Deformation and microstructure evolution of a duplex stainless steel under out-of-phase thermo-mechanical fatigue

Kolmorgen, R.; Weidner, Anja; Biermann, Horst

doi:10.3184/096034013x665890

Cited by 6 publications

(2 citation statements)

References 12 publications

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“…Apparently, planar gliding is also the predominant glide behavior in austenitic grains during isothermal fatigue at 300 • C (Figure 4b). It can be concluded that in contrast to the room temperature experiment, the plastic response is now governed by the dislocation arrangement in the ferritic grain in accordance with previous studies by Kolmorgens et al [1,30].…”

Section: Isothermal Fatiguesupporting

confidence: 89%

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Characterization of the Isothermal and Thermomechanical Fatigue Behavior of a Duplex Steel Considering the Alloy Microstructure

Schellert

Müller

Ohrndorf

et al. 2022

Metals

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Isothermal and thermomechanical fatigue behavior of duplex stainless steel (DSS) X2CrNiMoN22-5-3 was investigated. The aim of this work was to understand the fatigue behavior by correlation of the isothermal and thermomechanical fatigue behavior with microstructural observations. Fatigue tests at plastic-strain-amplitude of 0.2% were carried out at 20, 300 and 600 °C, while in-phase (IP) and out-of-phase (OP) thermomechanical fatigue (TMF) experiments were performed between 300 and 600 °C. During the 20 °C fatigue test, a continuous softening was observed. Transmission electron microscopy examinations reveal pronounced planar slip behavior in austenite. At 300 °C, deformation concentrates in the ferrite, where strong interactions between CrxN and dislocations were observed that explain the pronounced cyclic hardening. DSS studied exhibits softening throughout the whole isothermal fatigue test at 600 °C. In ferrite, during the 600 °C fatigue test, the G phase, γ′ austenite precipitated, and an unordered dislocation arrangement was observed. The stress responses of the TMF tests can be correlated to those of the isothermal fatigue tests. In IP mode, a positive mean stress resulted in premature failure. No γ′ austenite but the formation of subgrains in the ferrite phase was observed after TMF tests. The plastic deformation of the austenite at high temperatures results in an unordered dislocation arrangement.

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Section: Isothermal Fatiguesupporting

confidence: 89%

“…Furthermore, a higher dislocation density can be observed at the boundaries between neighboring austenite and ferritic grains, indicating the pileup of defects. Obviously, phase boundaries act as barriers to dislocation glide [30,31]. Only individual dislocation loops are visible in the ferritic grain.…”

Section: Isothermal Fatiguementioning

confidence: 99%

Characterization of the Isothermal and Thermomechanical Fatigue Behavior of a Duplex Steel Considering the Alloy Microstructure

Schellert

Müller

Ohrndorf

et al. 2022

Metals

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Application of a Modified Stress−Strain Approach for the Fatigue‐Life Prediction of a Ferritic, an Austenitic and a Ferritic–Austenitic Duplex Steel under Isothermal and Thermo‐Mechanical Fatigue

Kulawinski

Kolmorgen

Biermann

2016

steel research int.

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The isothermal and thermo‐mechanical fatigue behavior of the ferritic–austenitic duplex stainless steel X2CrNiMoN22‐5‐3 is investigated in the temperature range of 100–600 °C. Furthermore, isothermal and thermo‐mechanical fatigue tests on single‐phase ferritic and austenitic reference steels are carried out within the same temperature range. A recently developed fatigue‐lifetime description is applied and modified for all tests as well as on the different steels individually, providing appropriate fatigue‐life predictions.

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Decomposition and Precipitation Process During Thermo-mechanical Fatigue of Duplex Stainless Steel

Weidner

Kolmorgen

Kuběna

et al. 2016

Metall Mater Trans A

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Deformation and microstructure evolution of a duplex stainless steel under out-of-phase thermo-mechanical fatigue

Cited by 6 publications

References 12 publications

Characterization of the Isothermal and Thermomechanical Fatigue Behavior of a Duplex Steel Considering the Alloy Microstructure

Characterization of the Isothermal and Thermomechanical Fatigue Behavior of a Duplex Steel Considering the Alloy Microstructure

Application of a Modified Stress−Strain Approach for the Fatigue‐Life Prediction of a Ferritic, an Austenitic and a Ferritic–Austenitic Duplex Steel under Isothermal and Thermo‐Mechanical Fatigue

Decomposition and Precipitation Process During Thermo-mechanical Fatigue of Duplex Stainless Steel

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