Deformation of polycrystalline TRIP stainless steel micropillars

Roa, J.J.; Wheeler, Jeffrey M.; Trifonov, T.; Fargas, Gemma; Mateo, A.; Michler, Johann; Jiménez‐Piqué, E.

doi:10.1016/j.msea.2015.08.082

Cited by 20 publications

(20 citation statements)

References 61 publications

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“…These results are in agreement with previous studies which demonstrate that, in austenitic grains deformed by cold working, the presence of microbands and twins provide not only strain hardening but also serve as nucleation sites to promote the formation of strain-induced martensite [33,34,35]. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 …”

Section: -Results and Discussionsupporting

confidence: 93%

Influence of pre-existing martensite on the wear resistance of metastable austenitic stainless steels

Fargas

Roa

Mateo

2016

Wear

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The effect of pre-existing martensite on the sliding wear behaviour of a commercial metastable austenitic stainless steel was investigated. Two different steel conditions were considered: annealed (with a fully austenitic microstructure) and cold rolled, consisting of mixtures of austenite and martensite. Wear tests were carried out using ball on disc technique at constant velocity and different sliding distances. Correlation between microstructure and wear mechanisms was performed by X-ray diffraction, electron back-scattered diffraction and focus ion beam. Results show that wear resistance decrease at increasing the amount of pre-existing martensite. In this sense, the strain-induced martensite developed at higher degree for cold rolled samples which strengths the surface and consequently reduces plowing wear mechanism, typical of ductile abrasive wear. The detailed analysis of the wear track demonstrated the formation of ultrafine-grains layer just below the surface not only for annealed but also for cold rolled steel conditions. For both cases, the main wear mechanism developed for the studied sliding distances was tribocorrosion. WEAR Confirmation of AuthorshipPlease save a copy of this MS Word file, complete and upload as the "Confirmation of Authorship" file.As corresponding author, I Gemma Fargas, hereby confirm on behalf of all authors that:1) The authors have obtained the necessary authority for publication.2) The paper has not been published previously, that it is not under consideration for publication elsewhere, and that if accepted it will not be published elsewhere in the same form, in English or in any other language, without the written consent of the publisher. 3) The paper does not contain material which has been published previously, by the current authors or by others, of which the source is not explicitly cited in the paper.Upon acceptance of an article by the journal, the author(s) will be asked to transfer the copyright of the article to the publisher. This transfer will ensure the widest possible dissemination of information. AbstractThe effect of pre-existing martensite on the sliding wear behaviour of a commercial metastable austenitic stainless steel was investigated. Two different steel conditions were considered: annealed (with a fully austenitic microstructure) and cold rolled, consisting of mixtures of austenite and martensite. Wear tests were carried out using ball on disc technique at constant velocity and different sliding distances. Correlation between microstructure and wear mechanisms was performed by X-ray diffraction, electron back-scattered diffraction and focus ion beam. Results show that wear resistance decrease at increasing the amount of pre-existing martensite. In this sense, the strain-induced martensite developed at higher degree for cold rolled samples which strengths the surface and consequently reduces plowing wear mechanism, typical of ductile abrasive wear. The detailed analysis of the wear track demonstrated the formation of ultrafine-grains layer ...

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Section: -Results and Discussionsupporting

confidence: 93%

Influence of pre-existing martensite on the wear resistance of metastable austenitic stainless steels

Fargas

Roa

Mateo

2016

Wear

Self Cite

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“…Furthermore, as seen in Figure b, the flow stress is isotropic, with a constant value ranged between 1.1 and 1.3 GPa. The σ f values reported in Table are in agreement with those determined through the micropillar compressions tests on TRIP stainless steel …”

Section: Resultsmentioning

confidence: 91%

Influence of the Crystallographic Orientation on the Yield Strength and Deformation Mechanisms of Austenitic Grains in Metastable Stainless Steels Investigated by Spherical Nanoindentation

Roa

Súarez

Yang

et al. 2019

steel research int.

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The mechanical behavior of a metastable stainless steel is studied by spherical nanoindentation, as a function of crystallographic orientation of its austenitic grains. The residual imprints are analyzed by electron backscattered diffraction (inverse pole figure, phase and geometrically necessary dislocation maps) and atomic force microscopy. Results showed that austenite grains with the most common crystallographic orientations display similar elasto‐to‐plastic transition, being the dislocation activity by the Frank‐Read source the main deformation mechanism. However, the amount of dislocations generated during indentation testing strongly depends on the crystallographic orientation. No evidence of stress‐induced phase transformation is observed.

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“…In this regard, at least two SF are required for the formation of a ϵ ‐band, with a respective unit displacement of around 0.1 nm depending on the certain slip system. Furthermore, recently, Roa et al found that the formation of ϵ ‐martensite is preferentially located in the regions near the grain boundary, where the material experienced complex stress fields, like higher shear stresses during compression. For those reasons, Δ h pop‐in reported in this study corresponds to the formation of around five to ten ϵ ‐platelets.…”

Section: Resultsmentioning

confidence: 99%

“…In this regard, ϵ ‐martensite may be considered as a dislocation pile‐up of SFs on every second {111} austenite plane, being the

γ \Rightarrow ϵ

transformation a rather simple process. Recently, Roa et al observed the

γ \Rightarrow ϵ

martensitic phase transformation in highly sheared austenitic zones, mainly located at the grain boundary.…”

Section: Introductionmentioning

confidence: 99%

Reversible Phase Transformation in Polycrystalline TRIP Steels Induced by Cyclic Indentation Performed at the Nanometric Length Scale

Rovira

Sapezanskaia

Fargas

et al. 2018

steel research int.

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Metastable austenitic stainless steels are an interesting group of materials, which exhibit the Transformation Induced Plasticity effect. In this regard, phase transformation from austenite to martensite enhances the work hardening of the metastable austenitic stainless steels affecting the deformation dynamics and mechanical properties including fatigue properties. Within this context, the reversible load-induced phase transformation from γ to e-martensite is investigated at the local scale under cyclic indentation. This reversible phase transformation is manifested itself by a combination of hysteresis loops, elbow formation, and reversible pop-ins in the loading curve. The initial cyclic achieved through the nanoindentation technique allows to identify three different deformation regimes for the <111> austenitic grains. Firstly, a softening effect takes place due to the dislocation activation; subsequently the phase transformation induces a hardening effect and finally, the load deformation curve reaches a plateau where no more plastic deformation is observed. Experimental Section

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Deformation of polycrystalline TRIP stainless steel micropillars

Cited by 20 publications

References 61 publications

Influence of pre-existing martensite on the wear resistance of metastable austenitic stainless steels

Influence of pre-existing martensite on the wear resistance of metastable austenitic stainless steels

Influence of the Crystallographic Orientation on the Yield Strength and Deformation Mechanisms of Austenitic Grains in Metastable Stainless Steels Investigated by Spherical Nanoindentation

Reversible Phase Transformation in Polycrystalline TRIP Steels Induced by Cyclic Indentation Performed at the Nanometric Length Scale

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