Twinning Behavior in Magnesium Alloys Processed by Laser Shock Peening

2019 ◽  
Author(s):  
Bo Mao ◽  
Yiliang Liao ◽  
Bin Li
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloys ◽  
Microstructure Evolution ◽  
Laser Intensity ◽  
Deformation Twinning ◽  
Mg Alloys ◽  
Laser Shock Peening ◽  
Surface Microstructure ◽  
Laser Shock ◽  
Shock Peening

Abstract In this paper, the surface microstructure evolution of an AZ31B magnesium (Mg) alloy during laser shock peening (LSP) was investigated. Particular attention was paid to the deformation twinning behavior, which plays an important role in the mechanical properties of Mg alloys. The effect of laser intensity on the twinning distribution was investigated. Twin-twin interactions during LSP process were characterized. The mechanism responsible for the formation of gradient twinning microstructure and twinning-induced hardening effect were discussed.

Microstructure evolution and mechanical properties of a lamellar near-α titanium alloy treated by laser shock peening

Vacuum ◽  
2021 ◽  
Vol 184 ◽  
pp. 109906
Author(s):  
Weiju Jia ◽  
Yaoxu Zan ◽  
Chengliang Mao ◽  
Silan Li ◽  
Wei Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Microstructure Evolution ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Shock Peening

Effect of Laser Shock Peening on micro-structure and mechanical properties of Friction Stir Welded CuCrZr sheets

2021 ◽  
pp. 142238
Author(s):  
Abhijit Sadhu ◽  
Sagar Sarkar ◽  
Angshuman Chattopadhyay ◽  
Omkar Mypati ◽  
Surjya K. Pal ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Micro Structure ◽  
Friction Stir ◽  
Shock Peening

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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