scholarly journals Laser Cavitation Peening and Its Application for Improving the Fatigue Strength of Welded Parts

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 531
Author(s):  
Hitoshi Soyama
Keyword(s):  
Laser Ablation ◽  
Fatigue Strength ◽  
Surface Treatment ◽  
Polyvinylidene Fluoride ◽  
High Speed ◽  
Metallic Material ◽  
Mechanical Surface Treatment ◽  
Steel Welds ◽  
The Impact ◽  
Mechanical Surface

During conventional submerged laser peening, the impact force induced by laser ablation is used to produce local plastic deformation pits to enhance metallic material properties, such as fatigue performance. However, a bubble, which behaves like a cavitation, is generated after laser ablation, known as “laser cavitation.” On the contrary, in conventional cavitation peening, cavitation is generated by injecting a high-speed water jet into the water, and the impacts of cavitation collapses are utilized for mechanical surface treatment. In the present paper, a mechanical surface treatment mechanism using laser cavitation impact, i.e., “laser cavitation peening,” was investigated, and an improvement in fatigue strength from laser cavitation peening was demonstrated. The impact forces induced by laser ablation and laser cavitation collapse were evaluated with a polyvinylidene fluoride (PVDF) sensor and a submerged shockwave sensor, and the diameter of the laser cavitation was measured by observing a high-speed video taken with a camera. It was revealed that the impact of laser cavitation collapse was larger than that of laser ablation, and the peening effect was closely related to the volume of laser cavitation. Laser cavitation peening improved the fatigue strength of stainless-steel welds.

Fatigue Lifetime Improvement of Aluminum Alloys

2019 ◽  
Author(s):  
Patiphan Juijerm ◽  
Berthold Scholtes
Keyword(s):  
Aluminum Alloys ◽  
Surface Treatment ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Deep Rolling ◽  
Fatigue Lifetime ◽  
Mechanical Surface Treatment ◽  
Strong Candidate ◽  
And Behavior ◽  
Mechanical Surface

Today, aluminum alloys are being considered as substitutes for many automotive parts made from steels because of the growing interest in producing lightweight vehicles. Consequently, it is crucial to understand the fatigue lifetime—the property itself and its behavior—of aluminum alloys, and to clarify its capacities at both room temperature and 1001 elevated temperatures. In particular, the aluminum alloys in the AA5xxx (non-precipitation-hardenable) and AA6xxx (precipitation-hardenable) series are very similar to those found in automotive industries, and are both frequently mentioned and the focus of studies. The satisfactory fatigue lifetime and the improved strength of aluminum alloys make them a strong candidate for automotive industries. This article focuses upon the fatigue property and behavior of aluminum alloys at room temperature and elevated temperatures. Then, the focus will shift to the concept of mechanical surface treatment, the so-called deep-rolling process, which can be used to improve the fatigue lifetime of aluminum alloys. The effects of a mechanical surface treatment on the fatigue properties and behavior of the aluminum alloys AA5083 and AA6110, and the residual stress stability at room temperature and elevated temperatures has been discussed. Moreover, modified deep-rolling processes, i.e., deep-rolling followed by an appropriate annealing process and high-temperature deep-rolling, have been elaborated upon in this article.

Mechanical surface treatment to obtain optically cooperative surfaces vis-à-vis fringe projection

2010 ◽  
Author(s):  
Omar Abo-Namous ◽  
Markus Kästner ◽  
Eduard Reithmeier ◽  
Martin Nicolaus ◽  
Kai Möhwald ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Fringe Projection ◽  
Mechanical Surface Treatment ◽  
Mechanical Surface

scholarly journals Fatigue Strength Enhancement of Butt Welds by Means of Shot Peening and Clean Blasting

Metals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 744 ◽  
Author(s):  
Jonas Hensel ◽  
Hamdollah Eslami ◽  
Thomas Nitschke-Pagel ◽  
Klaus Dilger
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Strength ◽  
Surface Treatment ◽  
Shot Peening ◽  
Surface Preparation ◽  
High Strength ◽  
Butt Welds ◽  
Strength Enhancement ◽  
Lack Of Control ◽  
Mechanical Surface

Shot peening is a mechanical surface treatment to improve the fatigue strength of metallic components. Similarities exist between regular shot peening and conventional industrial clean blasting. However, the main difference between these two processes is the peening media used and the lack of control and documentation of peening parameters. The clean blasting process is not yet qualified to optimize fatigue enhancement, although it holds a similar potential to regular shot peening. Clean blasting is frequently applied to welded components, with the purpose of surface preparation for application of corrosion protection. This article presents the results of regular shot peened double V-groove (DV) butt welds made from construction steels S355N and S960QL, as well as the high strength aluminum alloy Al-6082. The peening parameters are varied widely. Furthermore, the effect of coverage and intensity is investigated to test the robustness of the peening processes. The data is completed with industrially clean blasted welds, representing typical workshop conditions. The overall objective of this work is to derive minimum peening parameters that still allow significant fatigue strength benefits. The presented data show a high robustness of the fatigue results to peening parameters.

Influence of Mechanical surface treatment on the strength of mixed adhesive joint

2018 ◽  
Vol 5 (9) ◽  
pp. 18776-18788 ◽  
Author(s):  
N.S. Hirulkar ◽  
P.R. Jaiswal ◽  
Pirondi Alessandro ◽  
Paulo Reis
Keyword(s):  
Surface Treatment ◽  
Adhesive Joint ◽  
Mechanical Surface Treatment ◽  
Mechanical Surface

scholarly journals Influence of Mechanical Surface Treatment on High-Temperature Oxidation of Pure Titanium

2017 ◽  
Vol 88 (3-4) ◽  
pp. 383-395 ◽  
Author(s):  
Armand Kanjer ◽  
Virgil Optasanu ◽  
Luc Lavisse ◽  
María del Carmen Marco de Lucas ◽  
Steeve Dejardin ◽  
...  
Keyword(s):  
High Temperature ◽  
Surface Treatment ◽  
High Temperature Oxidation ◽  
Pure Titanium ◽  
Temperature Oxidation ◽  
Mechanical Surface Treatment ◽  
Mechanical Surface
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