Strain rate sensitivity of the ultrastrong gradient nanocrystalline 316L stainless steel and its rate-dependent modeling at nanoscale

Yin, Fei; Hu, Shan; Xu, Rong; Han, Xiaotao; Qian, Dongsheng; Wei, Wenting; Hua, Lin; Zhao, Kejie

doi:10.1016/j.ijplas.2020.102696

Cited by 51 publications

(18 citation statements)

References 62 publications

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“…It is characterized by a maximum value of 500 HV measured 50 µm below the surface and an estimated total hardened layer of about 600 µm. Thesevalues are consistent with data from the literature on the 316L and 304L alloys after comparable surface mechanical attrition treatments[34,40,52,53]. After cyclic loading for one cycle or more, the curves of the SMAT + Fat RTC, SMAT + Fat RTT, and SMAT + 1Cy RTT samples depict a general gradient evolution that is quite similar to the reference SMAT one.…”

supporting

confidence: 90%

On the high cycle fatigue resistance of austenitic stainless steels with surface gradient microstructures: Effect of load ratio and associated residual stress modification

Dureau

Arzaghi

Massion

et al. 2022

Materials Science and Engineering: A

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supporting

confidence: 90%

On the high cycle fatigue resistance of austenitic stainless steels with surface gradient microstructures: Effect of load ratio and associated residual stress modification

Dureau

Arzaghi

Massion

et al. 2022

Materials Science and Engineering: A

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“…Our model was able to reproduce the stressstrain curve and the shear band patterns of the gradient Cu obtained from experiments. It is worth noting that strain rate may also affect shear band formation in gradient metals, since previous experimental studies have shown that the mechanical behavior of the gradient metals is rate-dependent [34,69]. We will investigate the influence of strain rate on shear banding behavior of gradient metals in a future study.…”

Section: Discussionmentioning

confidence: 97%

Modelling the Shear Banding in Gradient Nano-Grained Metals

Chen

2021

Nanomaterials

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Extensive experiments have shown that gradient nano-grained metals have outstanding synergy of strength and ductility. However, the deformation mechanisms of gradient metals are still not fully understood due to their complicated gradient microstructure. One of the difficulties is the accurate description of the deformation of the nanocrystalline surface layer of the gradient metals. Recent experiments with a closer inspection into the surface morphology of the gradient metals reported that shear bands (strain localization) occur at the surface of the materials even under a very small, applied strain, which is in contrast to previously suggested uniform deformation. Here, a dislocation density-based computational model is developed to investigate the shear band evolution in gradient Cu to overcome the above difficulty and to clarify the above debate. The Voronoi polygon is used to establish the irregular grain structure, which has a gradual increase in grain size from the material surface to the interior. It was found that the shear band occurs at a small applied strain in the surface region of the gradient structure, and multiple shear bands are gradually formed with increasing applied load. The early appearance of shear banding and the formation of abundant shear bands resulted from the constraint of the coarse-grained interior. The number of shear bands and the uniform elongation of the gradient material were positively related, both of which increased with decreasing grain size distribution index and gradient layer thickness or increasing surface grain size. The findings are in good agreement with recent experimental observations in terms of stress-strain responses and shear band evolution. We conclude that the enhanced ductility of gradient metals originated from the gradient deformation-induced stable shear band evolution during tension.

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“…Previous studies have found that NC ASTM F-138 austenitic SSs have higher mechanical strength than their CG counterpart [15,50,51]. Heidari et al found that the ASTM F2581 nanocrystalline stainless steels had 824 MPa yield strength, and the strength exceeded 1 GPa [51].…”

Section: Biomedical Nc Stainless Steels (Sss)mentioning

confidence: 99%

Recent Progress on Nanocrystalline Metallic Materials for Biomedical Applications

Wang

Wen

2022

Nanomaterials

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Nanocrystalline (NC) metallic materials have better mechanical properties, corrosion behavior and biocompatibility compared with their coarse-grained (CG) counterparts. Recently, nanocrystalline metallic materials are receiving increasing attention for biomedical applications. In this review, we have summarized the mechanical properties, corrosion behavior, biocompatibility, and clinical applications of different types of NC metallic materials. Nanocrystalline materials, such as Ti and Ti alloys, shape memory alloys (SMAs), stainless steels (SS), and biodegradable Fe and Mg alloys prepared by high-pressure torsion, equiangular extrusion techniques, etc., have better mechanical properties, superior corrosion resistance and biocompatibility properties due to their special nanostructures. Moreover, future research directions of NC metallic materials are elaborated. This review can provide guidance and reference for future research on nanocrystalline metallic materials for biomedical applications.

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Strain rate sensitivity of the ultrastrong gradient nanocrystalline 316L stainless steel and its rate-dependent modeling at nanoscale

Cited by 51 publications

References 62 publications

On the high cycle fatigue resistance of austenitic stainless steels with surface gradient microstructures: Effect of load ratio and associated residual stress modification

On the high cycle fatigue resistance of austenitic stainless steels with surface gradient microstructures: Effect of load ratio and associated residual stress modification

Modelling the Shear Banding in Gradient Nano-Grained Metals

Recent Progress on Nanocrystalline Metallic Materials for Biomedical Applications

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