scholarly journals Laser Shock Peening of Ti6Al4V Alloy with Combined Nanosecond and Femtosecond Laser Pulses

Metals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 26
Author(s):  
Rujian Sun ◽  
Guangzhi He ◽  
Hailin Bai ◽  
Jianfeng Yan ◽  
Wei Guo
Keyword(s):  
Femtosecond Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Laser Shock Peening ◽  
Metallic Materials ◽  
Laser Shock ◽  
Laser Absorption ◽  
Shock Peening ◽  
Surface Morphologies ◽  
Equiaxed Grains

Laser shock peening (LSP) with nanosecond or femtosecond laser pulses is applied to improve the mechanical properties of metallic materials. Thus, it is necessary to compare the effects of different processing methods on microstructure changes and property improvement. In this study, nanosecond LSP (NLSP), femtosecond LSP (FLSP), and LSP with combined nanosecond and femtosecond laser pulses (F-NLSP) are conducted on Ti6Al4V alloys to compare the surface morphologies, in-depth microstructures, and nanohardness changes. In FLSP, the peened surface is smooth, and the affected depth is limited near the peened surface. NLSPed and F-NLSPed samples present rough surfaces due to the severe ablation process. Small equiaxed grains with no preferred grain orientation are denser in F-NLSPed samples than that in NLSPed samples. Compared with NLSPed samples, the affected depth and amplitude of in-depth nanohardness are larger in F-NLSPed samples. This is attributed to the increased laser absorption of incident laser on the treated surface by femtosecond laser pulses. The results in this study show the effects of different LSP methods and provide chances in engineering potentials for material property improvements.

Martensitic Transformation in Temporally Shaped Femtosecond Laser Shock Peening 304 Steel

2021 ◽  
pp. 150855
Author(s):  
Yiling Lian ◽  
Yanhong Hua ◽  
Jingya Sun ◽  
Qingsong Wang ◽  
Zhicheng Chen ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Femtosecond Laser ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Shock Peening

scholarly journals Corrosion Behavior of NiTi Alloys Fabricate by Selective Laser Melting Subjected to Femtosecond Laser Shock Peening

Coatings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1078
Author(s):  
Long Ma ◽  
Wanqing Li ◽  
Yongzhi Yang ◽  
Yuanxue Ma ◽  
Kai Luo ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Femtosecond Laser ◽  
Selective Laser Melting ◽  
Niti Alloy ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Laser Melting ◽  
Corrosion Failure ◽  
Niti Alloys ◽  
Shock Peening

NiTi alloys are commonly used in many fields such as aerospace, mechanical engineering due to their excellent mechanical properties and shape memory effect. In recent years, the emergence of selective laser melting (SLM) technology provides a new method for the preparation of NiTi parts. But the surface corrosion failure of SLM-NiTi is the most common problem. This paper mainly focuses on the research of femtosecond laser shock peening of the surface of SLM-NiTi alloy to improve the corrosion resistance. Selecting different scanning space (1 μm, 3 μm, 5 μm, 10 μm), and analyze the surface morphology of the material through the OM, SEM, EDS and white light interferometer, and investigate the surface nanohardness and corrosion resistance through nanoindentation and electrochemical testing. The research results show that part of the TiO2 is formed under different scanning spaces, and part of NiO is formed when the scanning space is 1μm. At the same time, it is found that the sample under the condition of 10 μm has the most excellent corrosion resistance and nanohardness. The nanohardness reaches 1303 ± 40 HV and the corrosion current density reaches 1.45 ± 0.1 × 10−9 A·cm−2. Proper femtosecond laser treatment can effectively improve the surface strength and corrosion resistance of the NiTi alloys.

scholarly journals Effect of Laser Shock Peening on the Surface Morphology of Metallic Glasses

2017 ◽  
Vol 898 ◽  
pp. 689-695
Author(s):  
Yan Sen Li ◽  
Kun Zhang ◽  
Gui Hua Duan ◽  
Guang Yue Xu ◽  
Yu Hang Wei ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Surface Morphology ◽  
Metallic Glasses ◽  
Close Correlation ◽  
Laser Shock Peening ◽  
Morphology Evolution ◽  
Laser Shock ◽  
Localized Structures ◽  
Shock Peening ◽  
Surface Morphologies

Laser shock peening is a promising effective approach for improving mechanical properties of metallic glass. In this work, laser shock peening was employed to study the surface morphologies of metallic glasses with different toughness. Numerous localized circular-or arc-shaped structures, with the size of 5~20 μm, were observed in the shock treated surface. The number of these unique localized structures has a close correlation to the ability of metallic glass to accommodate plastic deformation. In addition, the surface morphology evolution of Zr-based metallic glasses with different crystalline degrees is also discussed, indicating that the circular-or arc-shaped structures only appear in fully amorphous system.

scholarly journals Effective femtosecond laser shock peening on a Mg–3Gd alloy at low pulse energy 430 µJ of 1 kHz

2019 ◽  
Vol 7 (3) ◽  
pp. 529-535 ◽  
Author(s):  
Chenghao Lu ◽  
Licheng Ge ◽  
Bing Zhu ◽  
Yangxin Li ◽  
Xianfeng Chen ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Pulse Energy ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Shock Peening

The effects of the confining medium and protective layer during femtosecond laser shock peening

2021 ◽  
Vol 27 ◽  
pp. 26-30
Author(s):  
Yuxin Li ◽  
Zhencheng Ren ◽  
Xiao Jia ◽  
Wenjing Yang ◽  
Naas Nassreddin ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Protective Layer ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Shock Peening
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