scholarly journals High Temperature Cyclic Plastic Response of New-Generation ODS Alloy

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 804
Author(s):  
Alice Chlupová ◽  
Ivo Šulák ◽  
Jiří Svoboda
Keyword(s):  
High Temperature ◽  
Oxide Dispersion Strengthened ◽  
Step Test ◽  
Coarse Grained ◽  
Fatigue Properties ◽  
Oxide Dispersion ◽  
Ods Alloys ◽  
New Generation ◽  
Near Future ◽  
Ods Alloy

The very recently developed coarse-grained new-generation oxide dispersion strengthened (ODS) alloys containing 5 vol.% homogeneously distributed yttrium nano-precipitates seems to be a promising oxidation-resistant structural material for applications at temperatures above 1000 °C. The primary aim of the present paper is the introduction of the new-generation oxide dispersion strengthened (ODS) alloy and the first testing of its high temperature fatigue properties at 800 °C, concurrently demonstrating a novel and very efficient methodology by using an incremental fatigue step test. The successful application of the methodology motivates the authors to test the fatigue properties of new generation ODS alloys at 1000–1200 °C in the near future.

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

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5070 ◽  
Author(s):  
Jiří Svoboda ◽  
Natália Luptáková ◽  
Milan Jarý ◽  
Petr Dymáček
Keyword(s):  
Hot Rolling ◽  
Secondary Recrystallization ◽  
Oxide Dispersion Strengthened ◽  
Coarse Grained ◽  
Mechanically Alloyed ◽  
Creep Properties ◽  
Ods Alloys ◽  
Rolling Temperatures ◽  
New Generation ◽  
Ods Alloy

The coarse-grained new-generation Fe-Al-Y2O3-based oxide dispersion strengthened (ODS) alloys contain 5 vol.% homogeneously dispersed yttria nano-precipitates and exhibit very promising creep and oxidation resistance above 1000 °C. The alloy is prepared by the consolidation of mechanically alloyed powders via hot rolling followed by secondary recrystallization. The paper presents a systematic study of influence of rolling temperature on final microstructure and creep at 1100 °C for two grades (Fe-10Al-4Y2O3 and Fe-9Al-14Cr-4Y2O3 in wt%) of new-generation ODS alloys. The hot rolling temperatures exhibit a rather wide processing window and the influence of Cr-alloying on creep properties is evaluated as only slightly positive.

Microstructure of Surface Oxide Films on a Commercial Ods Alloy

1982 ◽  
Vol 40 ◽  
pp. 532-533
Author(s):  
T. A. Ramanarayanan ◽  
M. Raghavan ◽  
R. Petkovic-Luton
Keyword(s):  
Microstructural Analysis ◽  
Microscopic Analysis ◽  
Oxide Dispersion Strengthened ◽  
Oxide Dispersion ◽  
Oxide Interface ◽  
Electron Microscopic ◽  
Temperature Oxidation ◽  
Oxide Adherence ◽  
Ods Alloys ◽  
Ods Alloy

It is well known that the presence of yttria dispersoids in aluminum containing Oxide Dispersion Strengthened (ODS) alloys significantly improve the adherence of the protective AI2O3 oxide scale during high temperature oxidation. However, the exact mechanism by which this improved adherence is brought about is not well understood. As a part of an investigation to study the mechanism of oxide adherence in a ODS alloy MA956, electron microscopic analysis of the oxide and metal/oxide interface was conducted and the results of the microstructural analysis are described here.

Influence of Plastic Deformation on Recrystallized Microstructure of Fe-Base ODS Alloy

2010 ◽  
Vol 638-642 ◽  
pp. 2209-2214
Author(s):  
Carlos Capdevila ◽  
I. Toda ◽  
J. Chao ◽  
Carlos García de Andrés
Keyword(s):  
Plastic Deformation ◽  
Plastic Strain ◽  
Mechanical Alloying ◽  
Recent Work ◽  
Oxide Dispersion Strengthened ◽  
Coarse Grained ◽  
Oxide Dispersion ◽  
Large Influence ◽  
Ods Alloy ◽  
Number Of Authors

The ferritic oxide dispersion strengthened alloys (ODS) are manufactured using the mechanical alloying process. The development of a coarse grained microstructure during the recrystallization has been noted and discussed by a number of authors but, the mechanism of grain control remains uncertain. Recent work has emphasized the large influence of non-uniformities on the development of the recrystallized microstructure. The purpose of the present work was to study the effect of non-uniform plastic strain on recrystallization of Fe-base ODS alloy named MA 957.

scholarly journals Effect of Extensive and Limited Plastic Deformation on Recrystallized Microstructure of Oxide Dispersion Strengthened Fe-Cr-Al Alloy

Metals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1052
Author(s):  
Carlos Capdevila ◽  
Rosalia Rementeria ◽  
Maria Aranda ◽  
Javier Vivas ◽  
Jesus Chao ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Mechanical Alloying ◽  
Recent Work ◽  
Grain Growth ◽  
Oxide Dispersion Strengthened ◽  
Coarse Grained ◽  
Al Alloy ◽  
Oxide Dispersion ◽  
Plastic Strains ◽  
Ods Alloy

Ferritic oxide dispersion-strengthened alloys (ODS) are manufactured using a mechanical alloying process. The development of a coarse-grained microstructure during recrystallization has been detected and discussed by several authors, but the mechanism of grain growth remains uncertain. Recent work has emphasized the large influence of non-uniformities on the development of the recrystallized microstructure. The purpose of the present work is to study the effect of both slight heterogeneous plastic strains and strong directional deformation on recrystallization of a ferritic Fe-base ODS alloy.

scholarly journals Fundamental Improvement of Creep Resistance of New-Generation Nano-Oxide Strengthened Alloys via Hot Rotary Swaging Consolidation

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5217
Author(s):  
Jiří Svoboda ◽  
Lenka Kunčická ◽  
Natália Luptáková ◽  
Adam Weiser ◽  
Petr Dymáček
Keyword(s):  
Volume Fraction ◽  
Secondary Recrystallization ◽  
Grain Morphology ◽  
Oxide Dispersion Strengthened ◽  
High Volume ◽  
Coarse Grained ◽  
Mechanically Alloyed ◽  
Rotary Swaging ◽  
New Generation ◽  
Ods Alloy

New-generation oxide dispersion-strengthened (ODS) alloys with a high volume fraction of nano-oxides of 5% are intended to become the leading creep- and oxidation-resistant alloys for applications at 1100–1300 °C. Hot consolidation of mechanically alloyed powders by intensive plastic deformation followed by heat treatment of the alloys are the key aspects for achieving top creep properties, typically ensured by a coarse-grained microstructure strengthened with homogeneously dispersed, very stable yttrium nano-oxides. The rotary swaging method proves to be favourable for hot consolidation of the new-generation ODS alloy presented. Compared to specimens consolidated by hot rolling, consolidation by hot rotary swaging predetermines the formation of coarse grains with a very high aspect ratio during subsequent secondary recrystallization. Such a grain morphology increases the creep strength of the new-generation ODS alloy considerably.

scholarly journals High temperature fatigue properties of Oxide-Dispersion-Strengthened platinum-10% rhodium alloy

2019 ◽  
Vol 19 ◽  
pp. 106-112
Author(s):  
Akifumi Niwa ◽  
Yukihito Akita ◽  
Kandai Enomoto ◽  
Rintaro Aoyama ◽  
Hiroyuki Akebono ◽  
...  
Keyword(s):  
High Temperature ◽  
Oxide Dispersion Strengthened ◽  
Fatigue Properties ◽  
Oxide Dispersion ◽  
High Temperature Fatigue
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