Martensitic transformation in temporally shaped femtosecond laser shock peening 304 steel

Lian, Yiling; Hua, Yanhong; Sun, Jingya; Wang, Qingsong; Chen, Zhicheng; Wang, Feifei; Zhang, Ke; Lin, Gen; Yang, Zenan; Zhang, Qiang; Jiang, Lan

doi:10.1016/j.apsusc.2021.150855

Cited by 24 publications

(8 citation statements)

References 53 publications

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“…This leads the steel materials to grow more martensite phase which shows significantly better hardness and hence increases the robustness. [ 28 ] Besides, we also propose a strategy for the regeneration of SH‐SSP by simply polishing and remodification. This would provide valuable ideas in solving the recycling issues of superhydrophobic metallic materials.…”

Section: Resultsmentioning

confidence: 99%

Superhydrophobic Stainless Steel Bipolar Plates with Fractal Structure for Fuel Cells by Nanosecond Laser Ablation

Yang

Zhang

et al. 2022

Adv Eng Mater

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Bipolar plate (BP) is one of the crucial components in proton exchange membrane fuel cells (PEMFCs). In extreme cold weather, massive vapor condensation happens right at vehicle start‐ups, which likely causes “water flooding” and thus shortens the lifespan of PEMFCs. Herein, a superhydrophobic stainless steel bipolar plate (SH‐SS BP) that is fabricated by nanosecond laser ablation is reported. Through a repeated low‐energy processing strategy, fractal surface microstructure is fabricated, which has not been reported for SS BP. By grafting stearic acid (SA) monolayer, a robust SH‐SS BP is obtained with a contact angle of 151.74°. The fractal microstructure greatly enhances the contact area between SH‐SS BP and membrane electrode assembly (MEA), which improves interfacial contact resistance (ICR: 9.816 mΩ cm2 at 1.5 MPa). The SH‐SS BP shows significantly enhanced anticorrosion performance (Icorr= 8.191×10‐8 A cm−2) by effectively reducing penetration of corrosive. The ability of improving water management in PEMFC under extreme cold condition is further demonstrated in a simulated PEMFC. This study opens new opportunity to reinforce metallic BPs by a simple, low‐cost, and robust route, which is valuable in improving comprehensive weather fastness of PEMFC.

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Section: Resultsmentioning

confidence: 99%

Superhydrophobic Stainless Steel Bipolar Plates with Fractal Structure for Fuel Cells by Nanosecond Laser Ablation

Yang

Zhang

et al. 2022

Adv Eng Mater

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“…The first variant is nanosecond LSP [1][2][3][4]. The second, relatively young, variant involves ultrashort (femtosecond and picosecond) laser pulses (fs-ps LSP) [5][6][7][8][9][10]. Although nanosecond LSP is more elaborated and widely used, fs-ps LSP has its advantages.…”

Section: Introductionmentioning

confidence: 99%

“…Although nanosecond LSP is more elaborated and widely used, fs-ps LSP has its advantages. First, the protective film is not required; second, irradiation through water is not necessary; and, third, the amplitude of generated shock waves is several orders of magnitude higher [7,8,10]. Let us discuss these features.…”

Section: Introductionmentioning

confidence: 99%

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Melting of Titanium by a Shock Wave Generated by an Intense Femtosecond Laser Pulse

et al. 2022

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Laser shock peening with ultrashort laser pulses has been studied by hydrodynamic and atomistic simulations, as well as experimentally. It has been shown that, in contrast to traditional nanosecond pulses, ultrashort laser pulses allow one to increase the produced pressures by two or three orders of magnitude from 1–10 GPa to 1000 GPa (1 TPa). The physics of phenomena changes fundamentally because shock waves generating pressures exceeding the bulk modulus of a metal melt it. It has been shown for the first time that the shock melting depth at pressures about 1 TPa is an order of magnitude larger than the thickness of the melt layer caused by heat conduction. The appearance, propagation, and damping of a melting shock wave in titanium have been studied. The damping of the shock wave makes it possible to modify the surface layer, where the melting regime changes from a fast one in the shock jump to a slow propagation of the melting front in the unloading tail behind the shock wave. It has been shown experimentally that the ultrafast crystallization of the melt forms a solid layer with a structure strongly different from that before the action. The measured depth of this layer is in good agreement with the calculation.

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“…[12][13][14] Therefore, many studies have obtained high-strength alloys using LSP to control the microstructure of the materials. [15][16][17] For example, high strength and ductility in selective laser melting (SLM) Ti-6Al-4 V alloy were obtained using the LSP process. [18] After LSP treatment, the yield strength and fatigue life of friction stir-welded CuCrZr sheets were increased by about 35% and 70%…”

mentioning

confidence: 99%

Hybrid Nanostructures and Stabilized Mechanical Properties of High‐Entropy Alloy Induced by Warm Laser Shock Peening

Shu

Yuan

et al. 2022

Adv Eng Mater

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High-entropy alloys (HEAs) have attracted much attention due to their excellent mechanical properties. Due to their typical entropy effect, sluggish diffusion, and cocktail effect, HEAs show unexpected performance and have a good prospect in the industry. [1][2][3][4][5] The mechanical properties of HEAs are closely related to the microstructure of materials. Therefore, many researchers have studied the relationship between the microstructure and mechanical properties of HEAs. For example, Nikitin reported that the mechanical properties of CrMnFeCoNi at low temperatures were better than those at room temperature. [6] This is because the deformation mechanism at room temperature mainly involves plane slip dislocation activity, while that at low temperature mainly involves nanotwinning. It was also found by the molecular dynamics (MD) study where dislocation slip replaces grain boundary slip to control plastic deformation of Co 25 Ni 25 Fe 25 Al 7.5 Cu 17.5 at low temperature and high strain rate. [7] Picak demonstrated that Fe 40 Mn 40 Co 10 Cr 10 has different plastic deformation modes in different orientations, and the formation of nanotwins and high-density dislocations enabled the HEA to have high strength without sacrificing ductility. [8] Gubicza showed that the grain refinement and high-density dislocations could significantly improve the strength and ductility of HEA, and the contribution of grain refinement was greater than that of high-density dislocation. [9] In addition, the beneficial microstructure in materials could be induced by severe plastic deformation. [10,11] So, regulating the microstructure of materials through plastic deformation is an effective way to improve the mechanical properties of HEAs.As a widely used surface treatment method, laser shock peening (LSP) can generate strong shock waves inside the workpiece to induce the plastic deformation of the material, resulting in favorable residual stress and beneficial microstructures such as high-density dislocations in the workpiece. [12][13][14] Therefore, many studies have obtained high-strength alloys using LSP to control the microstructure of the materials. [15][16][17] For example, high strength and ductility in selective laser melting (SLM) Ti-6Al-4 V alloy were obtained using the LSP process. [18] After LSP treatment, the yield strength and fatigue life of friction stir-welded CuCrZr sheets were increased by about 35% and 70%

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Martensitic transformation in temporally shaped femtosecond laser shock peening 304 steel

Cited by 24 publications

References 53 publications

Superhydrophobic Stainless Steel Bipolar Plates with Fractal Structure for Fuel Cells by Nanosecond Laser Ablation

Superhydrophobic Stainless Steel Bipolar Plates with Fractal Structure for Fuel Cells by Nanosecond Laser Ablation

Melting of Titanium by a Shock Wave Generated by an Intense Femtosecond Laser Pulse

Hybrid Nanostructures and Stabilized Mechanical Properties of High‐Entropy Alloy Induced by Warm Laser Shock Peening

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