Analysis of cyclic plastic response of nickel based IN738LC superalloy

Petrenec, Martin; Polák, Jaroslav; Tobiáš, Jiří; Šmíd, Miroslav; Chlupová, Alice; Petráš, Roman

doi:10.1016/j.ijfatigue.2013.09.008

Cited by 12 publications

(21 citation statements)

References 17 publications

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“…Therefore, ODS steels can be considered as a two‐phase alloy consisting of (i) the ferritic or ferritic–martensitic matrix that may contain carbides and large non‐coherent oxide particles and (ii) a set of very fine coherent precipitates (nanoclusters) that could be intersected by dislocations. The situation is thus similar to the two‐phase systems of austenitic–ferritic stainless steel or nickel superalloys with γ matrix and γ′ precipitates …”

Section: Discussionmentioning

confidence: 81%

“…1). The method has been recently applied to two-phase material (nickel-based superalloy) 55 to find the effective saturated stresses and the respective probability density distributions of both phases. The application of this analysis to ODS steels can help in elucidation of the sources of the cyclic stress and of the origin of the changes of stress amplitude during cyclic straining.…”

Section: Sources Of Cyclic Stressmentioning

confidence: 99%

“…The situation is thus similar to the two-phase systems of austenitic-ferritic stainless steel 42 or nickel superalloys with γ matrix and γ′ precipitates. 55 We have therefore applied the analysis to the material that cyclically softens (ODS Eurofer steel) and to the material that is cyclically stable or even cyclically hardens (ODS CEA steel). The plot of the second derivative of the hysteresis half-loop (multiplied by À2/E eff 2 ) during cycling with the strain amplitude 7 × 10 À3 is shown in Fig.…”

Section: Application To Ods Steelsmentioning

confidence: 99%

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Microstructural stability of ODS steels in cyclic loading

Kuběna

Polák

Płociński

et al. 2015

Fatigue Fract Eng Mat Struct

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A B S T R A C T The remarkable microstructural stability of high chromium steels prepared by powder metallurgy and strengthened by dispersion of nanometric yttrium oxides in cyclic loading at high temperatures is reported. Contrary to the continuous cyclic softening and profound changes in the microstructure during fatigue of common high chromium steels, the addition of 0.3 wt% Y 2 O 3 stabilizes the microstructure and significantly reduces cyclic softening of investigated steels. The evolution of microstructure as a result of fatigue loading at room temperature, 650 and 750°C, was examined by means of transmission electron microscopy. Only minor changes in the microstructure were detected. The stability of oxide particles after high-temperature exposure was confirmed by energy dispersion spectroscopy chemical analysis. The microstructural features are discussed in relation to the cyclic behaviour of the oxide dispersion strengthened steels. The analysis of the hysteresis loop indicates that oxide nanoclusters are intersected and dissolved in slip bands of ODS Eurofer steel. This process contributes to cyclic softening.Keywords steel; microstructure; fatigue.N O M E N C L A T U R E EBSD = electron backscattered diffraction EDS = energy dispersion spectroscopy LAB = low angle boundary ODS = oxide dispersion strengthened RAF = reduced activation ferritic RAFM = reduced activation ferritic-martensitic SEM = scanning electron microscopy STEM = scanning transmission electron microscopy TEM = transmission electron microscopy E eff = effective elastic modulus (MPa) N = number of cycles (À) ε r = relative strain (À) σ a = stress amplitude (MPa) σ Ε = effective stress (MPa) σ I = internal stress (MPa) σ r = relative stress (MPa)

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Section: Discussionmentioning

confidence: 81%

Section: Sources Of Cyclic Stressmentioning

confidence: 99%

Section: Application To Ods Steelsmentioning

confidence: 99%

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Microstructural stability of ODS steels in cyclic loading

Kuběna

Polák

Płociński

et al. 2015

Fatigue Fract Eng Mat Struct

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“…Two peaks can be identified in the plot of the second derivative at all three temperatures. They correspond to the successive cyclic plastic straining of the matrix (γ phase) and coherent γ precipitates (Petrenec et al 2014). The first peak is very weak in room temperature cycling.…”

Section: Nickel Based Superalloymentioning

confidence: 99%

“…The analysis of the loop shape using this generalized statistical theory have been applied to the hysteresis loop of carbon steel , austenitic and duplex stainless steels (Polák et al 2001a, b) and recently also to nickel-based superalloy (Petrenec et al 2014). The statistical theory without considering explicitly the effective stress component has been adopted by Christ (1991), Skelton et al (1997), Heino and Karlsson (2001) and Sivaprasad et al (2010).…”

Section: Introductionmentioning

confidence: 99%