In situ room temperature tensile deformation of a 1% CrMoV bainitic steel using synchrotron and neutron diffraction

Weisser, M.A.; Evans, Alexander; Petegem, S. Van; Holdsworth, S.R.; Swygenhoven, H. Van

doi:10.1016/j.actamat.2011.03.068

Cited by 40 publications

(17 citation statements)

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“…Also a macroscopic misfit strain was estimated from a Rietveld refinement analysis of the complete diffraction spectrum [26]. For the POLDI measurements, a larger 4 mm × 4 mm × 6 mm gauge volume was used and the sampling time for each measurement was 1800 s. A Gaussian function single peak fitting was used to determine the lattice spacing [27].…”

Section: Measurement Of Misfit Strains and Stressesmentioning

confidence: 99%

Role of the misfit stress between grains in the Bauschinger effect for a polycrystalline material

Chen

Wang

et al. 2015

Acta Materialia

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. (2015) Role of the misfit stress between grains in the Bauschinger effect for a polycrystalline material. Acta Materialia, http://dx.doi.org/10.1016/j.actamat. .11.021 DOI 10.1016/j.actamat.2014.11.021 ISSN 1359 Publisher: Elsevier Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders. This document is the author's post-print version, incorporating any revisions agreed during the peer-review process. Some differences between the published version and this version may remain and you are advised to consult the published version if you wish to cite from it. AbstractThe role of misfit stress on kinematic hardening under reversed straining of a Type 316H austenitic stainless steel has been investigated by using the neutron diffraction technique combined with in-situ deformation. Initial misfit stresses, often referred to an intergranular internal stresses, were created by the tensile pre-straining at high temperature. The misfit stresses at the length-scale of grain families, measured by neutron diffraction, were shown to be a function of the magnitude of the tensile prestrain. The pre-strained specimens were further subjected to either continued (tensile) straining or reversed (compressive) straining at room temperature. In-situ neutron diffraction measurements were undertaken to monitor the change of the misfit stresses during loading. The macroscopic stress-strain behaviour was used to derive isotropic and kinematic hardening stresses developed in the pre-strained specimens. Resultsshow that the change of the transient softening stress towards a zero value is accompanied by a decrease in the change of the misfit stresses. A multi-scale selfconsistent model has been developed to assist in understanding the measured change of the misfit stresses when subjecting the material to strain reversal. An important conclusion is that the origin of the kinematic hardening of Type 316H austenitic stainless steel arises from the misfit stress between grains.

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Section: Measurement Of Misfit Strains and Stressesmentioning

confidence: 99%

Role of the misfit stress between grains in the Bauschinger effect for a polycrystalline material

Chen

Wang

et al. 2015

Acta Materialia

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“…4c) as a function of applied stress during tensile loading. The (1 2 2) and (3 0 1) cementite peaks provide a sufficient intensity for single peak fitting (Weisser et al, 2011), the {2 1 1} Fe peak is shown as reference for the matrix behaviour. The lattice strain is calculated from the relative change (d mode À d mode 0 )/d mode 0 of the mode of the fitting function, the broadening is calculated from the relative change FWHM/d mode of the full-width at half-maximum (FWHM), the index 0 refers to the condition before deformation.…”

Section: Resultsmentioning

confidence: 99%

“…The microstructure consists of cementite and vanadium carbide particles (with a total volume fraction less then 3%) embedded in a ferrite matrix. Previous work on this material reports on the build-up of large type II microstresses during deformation at ambient temperature (Weisser et al, 2011). From this material carbide powder was extracted electrolytically from an undeformed sample and a sample deformed until 5% plastic strain.…”

Section: Methodsmentioning

confidence: 99%

“…However, the characteristics of the plastic behaviour under uniaxial tensile deformation are still debated. X-ray and neutron diffraction suggest a composite like behaviour with load transfer from the plastifying ferrite matrix to the cementite, which remains elastic (Weisser et al, 2011;Wilson and Konnan, 1964;Oliver et al, 2004;Young et al, 2007;Daymond and Priesmeyer, 2002). In these studies the diffraction peaks from both phases evidence peak broadening.…”

Section: Introductionmentioning

confidence: 92%

“…Cementite is often considered elastic isotropic in computational frameworks. Recent calculations (Nikolussi et al, 2008) suggest however that cementite exhibits a very strong elastic anisotropy, for which also experimental evidence has been found (Nikolussi et al, 2008;Weisser et al, 2011). An assessment on literature has recently been published underlining an ongoing debate (Alkorta and Sevillano, 2012).…”

Section: Introductionmentioning

confidence: 93%

See 2 more Smart Citations

On the origin of cementite diffraction peak broadening during tensile deformation at ambient temperatures

Weisser

Petegem

Cervellino

et al. 2015

International Journal of Plasticity

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Impact of the Microstructure on the U–O Forming Simulations of a Ferrite–Pearlite Pipeline Tube

Laschet

Shukla

Henke

et al. 2014

steel research int.

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In order to take into account the dual‐phase ferrite/pearlite microstructures of the X65 steel in the simulations of the U‐ and O forming steps of the production of a gas pipeline tube, a multi‐scale approach based on a two‐level homogenization scheme is applied. Three different scales are introduced: the nano‐scale of a ferrite‐cementite bi‐lamella of pearlite, the pearlite/ferrite microstructure and the macro‐scale. Firstly, homogenization is applied to a bi‐lamella representative volume element (RVE) of pearlite. Secondly, pearlite is treated at the micro‐scale as an effective phase with an anisotropic flow curve in an elasto‐plastic ferrite matrix. The predicted flow curves of the X65 steel are in a rather good agreement with experimental stress–strain curves in rolling and transverse directions, respectively. The cooling step produces in the steel sheet different microstructures in the center and at its skins. The surficial microstructure has slightly less pearlite content, reduced lamella spacing and a lower residual dislocation density. The effective flow behavior at the sheet skins is determined and the impact of the different microstructure features is quantified. At the macro‐scale, 2D plane strain FE simulations of the U–O forming steps are then performed twice: once with the reference flow curve and once with different flow curves in the sheet center and at its skins. Thus, the accuracy increase due to locally different flow curves is outlined. Eventually, the most critical local macro‐stress/strain state of the O forming step is extracted and applied as boundary condition on the corresponding microstructure in order to evaluate the micro‐stresses and strains and to locate its critical areas.

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In situ room temperature tensile deformation of a 1% CrMoV bainitic steel using synchrotron and neutron diffraction

Cited by 40 publications

References 30 publications

Role of the misfit stress between grains in the Bauschinger effect for a polycrystalline material

Role of the misfit stress between grains in the Bauschinger effect for a polycrystalline material

On the origin of cementite diffraction peak broadening during tensile deformation at ambient temperatures

Impact of the Microstructure on the U–O Forming Simulations of a Ferrite–Pearlite Pipeline Tube

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