Multilayer modelling of stainless steel with a nanocrystallised superficial layer

Petit, Johann; Waltz, Laurent; Montay, Guillaume; Retraint, Delphine; Roos, Arjen; François, Manuel

doi:10.1016/j.msea.2011.12.085

Cited by 20 publications

(16 citation statements)

References 15 publications

(15 reference statements)

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“…The change of cyclic behaviour of the SMATed samples with respect to the untreated ones is due to the SMAT affected region which generally enhances the global mechanical strength of the SMATed samples under monotonic loading [4,20,21]. In this paper, the strengthening effect of shot impacts is manifested by the increase of the global stress level induced by SMAT, as shown in Fig.…”

Section: Hardness Measurementmentioning

confidence: 74%

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Low cycle fatigue of 316L stainless steel processed by surface mechanical attrition treatment (SMAT)

et al. 2018

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In this work, the effect of surface mechanical attrition treatment (SMAT) on the cyclic behaviour of a 316L stainless steel under low cycle fatigue (LCF) is investigated. The LCF results are presented in the form of cyclic stress amplitude evolution for both untreated and SMATed samples. In order to better understand the microstructure change due to cyclic loading, electron backscatter diffraction (EBSD) is used to characterize the microstructure of the SMATed samples before and after fatigue tests. A microstructure gradient is highlighted for samples after SMAT from the top surface layer in nanocrystalline grains to the interior region non-affected by impacts. Under LCF loading, new slip systems are activated in the work hardened region, whereas no plastic slip is activated in the nanostructured layer. The residual stresses generated by SMAT are measured using X-ray diffraction (XRD), and their relaxations under cyclic loading are studied by taking into account the microstructure change. The cyclic behaviour of the samples in different material states is interpreted based on these investigations.

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Section: Hardness Measurementmentioning

confidence: 74%

“…Microhardness was measured to assess the change of mechanical strength in the SMAT affected region, as frequently done in the literature [4,20,21]. Fig.…”

Section: Hardness Measurementmentioning

confidence: 99%

Low cycle fatigue of 316L stainless steel processed by surface mechanical attrition treatment (SMAT)

et al. 2018

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“…In order to achieve high mechanical strength with acceptable plasticity simultaneously, the ultrasonic-assisted surface mechanical attrition treatment (SMAT) can be applied [7,8]. However, the SMAT allows for refining of the grain size only at the surface layer that extends to the depth of up to several dozen micrometres, preserving the ductility of the core [9][10][11]. Thus, the SMAT alone is insufficient to improve mechanical strength of bulk materials.…”

Section: Introductionmentioning

confidence: 99%

Characterization of nanocrystallised multilayered metallic materials produced by the SMAT followed by constrained compression

Bajda

Dymek

Krzyżanowski

et al. 2018

Materials Characterization

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Nanocrystallised multilayered metallic material was obtained via duplex technique combining the surface mechanical attrition treatment (SMAT) with a novel constrained compression (CC) process. At the initial stage the 1 mm thick sheets of 316L austenitic stainless steel were processed by the SMAT in order to form a nanocrystalline structure. At the final stage discshaped plates excised from SMATed sheets, were assembled in a package and compressed in order to produce metallurgical bonding between individual plates. The characterization of such a multilayered structure was studied both experimentally and numerically. The microscopic examination revealed that the bonding occurred in the central portions of the package where the oxide scale covering each plate was fragmented by high shear strains. The numerical analysis confirmed that the strains at the interior interfaces are significantly higher than at the external ones. A high degree of structural inhomogeneity was observed via TEM studies in the regions where the successful bonding was achieved. Regions characterised by fine band structure with the presence of α′-martensite phase as well as coarse cellular structure within a single γ-austenite phase were identified.

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“…A nanocrystallised structure can be observed up to several tens of micrometers below the surface and, as the depth increases, a hardened transition zone is observed at the layer of about 200 μm depth characterised by a grain size gradient [8,[15][16][17]. Such limited volume fraction of the refined grains restricts thickness of the sample that is going to be processed by SMAT to value of the order of 1 mm.…”

Section: Introductionmentioning

confidence: 99%

Inhomogeneity of plastic deformation in austenitic stainless steel after surface mechanical attrition treatment

Bajda

Ratuszek

Krzyżanowski

et al. 2017

Surface and Coatings Technology

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Inhomogeneity of microstructure evolution in cold-rolled austenitic stainless steel after surface mechanical attrition treatment (SMAT) was investigated. A characteristic deformation pattern was obtained for all studied specimens. Selected areas were examined through X-ray diffraction (XRD) and scanning electron microscopy (SEM). Calculations of the α'-martensite volume fraction below the treated surfaces showed, that some of the studied areas are characterised by a few dozen percent different amount of α'-martensite phase. The performed finite element (FE) numerical analysis revealed, that the reason for this may be the presence of an air gap between the impacted material and fixation and also because of the relatively short high stress time duration due to surface inclination during the surface treatment. Annealing at 550 and 650 °C doubled or sometimes tripled the volume fraction of α'-martensite and formed Fe2O3 as well as Fe3O4, whereas annealing at 700 °C resulted in both disappearance of α'-martensite and in reduction of the oxides.

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Multilayer modelling of stainless steel with a nanocrystallised superficial layer

Cited by 20 publications

References 15 publications

Low cycle fatigue of 316L stainless steel processed by surface mechanical attrition treatment (SMAT)

Low cycle fatigue of 316L stainless steel processed by surface mechanical attrition treatment (SMAT)

Characterization of nanocrystallised multilayered metallic materials produced by the SMAT followed by constrained compression

Inhomogeneity of plastic deformation in austenitic stainless steel after surface mechanical attrition treatment

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