Fatigue Lifetime Improvement of Aluminum Alloys

Author(s):  
Patiphan Juijerm ◽  
Berthold Scholtes

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.

2021 ◽  
Vol 5 (3) ◽  
pp. 98
Author(s):  
Daniel Meyer ◽  
Matthias Hettig ◽  
Nicole Mensching

Several manufacturing processes are used to beneficially influence the surface and subsurface properties of manufactured parts. Different aspects such as the surface topography or resulting residual stresses are addressed using different manufacturing processes. This paper presents the first approach for pulsed mechanical surface treatment (PMST), a new manufacturing process aiming to combine the mechanics used in deep rolling and shot or hammer peening. The process can generate a defined surface topography while constantly impinging a mechanical impact on the workpiece. Two different tools (type 1 and type 2) have been designed to approach this new concept. Hardened carbide pins are used for type 1 to prove the concept using a simpler kinematic and resulting in a burnishing-like process. For type 2, hardened roller is used and results in an actual rolling process. Specimens made of S235 are processed in experiments with tool type 1 with varying pulse frequency and feeds. The resulting surface topography is described using optical measurement systems while micro-hardness measurements are used to describe the subsurface properties. The results in general show an increase of hardness in the surface and subsurface layer while the resulting surface topography can be directly controlled by the process parameters and therefore be designed for specific functional properties.


1983 ◽  
Vol 38 (2) ◽  
pp. 252-255
Author(s):  
S. V. Mentus

Abstract The dependence of complex impedance behaviour on mechanical surface treatment of glassy carbon electrodes in standard water KCl solutions at room temperature was investigated. A considerable frequency dependence of both the real and the imaginary term of the impedance was observed in the entire 1-50 kHz range of frequencies used for electrodes of different surface roughness. The results are discussed in the light of the Levie theory.


2010 ◽  
Author(s):  
Omar Abo-Namous ◽  
Markus Kästner ◽  
Eduard Reithmeier ◽  
Martin Nicolaus ◽  
Kai Möhwald ◽  
...  

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

2017 ◽  
Vol 88 (3-4) ◽  
pp. 383-395 ◽  
Author(s):  
Armand Kanjer ◽  
Virgil Optasanu ◽  
Luc Lavisse ◽  
María del Carmen Marco de Lucas ◽  
Steeve Dejardin ◽  
...  

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