High temperature mechanical properties and surface fatigue behavior improving of steel alloy via laser shock peening

2014 ◽  
Vol 53 ◽  
pp. 452-456 ◽  
Author(s):  
N.F. Ren ◽  
H.M. Yang ◽  
S.Q. Yuan ◽  
Y. Wang ◽  
S.X. Tang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Fatigue Behavior ◽  
Laser Shock Peening ◽  
Steel Alloy ◽  
Laser Shock ◽  
Surface Fatigue ◽  
High Temperature Mechanical Properties ◽  
Shock Peening

Alternative Mechanical Surface Treatments for Fatigue Strength Enhancement

2005 ◽  
Vol 490-491 ◽  
pp. 328-333 ◽  
Author(s):  
I. Altenberger
Keyword(s):  
Residual Stress ◽  
High Temperature ◽  
Strain Aging ◽  
Fatigue Behavior ◽  
Laser Shock Peening ◽  
Dynamic Strain ◽  
Laser Shock ◽  
Deep Rolling ◽  
Shock Peening ◽  
Mechanical Surface

In this paper, The effects of laser-shock peening and high temperature deep rolling on nearsurface microstructures, residual stress states and fatigue behavior of various metallic materials are investigated and discussed. Similar to warm peening (shot peening at elevated temperatures), high temperature deep rolling may induce several favourable effects, especially in ferritic steels, where dynamic strain aging by carbon atoms can be exploited as a major strengthening mechanism. But also in materials without ‚classical‘ strain aging high temperature deep rolling is effective in improving the fatigue behaviour by inducing favourable, e.g. precipitation-hardened, nearsurface microstructures. As a consequence, these modified near-surface microstructures directly alter the thermal and mechanical relaxation behaviour of residual stresses. Laser-shock peening is already used in the aircraft industry (as a mechanical surface treatment for fan-blades) and owes its benefial effects to deep layers of compressive residual stress and work hardening and a relatively smooth surface roughness. Characteristic examples of microstructures and residual stress profiles as generated by laser-shock peening are presented. Moreover, the impact on the fatigue behavior of steels and a titanium alloy is outlined and discussed.

Microstructural response and improving surface mechanical properties of pure copper subjected to laser shock peening

2021 ◽  
pp. 150336
Author(s):  
Boxin Wei ◽  
Jin Xu ◽  
Y. Frank Cheng ◽  
Jiajun Wu ◽  
Cheng Sun ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Pure Copper ◽  
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

High temperature wear performance of Ti–6.5Al–3.5Mo–1.5Zr–0.3Si alloy subjected to laser shock peening

2018 ◽  
Vol 34 (18) ◽  
pp. 2294-2304 ◽  
Author(s):  
Xudong Ren ◽  
Zhaopeng Tong ◽  
Wangfan Zhou ◽  
Lan Chen ◽  
Yunpeng Ren ◽  
...  
Keyword(s):  
High Temperature ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Wear Performance ◽  
High Temperature Wear ◽  
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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