Microstructural anisotropy of ferritic ODS alloys after different production routes

Hoffmann, J.; Rieth, M.; Commin, L.

doi:10.1016/j.fusengdes.2015.05.002

Cited by 14 publications

(6 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…• ODS-HR is a 13%Cr ODS steel hot rolled plate provided by Karlsruhe Institute of Technology, Germany (KIT). The main production steps include: mechanical alloying in an attritor ball mill, encapsulation of the powder, hot isostatic pressing at 1100 °C and 100 MPa and rolling at 1100 °C from a diameter of 80 mm to a plate of 8 mm thickness in 5 runs [9,22]. • ODS-HE-1 is a hot extruded 13% Cr ODS steel round bar also provided KIT.…”

Section: Methodsmentioning

confidence: 99%

“…• ODS-HE-1 is a hot extruded 13% Cr ODS steel round bar also provided KIT. The main fabrication steps include: mechanical alloying in an attritor ball mill, encapsulation of the powder, evacuation of the capsule and hot extrusion at 1100 °C [10,22]. • ODS-HE-2 is a hot extruded 14% Cr ODS steel round bar provided by Centro Sviluppo Materiali, Italy (CSM).…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Effect of anisotropic microstructure of ODS steels on small punch test results

Altstadt

Houška

Das

2018

Ubiquity Proceedings

View full text Add to dashboard Cite

How to cite:Altstadt, E., Houska, M. & Das, A. 2018. Effect of anisotropic microstructure of ODS steels on small punch test results. Ubiquity Proceedings, 1(S1): 4Abstract: Oxide dispersed strengthened (ODS) steels can exhibit a strongly anisotropic microstructure leading to anisotropic mechanical properties. The ductile to brittle transition temperature in the small punch (SP) test is therefore dependent on the specimen orientation. Three ODS steels with 13-14 mass percent Cr, manufactured through hot extrusion and hot rolling respectively, were investigated by means of SPT in different orientations. Existing microstructural data (EBSD) are used to discuss the anisotropic fracture behavior observed in the SPT. In addition, the SPT results are compared with those from existing fracture mechanics tests based on sub-sized C(T) samples. The applicability of the empirical conversion of SPT based transition temperatures into Charpy transition temperatureswell established for isotropic homogeneous metalsis investigated for materials with anisotropic microstructure.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Effect of anisotropic microstructure of ODS steels on small punch test results

Altstadt

Houška

Das

2018

Ubiquity Proceedings

View full text Add to dashboard Cite

show abstract

“…The main manufacturing steps for the hot-extruded rod were the following: mechanical alloying of the steel alloy and 0.3% Y 2 O 3 powder in an attritor ball mill, encapsulation of the powder, evacuation of the capsule and hot-extrusion at 1100 • C. The reduction of 80 mm initial diameter to a 12 mm final diameter rod resulted in an extrusion ratio of 44.4. Details of the production method for both the materials can be found in reference [25].…”

Section: Methodsmentioning

confidence: 99%

“…The reduction of 80 mm initial diameter to a 12 mm final diameter rod resulted in an extrusion ratio of 44.4. Details of the production method for both the materials can be found in reference [25].…”

Section: Methodsmentioning

confidence: 99%

Why Do Secondary Cracks Preferentially Form in Hot-Rolled ODS Steels in Comparison with Hot-Extruded ODS Steels?

et al. 2018

Self Cite

View full text Add to dashboard Cite

Secondary cracks are known to absorb energy, retard primary crack propagation and initiate at lower loads than primary cracks. They are observed more often in hot-rolled than in hot-extruded ODS steels. In this work, the microstructural factors responsible for this observation are investigated. Better understanding of these factors can lead to tailoring of improved ODS steels. Fracture toughness testing of two batches of 13Cr ODS steel, one hot-rolled and the other hot-extruded, was carried out. The fracture behaviour of secondary cracks was investigated using scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). Crystallographic texture and grain morphology play a predominant role in preventing secondary cracks in hot-extruded ODS steels. At lower temperatures, secondary cracks occur predominantly via transgranular cleavage. The fracture mode changes to ductile and intergranular at higher temperatures.

show abstract

“…ODF maps describe the lamination and recrystallization texture for steels in terms of the fiber orientations in the Euler space (Figure 9). Principal bcc steel fibers are α and γ: α fibers are oriented from {001} <110> to {111} <110> along <110>//(L, T), and γ fibers are oriented from {111} <110> to {111} <112> along <111>//S [21,22]. As described in Figure 9, TS plane on the ODS-L steel after HCR presents the common fibers for bcc-laminated steels with a strong <110>//T texture, which corresponds to the α fiber with its maximum intensity at {001} <110> and secondary components close to {111} <110> and {111} <011> related to the γ fiber (previously reported on similar steels [20,22]).…”

Section: Grain Microstructurementioning

confidence: 99%

Powder Particle Size Effects on Microstructure and Mechanical Properties of Mechanically Alloyed ODS Ferritic Steels

Oñoro

Macías-Delgado

Auger

et al. 2021

Metals

Self Cite

View full text Add to dashboard Cite

Reduced activation ferritic (RAF) steels are expected to be widely used in challenging nuclear industrial applications under severe thermo-mechanical regimes and intense neutron loads. Therefore, actual research panorama is facing the strengthening strategies necessary to maximize both performance and endurance under these conditions. Oxide dispersion strengthened (ODS) RAF steels are leader candidates as structural materials in fusion energy reactors thanks to the reinforcement obtained with a fine dispersion of nanosized oxides in their matrix. In this study, the influence of the initial powder particle size and the selected processing route on the final material has been investigated. Two RAF ODS steels coming from atomized pre-alloyed powders with nominal particle powder sizes of 70 and 30 µm and composition Fe-14Cr-2W-0.4Ti-0.3Y2O3 (wt. %) were manufactured by mechanical alloying. Alloyed powders were compacted by hot isostatic pressing, hot crossed rolled, and annealed at 1273 K. Initial powder particle size differences minimize after milling. Both steels present an almost completely recrystallized material and similar grain sizes. The same type and distributions of secondary phases, Cr-W-rich, Ti-rich, and Y-Ti oxide nanoparticles, have been also characterized by transmission electron microscopy (TEM) in both alloy samples. The strengthening effect has been confirmed by tensile and Charpy impact tests. The two alloys present similar strength values with slightly better ductile brittle transition temperature (DBTT) and ductility for the steel produced with the smaller powder size.

show abstract

Microstructural anisotropy of ferritic ODS alloys after different production routes

Cited by 14 publications

References 8 publications

Effect of anisotropic microstructure of ODS steels on small punch test results

Effect of anisotropic microstructure of ODS steels on small punch test results

Why Do Secondary Cracks Preferentially Form in Hot-Rolled ODS Steels in Comparison with Hot-Extruded ODS Steels?

Powder Particle Size Effects on Microstructure and Mechanical Properties of Mechanically Alloyed ODS Ferritic Steels

Contact Info

Product

Resources

About