Dependence of nanoindentation hardness with crystallographic orientation of austenite grains in metastable stainless steels

Roa, J.J.; Fargas, Gemma; Mateo, A.; Jiménez‐Piqué, E.

doi:10.1016/j.msea.2015.07.096

Cited by 54 publications

(37 citation statements)

References 56 publications

(53 reference statements)

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“…2a and b for tests undertaken under loading or displacement control modes, respectively. Initial values (1st cycle) for hardness and elastic modulus for both testing modes are in good agreement with those reported in the literature for austenitic metastable stainless steels [24], but vary from austenitic grain to grain depending on the crystallographic orientation as reported Roa et al [25].…”

Section: Resultssupporting

confidence: 90%

Influence of testing mode on the fatigue behavior of <111> austenitic grain at the nanometric length scale for TRIP steels

Roa

Sapezanskaia

Fargas

et al. 2018

Materials Science and Engineering: A

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Metastable austenitic stainless steels, and in particular the TRansformation Induced Plasticity steels, rely on a phase transformation from a ductile austenite to a slightly harder martensite. These materials under fatigue testing conditions at the macrometric length scale can induce a softening or hardening effect as a function of the underlying deformation feature activated. Thus, given the interaction of single grains in polycrystalline materials, the collective response to macroscopic fatigue testing is not trivial to interpret. Within this context, small scale tests are required to obtain a more in detail understanding of the fatigue properties at the local level of those materials. In this regard, cyclic nanoindentation tests represent a suitable technique to give insight on the local fatigue of metastable stainless steels for a certain crystallographic orientation. In this experimental work, the influence of the testing mode (loading and/or displacement control mode) on the fatigue behavior of <111> austenitic grains as a function of their micromechanical properties as well as their deformation features was investigated in detail. It was found that the experiments done under loading control mode could be compared to conventional low cycle fatigue tests. In contrast when experiments were performed under displacement control mode they may be compared to high cycle fatigue tests. Furthermore, the microstructural observation by transmission electron microscopy allowed to observe the formation of shear bands. This phenomenon preceded the apparition of martensitic laths during the cyclic indentation process.

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Section: Resultssupporting

confidence: 90%

Influence of testing mode on the fatigue behavior of <111> austenitic grain at the nanometric length scale for TRIP steels

Roa

Sapezanskaia

Fargas

et al. 2018

Materials Science and Engineering: A

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“…While microcompression induces a relatively uniaxial stress state in a single crystal specimen, nanoindentation requires that a minimum of five unique slip systems be active for the material to accommodate strain. Accordingly, microcompression results tend to be highly dependent on grain orientation, whereas many authors report comparatively small orientation-dependent differences for nanoindentation results of similar materials [24,30], as observed in this study. Although conventional tensile testing is uniaxial in nature, the elastic and plastic properties measured are effectively an average over all grain orientations in the sample.…”

Section: Discussionsupporting

confidence: 47%

Nanoindentation and in situ microcompression in different dose regimes of proton beam irradiated 304 SS

Reichardt

Lupinacci

Frazer

et al. 2017

Journal of Nuclear Materials

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Recent developments in micromechanical testing have allowed for the efficient evaluation of radiation effects in micron-scale volumes of ion-irradiated materials. In this study, both nanoindentation and in situ SEM microcompression testing are carried out on 10 dpa proton beam irradiated 304 stainless steel to assess radiation hardening and radiation-induced deformation mechanisms in the material. Using a focused ion beam (FIB), arrays of 2 μm x 2 μm cross-section microcompression pillars are fabricated in multiple dose regimes within the same grain, providing dose-dependent behavior in a single crystal orientation. Analysis of the microcompression load-displacement data and real-time SEM imaging during testing indicates significant hardening, as well as increased localization of deformation in the irradiated material. Although nanoindentation results suggest that irradiation hardening saturates at low doses, microcompression results indicate that the pillar yield stress continues to rise with dose above 10 dpa in the tested orientation.

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“…In undeformed materials it is well known that the hardness depends on the crystallographic orientations of the grains [19], and that areas near grain boundaries may differ from grain interiors [e.g . 20].…”

Section: Nucleation At Hardness Indentsmentioning

confidence: 99%

Crystallographic Analysis of Nucleation at Hardness Indentations in High-Purity Aluminum

Zhang

Lin

et al. 2016

Metall Mater Trans A

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Nucleation at Vickers hardness indentations has been studied in high purity aluminum cold rolled 12%. Electron channeling contrast was used to measure the size of the indentations and to detect nuclei, while electron backscattering diffraction was used to determine crystallographic orientations. It is found that indentations are preferential nucleation sites. The crystallographic orientations of the deformed grains affect the hardness and the nucleation potentials at the indentations. Higher hardness gives increased nucleation probabilities. Orientation relationships between nuclei developed at different indentations within one original grain are analyzed and it is found that the orientation distribution of the nuclei is far from random. It is suggested that it relates to the orientations present near the indentation tips which in turn depend on the orientation of the selected grain in which they form. Finally possible nucleation mechanisms are briefly discussed.

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Dependence of nanoindentation hardness with crystallographic orientation of austenite grains in metastable stainless steels

Cited by 54 publications

References 56 publications

Influence of testing mode on the fatigue behavior of <111> austenitic grain at the nanometric length scale for TRIP steels

Influence of testing mode on the fatigue behavior of <111> austenitic grain at the nanometric length scale for TRIP steels

Nanoindentation and in situ microcompression in different dose regimes of proton beam irradiated 304 SS

Crystallographic Analysis of Nucleation at Hardness Indentations in High-Purity Aluminum

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