model Alloys

Bergner

Hilger

Virta

et al. 2016

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

“…Such a processing results in reduced grain size and residual porosity, bringing about improved strength and impact properties [10]. Extruded samples were annealed at temperature ranging from 650 up to 1350°C, for 1 h in argon atmosphere.…”

Section: Methodsmentioning

confidence: 99%

Microstructural changes upon annealing in ODS-strengthened ultrafine grained ferritic steel

et al. 2013

Self Cite

View full text Add to dashboard Cite

In this study, the stability of grain size and oxide nanoparticles in the ODS steel upon annealing at high temperature (650-1350°C) has been evaluated. The ODS Fe-Cr-W-Ti-Y 2 O 3 steel has been manufactured by powder metallurgy, consolidated by hot isostatic pressing and processed by hydrostatic extrusion. Such a processing brings about ultrafine grain structure reinforced with oxide nanoparticles (few nm in diameter) and results in superior mechanical properties. The stability of nano-oxides has been analyzed by small angle X-ray scattering together with transmission electron microscopy. The results obtained revealed excellent thermal stability of ultrafine grained ODS ferritic steel, which was attributed to the resistance of oxides against coarsening.

show abstract

“…Several studies have reported that fine and thermo-stable oxides improve the creep resistance of ferritic steels [ 10 , 11 , 12 , 13 ] and trap He in fine bubbles, thereby limiting He movement and restraining He brittleness [ 2 , 3 , 4 ]. The common processes to fabricate ODS steels are powder metallurgy (PM) with mechanical alloying (MA) and heat consolidation [ 14 ], including hot isostatic pressure (HIP) [ 9 ], hot extrusion (HE) [ 15 , 16 ], and spark plasma sintering (SPS) [ 17 ], and ODS steels have a high density and an excellent tensile strength. In contrast to HIP and HE, laser additive manufacturing (LAM) [ 18 , 19 ] without the MA process is a method used to manufacture the ODS Fe-matrix alloys because of its low cost and flexibility [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Oxygen Content on Microstructure and Tensile Properties of a 22Cr-5Al ODS Steel

et al. 2021

View full text Add to dashboard Cite

The high tensile strength and irradiation resistance of oxide dispersion strengthened (ODS) ferritic steels is attributed to the ultrafine and dispersed oxides within the matrix. The high content of oxygen and yttrium is critical for the formation of dense Y-rich oxides. However, only few studies have reported the effect of oxygen content on the microstructure and mechanical properties of ODS steels. Herein, we employed gas atomization reactive synthesis to prepare pre-alloy powders and then hot isostatic pressing (HIP) to consolidate two 22Cr-5Al ODS steels with different oxygen content. Our results showed Y-rich precipitates at and near grain boundaries of the as-HIPed alloys. Moreover, with the oxygen content increasing from 0.04 to 0.16 wt%, more precipitates precipitated in the as-HIPed alloy, and the ultimate tensile strength of the alloy was improved. However, increasing the oxygen content to 0.16 wt% led to formation of stripe and chain precipitates at and near grain boundaries, which caused a partial intergranular fracture of the as-HIPed alloy.

show abstract

Reduced activation ODS ferritic steel – recent development in high speed hot extrusion processing

Cited by 13 publications

References 7 publications

Alternative Fabrication Routes toward Oxide-Dispersion-Strengthened Steels and Model Alloys

Alternative Fabrication Routes toward Oxide-Dispersion-Strengthened Steels and Model Alloys

Microstructural changes upon annealing in ODS-strengthened ultrafine grained ferritic steel

Effect of Oxygen Content on Microstructure and Tensile Properties of a 22Cr-5Al ODS Steel

Contact Info

Product

Resources

About