Enhanced Fatigue Property of Welded S355J2W Steel by Forming a Gradient Nanostructured Surface Layer

An, Lu; Sun, Yijing; Lu, Shanping; Wang, Zhenbo

doi:10.1007/s40195-020-01046-8

Cited by 6 publications

(3 citation statements)

References 25 publications

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“…Surface hardening is so critical for resisting crack initiation so as to improve the mechanical and impact performance of UHMWPE. , Laser shock wave peening is a new route for creating three-dimensional crystallization with a smooth surface at different conditions, which can generate over 100 GPa transient shock pressure. , The pulsed laser shock technique could generate irradiation with ultrahigh strain rate shock wave (10 6 –10 7 s –1 ), which would compress the surface layers and induce thermal heating by high energy. Because of such high pressure and local heating, laser shock overcomes the limitations of nanoscale formability of the crystallization of polymers.…”

Section: Resultsmentioning

confidence: 99%

Hierarchical Structural Engineering of Ultrahigh-Molecular-Weight Polyethylene

Shao

Armstrong

et al. 2020

ACS Appl. Mater. Interfaces

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Nature has inspired the design of next-generation lightweight architectured structural materials, for example, nacre-bearing extreme impact and paw-pad absorbing energy. Here, a bioinspired functional gradient structure, consisting of an impact-resistant hard layer and an energy-absorbing ductile layer, is applied to additively manufacture ultrahigh-molecular-weight polyethylene (UHMWPE). Its crystalline graded and directionally solidified structure enables superior impact resistance. In addition, we demonstrate nonequilibrium processing, ultrahigh strain rate pulsed laser shock wave peening, which could trigger surface hardening for enhanced crystallinity and polymer phase transformation. Moreover, we demonstrate the paw-pad-inspired soft- and hard-fiber-reinforced composite structure to absorb the impact energy. The bioinspired design and nonequilibrium processing of graded UHMWPE shed light on lightweight engineering polymer materials for impact-resistant and threat-protection applications.

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Section: Resultsmentioning

confidence: 99%

Hierarchical Structural Engineering of Ultrahigh-Molecular-Weight Polyethylene

Shao

Armstrong

et al. 2020

ACS Appl. Mater. Interfaces

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“…The diagrams of Figures 6-9 showcase the gradient of plastic deformation which can be quantified and translated to stress and strain as presented in Figure 10. The intense plastic deformation of the subsurface is also evidenced by the microstructure of the longitudinal sections [25,26].…”

Section: Nanoindentation and Layered σ-ε Propertiesmentioning

confidence: 95%

Stress-Shot-Peened Leaf Springs Material Analysis through Nano- and Micro-Indentations

2021

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Heat-treated and shot-peened lightweight steels with demanding requirements for durability are applied in high-performance automotive leaf springs. Due to their heat-treatment they exhibit degraded properties in the surface-near area compared to the core. This area, which may extend until 300 μm from the surface to the core, experiences the highest bending stresses at operation. The microstructure in the surface and sub-surface layers determines the mechanical performance as well as the wear resistance. The present study refers to the material properties of a stress shot-peened 51CrV4 steel at various depths from the surface. The effect of the manufacturing process has been captured both by Vickers micro-hardness measurements and nanoindentation. The latter combined with a Fine Element Method (FEM)-based algorithm enables the determination of variations in the material’s stress–strain curves over the affected layers, which translate to internal stress changes. The nanoindentation technique has been applied here successfully for the first time ever on leaf springs. The combination of microstructural analysis, microhardness and nanoindentation captures the changes of the treated material, offering insights on the material characteristics, and yielding accurate elastoplastic material properties for local, layered-based analysis of the components’ mechanical performance at operational loading scenarios, i.e. in the framework of stress shot-peening simulation models.

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“…Due to its operability with directional impacts on the surface of materials, UIT/UNSM is considered as a promising technique for strengthening parts with welded joints. The improvement in the fatigue strength of welded joints after UNSM has been generally observed and investigated in a large number of studies [68][69][70][71][72][73]. For instance, for a low-alloy steel, Strenx 700 MC, it was discovered by Lago et al [72] that UIT was able to transform the tensile residual stresses in the welded material and heat-affected zone to compressive residual stresses.…”

Section: High-cycle Fatigue After Smatmentioning

confidence: 99%

Literature Review on the Fatigue Properties of Materials Processed by Surface Mechanical Attrition Treatment (SMAT)

Gao

Sun

Retraint

2022

Metals

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As a promising surface treatment technique, the surface mechanical attrition treatment (SMAT) has been applied to enhance mechanical properties of various materials. Through multidirectional severe plastic deformation, SMAT is able to nanocrystallize the near surface region of materials. The nanostructured layer associated with high compressive residual stresses coupled with a work hardening layer can provide the treated materials with an improved fatigue resistance. The present work gives a comprehensive review on the fatigue strength of SMATed materials. First of all, a brief introduction is given on the basic elements of SMAT and surface modifications induced by this treatment. The fatigue strength of a large variety of SMATed materials with different loading conditions is reviewed, including low-cycle fatigue (LCF), high-cycle fatigue (HCF) and very-high-cycle fatigue (VHCF). Then, the mechanism of enhancement or reduction is explained through a detailed review on the effects of several factors, such as residual stress, surface quality and nanocrystalline grains. In addition, the combined effect of SMAT coupled with other processes is also reviewed. Trends and prospects of the current research are summarized at the end.

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Enhanced Fatigue Property of Welded S355J2W Steel by Forming a Gradient Nanostructured Surface Layer

Cited by 6 publications

References 25 publications

Hierarchical Structural Engineering of Ultrahigh-Molecular-Weight Polyethylene

Hierarchical Structural Engineering of Ultrahigh-Molecular-Weight Polyethylene

Stress-Shot-Peened Leaf Springs Material Analysis through Nano- and Micro-Indentations

Literature Review on the Fatigue Properties of Materials Processed by Surface Mechanical Attrition Treatment (SMAT)

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