Abstract
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.
Highlights
Oxide dispersion-strengthened (ODS) alloys containing homogeneously dispersed yttrium nanoparticles allows for the operation limit of structural materials to be increased to very high temperatures of up to 1300 ◦ C
The individual levels of total strain amplitude were stepwise increased from 0.1% to approximately 500 grains using the linear interception method was 129 μm
Theofconclusions can be summarized as follows:oxide dispersion strengthened (ODS) alloy at 800 °C was performed for the first time
Summary
Oxide dispersion-strengthened (ODS) alloys containing homogeneously dispersed yttrium nanoparticles allows for the operation limit of structural materials to be increased to very high temperatures of up to 1300 ◦ C. The thermally very stable nano-oxides act as obstacles to the movement of dislocations in the matrix and contribute to the strengthening within a very wide range of temperatures. In the case of classical ODS alloys, usually, a small amount (about 0.3 wt.%) of homogeneously dispersed yttrium nano-sized particles is used [1,2]. Strategies based on the addition of complex oxides (Y, Hf, Zr, Ce, La) for the enhancement of strengthening ODS EUROFER steel can be found in the literature (see [3] and references therein). The mechanism of strengthening by yttrium nano-oxides has been investigated for other complex materials. Hadraba et al [4]
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