Influence of Hot Consolidation Conditions and Cr-Alloying on Microstructure and Creep in New-Generation ODS Alloy at 1100 °C

Svoboda, Jiřı́; Luptáková, Natália; Jarý, Milan; Dymáček, Petr

doi:10.3390/ma13225070

Cited by 10 publications

(10 citation statements)

References 29 publications

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“…On the other hand, such a high value of UTS may be caused by the high density of oxides in the OPH alloy. The influence of excess oxygen on the tensile strength is also confirmed by a previous research [24,26,27,29,30], which stated that the highest UTS is almost achieved for a low content of 0.12% oxygen, while a higher excess oxygen made the tensile properties in a different way.…”

Section: Mechanical Propertiessupporting

confidence: 80%

Hot Rolling vs. Forging: Newly Developed Fe-Al-O Based OPH Alloy

Khalaj

Jirková

Burdová

et al. 2021

Metals

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Two oxide precipitation hardened (OPH) Fe-Al-O-based steels were prepared by mechanical alloying. In addition to the variant using yttria nano-precipitates to improve the mechanical properties, a variant using only alumina precipitates for strengthening was also prepared. Therefore, a more economically acceptable variant of these steels was developed. Hot consolidation is a significant production step for achieving the required mechanical properties. Hot consolidation was performed by either hot rolling or forging. The heat treatment was subsequently performed on both variants (0.85Fe–0.11Al–0.03Y2O3–0.01Y and 0.87Fe–0.11Al–0.02O2) of the alloys to support secondary recrystallization. The paper describes the influence of the consolidation method on grain size, material recrystallization, and mechanical properties. The difference in the consolidation method was reflected in the grain size after the heat treatment, where the material consolidated by hot rolling reached a grain size of almost 200 μm, while after forging the maximum grain size was around 30 μm. A higher ultimate tensile strength was achieved with forged states, both with and without the heat treatment.

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Section: Mechanical Propertiessupporting

confidence: 80%

Hot Rolling vs. Forging: Newly Developed Fe-Al-O Based OPH Alloy

Khalaj

Jirková

Burdová

et al. 2021

Metals

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“…This can be attributed to a few differences in composition during the production process. During mechanical alloying, 5-10% of the material of the milling balls are ground from the balls and contaminate the powder [30]. As the C content in the ball bearings reaches approximately 1%, the mechanically alloyed powder is contaminated by 0.05-0.1% of C, which leads to the formation of Cr-and Mo-rich, stable carbides precipitating after static recrystallization at the grain boundaries.…”

Section: Resultsmentioning

confidence: 99%

“…The new Fe-Cr-Al-based OPH steel was prepared by metal powders using powder metallurgy [19]. The difference compared to other ODS steels is the use of a higher content of yttrium nano-oxides and aluminum [27][28][29][30]. In the first step, powders of Fe, Al, Y 2 O 3, and other components (Table 1) are mechanically alloyed in a vacuum in a low-energy ball mill developed by the authors.…”

Section: Materials Preparationmentioning

confidence: 99%

The Effect of Heat Treatment on the Tribological Properties and Room Temperature Corrosion Behavior of Fe–Cr–Al-Based OPH Alloy

et al. 2020

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The microstructure, mechanical, tribological, and corrosion properties of Fe–Cr–Al–Y-based oxide-precipitation-hardened (OPH) alloy at room temperature are presented. Two OPH alloys with a composition of 0.72Fe–0.15Cr–0.06Al–0.03Mo–0.01Ta–0.02Y2O3 and 0.03Y2O3 (wt.%) were prepared by mechanical alloying with different milling times. After consolidation by hot rolling, the alloys presented a very fine microstructure with a grain size of approximately 180 nm. Such a structure is relatively brittle, and its mechanical properties are enhanced by heat treatment. Annealing was performed at three temperatures (1000 °C, 1100 °C, and 1200 °C), with a holding time from 1 to 20 h. Tensile testing, wear testing, and corrosion testing were performed to evaluate the effect of heat treatment on the behavior and microstructural properties. The grain size increased almost 10 times by heat treatment, which influenced the mechanical properties. The ultimate tensile strength increased up to 300% more compared to the initial state. On the other hand, heat treatment has a negative effect on corrosion and wear resistance.

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“…Our team strives for several years to develop an alloy with the best possible resistance to oxidation and creep at temperatures of 1100-1300 • C). This has led to an increase in the Al content in the new grade [15][16][17][18] Fe-Al-Cr-based ODS alloy to 10 wt. % and the volume fraction of pure Y 2 O 3 to 5%.…”

Section: Introductionmentioning

confidence: 99%

Coarsening Kinetics of Y2O3 Dispersoid in New Grade of Fe-Al-Cr-Based ODS Alloy

Holzer

Gamanov

Luptáková

et al. 2022

Metals

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Oxide dispersion strengthened (ODS) alloys with a high content of Al are candidate materials for extreme high temperature applications such as turbine blades and other components working at temperatures significantly above 1000 °C. While oxidation kinetics of Fe–Al ODS steels is frequently studied, the stability and growth kinetics of strengthening oxide dispersion is a rarely studied topic. The Fe-10Al-4Cr-4Y2O3 is an experimental material, fabricated at IPM by powder metallurgy route and contains much higher volume fraction of Y2O3 than similar materials. Stability and growth kinetics of Y2O3 particles of our material are studied on 24 samples aged for 0.5, 1, 2, 4, 8, 16, 32 and 72 h at 1200 °C, 1300 °C and 1400 °C. The sizes of at least 600 individual Y2O3 particles are measured on each sample to obtain extensive statistical analysis of the particle growth. The average particle size coarsens from 28.6 ± 0.7 nm to 36.9 ± 0.9 nm in 1200 °C series and to 81.4 ± 5.6 nm in 1400 °C series. The evaluated activation energy of coarsening of Y2O3 particles is 274 ± 65 kJ. The effects of particle coarsening on mechanical properties is demonstrated by HV measurements, which is in very good agreement with the Orowan theory.

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Influence of Hot Consolidation Conditions and Cr-Alloying on Microstructure and Creep in New-Generation ODS Alloy at 1100 °C

Cited by 10 publications

References 29 publications

Hot Rolling vs. Forging: Newly Developed Fe-Al-O Based OPH Alloy

Hot Rolling vs. Forging: Newly Developed Fe-Al-O Based OPH Alloy

The Effect of Heat Treatment on the Tribological Properties and Room Temperature Corrosion Behavior of Fe–Cr–Al-Based OPH Alloy

Coarsening Kinetics of Y2O3 Dispersoid in New Grade of Fe-Al-Cr-Based ODS Alloy

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