High yttria ferritic ODS steels through powder forging

Kumar, Deepak; Prakash, U.; Dabhade, Vikram V.; Laha, K.; Sakthivel, T.

doi:10.1016/j.jnucmat.2016.12.043

Cited by 31 publications

(13 citation statements)

References 36 publications

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“…Fe-Al-based OPH steel is prepared based on a controlled mechanical alloying process, which is highly dependent on the powder metallurgy 23 (Figure 1). In the first stage, powders consisting of 90 w/% of Fe and 10 w/% of Al are mixed with a specific amount of O 2 in the form of gas in our own low-energy ball mill capable of evacuation and filling with oxygen.…”

Section: Materials Preparationmentioning

confidence: 99%

Improving the high-temperature properties of a new generation of Fe-Al-O oxide-precipitation-hardened steels

Khalaj¹,

Jirková²,

Janda³

et al. 2019

Mater. Tehnol.

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Increasing efficiency in power engineering is conditional on the improvement of the high-temperature properties of structural materials. A new Fe-Al-O Oxide-Precipitation-Hardened (OPH) steel was developed by the authors to dissolve the required amount of O in the matrix during mechanical alloying and let a fine dispersion of Al oxides precipitate during the hot consolidation. Compared to oxide-dispersion-strengthened (ODS) ferritic steels, excellent oxidation resistance is guaranteed by using 10 % Al in the matrix. To improve the high-temperature properties of OPH, a series of thermomechanical tests was performed to investigate the recrystallization and grain growth of the microstructures by metallographic analysis. The results show that the heat treatment has a significant influence on the mechanical properties of OPH as well as the microstructure and recrystallization of the grains. It decreased the UTS to almost 25 % of the initial state, while causing plastic deformation. Also, grain growth was observed up to 16 %, even with no annealing and applied deformation, which shows a good structure-oriented material.

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Section: Materials Preparationmentioning

confidence: 99%

Improving the high-temperature properties of a new generation of Fe-Al-O oxide-precipitation-hardened steels

Khalaj¹,

Jirková²,

Janda³

et al. 2019

Mater. Tehnol.

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“…The method for producing Fe-Al based ODS alloys with fine Al 2 O 3 precipitates is highly dependent on powder metallurgy (Figure 1). 20 In the first step, the powders consisting of Fe-11 % mass fraction of the Al matrix (90 % mass fraction of Fe and 10 % mass fraction of Al) are mixed with 1 % mass fraction of O 2 in gas, which is absorbed, in a low-energy ball mill developed by the authors, allowing evacuation and filling by oxygen. It is equipped with two steel containers (each 24 L), filled with 160 (80 in each) steel balls with a diameter of 40 mm.…”

Section: Materials Preparationmentioning

confidence: 99%

“…Type 1 was used to investigate homogeneous temperature fields, and type 2 for the simplicity of the tests. Specimen type 2 was designed to have 4 different deformations (5,8,20 and 50) % at the same time. The shortest part (9 mm) was equal to 0 % deformation during the pressing and the other parts had appropriate values of deformation.…”

Section: Materials Preparationmentioning

confidence: 99%

“…The tests for group B were performed to investigate the effects of the holding time at 1200°C and the deformation percentage for both materials on the recrystallization and grain coarsening of the type-2 specimens (Figure 3b). As mentioned above, four different types of deformation (5,8,20 and 50) % were applied as part of treatment no. 2 (Figure 5).…”

Section: Testing Programmementioning

confidence: 99%

“…On the other hand, at higher temperatures, the recovery and damage induced by the creep lead to a decrease in the ductility. [21][22] Figure 7 shows the hardness (HV10) test results for both materials without deformation and after the applications of (5,8,20 and 50) % deformation, and at different annealing times of (0, 10, 20 and 40) h at 1200°C. A Vickers hardness test was performed using a ZWICK/ It can be seen that with the increasing deformation, there is almost no change in the hardness of either material for any of the holding times.…”

Section: Test Group Amentioning

confidence: 99%

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Using thermomechanical treatments to improve the grain growth of new-generation ODS alloys

Khalaj¹,

Jirková²,

Mašek³

et al. 2018

Mater. Tehnol.

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In order to achieve specific mechanical properties and structures of a material, a combination of new technologies together with an unconventional use of different types of materials could be an asset. Powder metallurgy, involving a metal matrix and dispersed stable particles, in combination with mechanical alloying and hot consolidation could be a solution. This paper describes the thermomechanical characteristics of new oxide-dispersion-strengthened (ODS) alloys with a Fe-Al matrix in terms of changes in the grain-size distribution. Recrystallization and grain growth were investigated over a range of temperatures and deformations. The results show that the grain-growing process in the new ODS alloys is significantly affected by the thermomechanical treatment, leading to the maximum grain size within 20-h annealing at 1200°C. They are analysed using different methods, including optical microscopy.Da bi lahko izdelali materiale s specifi~nimi mehanskimi lastnostmi in strukturo, moramo izbirati kombinacijo ve~razli~nih novih tehnologij skupaj z nekonvencionalno uporabo razli~nih vrst materialov. Kot re{itev se ponuja tehnologija metalurgije prahov, s katero lahko ustvarimo me{anico kovinskih prahov in stabilnih oksidnih delcev. Tej sledi kombinacija mehanskega legiranja in vro~e konsolidacije. V~lanku avtorji opisujejo termomehanske lastnosti nove z oksidi disperzijsko utrjene (ODS; angl: Oxide Dispersion Strengthened) zlitine s Fe-Al matrico s poudarkom na spremembah porazdelitve velikosti kristalnih zrn. Avtorji so raziskovali rekristalizacijo in rast zrn v {irokem obmo~ju temperatur in deformacij. Rezultati raziskave so pokazali, da je proces rasti zrn novih ODS zlitin pomembno odvisen od termomehanske obdelave, ki vodi do maksimalne velikosti zrn po 20 urnem`arjenju na 1200°C. Avtorji so za analize uporabili razli~ne metode, vklju~no z opti~no mikroskopijo. Klju~ne besede: rast zrn, z oksidi disperzijsko utrjene zlitine (ODS), jeklo, Fe-Al, Al2O3Materiali in tehnologije / Materials and technology 52 (2018) 4, 475-482 475

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Grain Coarsening Kinetics and Strength Modeling of Fe–15Cr–2W Oxide Dispersion Strengthened Steels with Varying Yttria Contents

Verma,

Dabhade

2024

Powder Metall Met Ceram

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High yttria ferritic ODS steels through powder forging

Cited by 31 publications

References 36 publications

Improving the high-temperature properties of a new generation of Fe-Al-O oxide-precipitation-hardened steels

Improving the high-temperature properties of a new generation of Fe-Al-O oxide-precipitation-hardened steels

Using thermomechanical treatments to improve the grain growth of new-generation ODS alloys

Grain Coarsening Kinetics and Strength Modeling of Fe–15Cr–2W Oxide Dispersion Strengthened Steels with Varying Yttria Contents

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