Evaluation of Deformation Residual Stresses Caused by Uniaxial Plastic Strain of Ferritic and Ferritic-Austenitic Steels / Ermittlung der durch einachsige plastische Dehnung verursachten Verformungseigenspannungen in ferritischen und ferritisch-austenitischen Stählen

Hauk, Viktor; Nikolin, Hans-Joachim; Pintschovius, L.

doi:10.1515/ijmr-1990-810803

Cited by 2 publications

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“…The {220} lattice planes of fcc materials have shown to be very susceptible and can be taken as an indicator for the presence of this kind of microstresses, which is confirmed in Fig. 3 [17,18]. The developments of the mean phase-stresses are shown in Fig.…”

Section: Resultsmentioning

confidence: 73%

Stability and Relaxation of Homogeneous Microstresses in Two-Phase Steels with Cyclic Loading

Renner

Behnken

Hauk

et al. 2005

MSF

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The development of residual stresses during cyclic loading was investigated for a duplex stainless steel with nearly balanced portions of ferrite and austenite. The parameters of the study are the predeformation of the material, the loading mode and the loading amplitude. The X-ray stress evaluation distinguishes between macrostress, homogeneous microstresses of the phases as well as orientation dependent microstresses between the crystallites. Pulsating bending was applied to achieve pure tension on one surface of the specimen and compression on the opposite side. The presented investigations prove a remarkable stability of the homogeneous microstresses independent of the height of the stress amplitude even when exceeding the yield strength. In the steel investigated microstresses change only if macroscopic plastic deformation opposite to the predeformation takes place during cyclic loading. That holds as well for orientation dependent microstresses but the latter appear to be more susceptive to change on plastic deformation.

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Section: Resultsmentioning

confidence: 73%

Stability and Relaxation of Homogeneous Microstresses in Two-Phase Steels with Cyclic Loading

Renner

Behnken

Hauk

et al. 2005

MSF

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On the Oscillating Course of dhkl−sin2ψ Plots for Plastically Deformed, Cold-Rolled Ferritic and Duplex Stainless Steel Sheets

2023

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This work deals with non-linear dhkl−sin2ψ distributions, often observed in X-ray residual stress analysis of plastically deformed metals. Two different alloys were examined: duplex stainless steel EN 1.4362 with an austenite:ferrite volume ratio of 50:50 and ferritic stainless steel EN 1.4016. By means of an in situ experiment with high-energy synchrotron X-ray diffraction, the phase-specific lattice strain response under increasing tensile deformation was analysed continuously with a sampling rate of 0.5 Hz. From Debye–Scherrer rings of nine different lattice planes {hkl}, the dhkl−sin2ψ distributions were evaluated and the phase-specific stresses were calculated. For almost all lattice planes investigated, oscillating courses in the dhkl−sin2ψ distributions were observed, already occurring below the macro yield point and increasing in amplitude within the elasto-plastic region. By comparing the loaded and the unloaded state after deformation, the contribution of crystallographic texture and plastically induced intergranular strains to these oscillations could be separated. For the given material states, only a minor influence of crystallographic texture was observed. However, a strong dependence of the non-linearities on the respective lattice plane was found. In such cases, a stress evaluation according to the sin2ψ method leads to errors, which increase significantly if only a limited ψ range is considered.

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Evaluation of Deformation Residual Stresses Caused by Uniaxial Plastic Strain of Ferritic and Ferritic-Austenitic Steels / Ermittlung der durch einachsige plastische Dehnung verursachten Verformungseigenspannungen in ferritischen und ferritisch-austenitischen Stählen

Cited by 2 publications

References 0 publications

Stability and Relaxation of Homogeneous Microstresses in Two-Phase Steels with Cyclic Loading

Stability and Relaxation of Homogeneous Microstresses in Two-Phase Steels with Cyclic Loading

On the Oscillating Course of dhkl−sin2ψ Plots for Plastically Deformed, Cold-Rolled Ferritic and Duplex Stainless Steel Sheets

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