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.

Laser shock peening: A promising tool for tailoring metallic microstructures in selective laser melting

2019 ◽  
Vol 266 ◽  
pp. 612-618 ◽  
Author(s):  
N. Kalentics ◽  
K. Huang ◽  
M. Ortega Varela de Seijas ◽  
A. Burn ◽  
V. Romano ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Laser Melting ◽  
Promising Tool ◽  
Shock Peening ◽  
Metallic Microstructures

scholarly journals 3D Laser Shock Peening – A new method for the 3D control of residual stresses in Selective Laser Melting

2017 ◽  
Vol 130 ◽  
pp. 350-356 ◽  
Author(s):  
Nikola Kalentics ◽  
Eric Boillat ◽  
Patrice Peyre ◽  
Cyril Gorny ◽  
Christoph Kenel ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Selective Laser Melting ◽  
Laser Shock Peening ◽  
New Method ◽  
Laser Shock ◽  
Laser Melting ◽  
Shock Peening

Corrosion behavior of NiTi alloy subjected to femtosecond laser shock peening without protective coating in air environment

2020 ◽  
Vol 501 ◽  
pp. 144338 ◽  
Author(s):  
Hao Wang ◽  
Jens Jürgensen ◽  
Peer Decker ◽  
Zhiyong Hu ◽  
Kai Yan ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Corrosion Behavior ◽  
Protective Coating ◽  
Niti Alloy ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Shock Peening

Healing cracks in selective laser melting by 3D laser shock peening

2019 ◽  
Vol 30 ◽  
pp. 100881 ◽  
Author(s):  
Nikola Kalentics ◽  
Navid Sohrabi ◽  
Hossein Ghasemi Tabasi ◽  
Seth Griffiths ◽  
Jamasp Jhabvala ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Laser Melting ◽  
Shock Peening

scholarly journals Effects of Laser Shock Peening on Microstructure and Properties of Ti–6Al–4V Titanium Alloy Fabricated via Selective Laser Melting

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3261
Author(s):  
Liang Lan ◽  
Ruyi Xin ◽  
Xinyuan Jin ◽  
Shuang Gao ◽  
Bo He ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Titanium Alloy ◽  
Grain Refinement ◽  
Selective Laser Melting ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Laser Melting ◽  
Α Phase ◽  
Shock Peening

Laser shock peening (LSP) is an innovative surface treatment process with the potential to change surface microstructure and improve mechanical properties of additively manufactured (AM) parts. In this paper, the influences of LSP on the microstructure and properties of Ti–6Al–4V (Ti64) titanium alloy fabricated via selective laser melting (SLM), as an attractive AM method, were investigated. The microstructural evolution, residual stress distribution and mechanical properties of SLM-built Ti64 samples were characterized before and after LSP. Results show that the SLM sample was composed of single hcp α’ phase, which deviates from equilibrium microstructure at room temperature: α + β phases. The LSP significantly refines the grains of α’ phase and produces compressive residual stress (CRS) of maximum magnitude up to −180 MPa with a depth of 250 μm. Grain refinement of α’ phase is attributed to the complex interaction of dislocations and the intersection of deformation twinning subjected to LSP treatment. The main mechanism of strength and micro-hardness enhancement via LSP is ascribed to the effects of CRS and α’ phase grain refinement.

scholarly journals Post-Processing Techniques to Enhance the Quality of Metallic Parts Produced by Additive Manufacturing

Metals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 77
Author(s):  
Muhammad Arif Mahmood ◽  
Diana Chioibasu ◽  
Asif Ur Rehman ◽  
Sabin Mihai ◽  
Andrei C. Popescu
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Post Processing ◽  
Laser Polishing ◽  
Shock Peening ◽  
Processing Techniques ◽  
Am Processes ◽  
Conventional Machining

Additive manufacturing (AM) processes can produce three-dimensional (3D) near-net-shape parts based on computer-aided design (CAD) models. Compared to traditional manufacturing processes, AM processes can generate parts with intricate geometries, operational flexibility and reduced manufacturing time, thus saving time and money. On the other hand, AM processes face complex issues, including poor surface finish, unwanted microstructure phases, defects, wear tracks, reduced corrosion resistance and reduced fatigue life. These problems prevent AM parts from real-time operational applications. Post-processing techniques, including laser shock peening, laser polishing, conventional machining methods and thermal processes, are usually applied to resolve these issues. These processes have proved their capability to enhance the surface characteristics and physical and mechanical properties. In this study, various post-processing techniques and their implementations have been compiled. The effect of post-processing techniques on additively manufactured parts has been discussed. It was found that laser shock peening (LSP) can cause severe strain rate generation, especially in thinner components. LSP can control the surface regularities and local grain refinement, thus elevating the hardness value. Laser polishing (LP) can reduce surface roughness up to 95% and increase hardness, collectively, compared to the as-built parts. Conventional machining processes enhance surface quality; however, their influence on hardness has not been proved yet. Thermal post-processing techniques are applied to eliminate porosity up to 99.99%, increase corrosion resistance, and finally, the mechanical properties’ elevation. For future perspectives, to prescribe a particular post-processing technique for specific defects, standardization is necessary. This study provides a detailed overview of the post-processing techniques applied to enhance the mechanical and physical properties of AM-ed parts. A particular method can be chosen based on one’s requirements.

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