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.

scholarly journals Electrochemical Corrosion Characteristics of High Strength Low Alloy Domex 700 Steel After Mechanical Surface Treatment in Chloride Environment

2017 ◽  
Vol 61 (5) ◽  
pp. 162-168 ◽  
Author(s):  
K. Borko ◽  
F. Pastorek ◽  
B. Hadzima
Keyword(s):  
Corrosion Resistance ◽  
Surface Treatment ◽  
Shot Peening ◽  
Steel Surface ◽  
Electrochemical Impedance ◽  
High Strength ◽  
Fatigue Properties ◽  
Electrochemical Tests ◽  
Mechanical Surface Treatment ◽  
Mechanical Surface

Abstract Nowadays a large number of mechanical surface treatments of constructions materials is used in industry, mainly focusing on steel surface treatment. The aim of this study was to evaluate the effects of mechanical surface pre-treatment (grinding and shot peening) on corrosion resistance of high strength low alloy Domex 700 steel. Suitable mechanical surface treatment can by used for surface homogenization (eg. grinding) or for improvement of mechanical, strength and fatigue properties (shot peening). 0,1M NaCl solution of ambient temperature was used as an environment for electrochemical tests. Evaluation of the mechanical surface treatment effect on corrosion resistance of Domex 700 steel surface was realized by electrochemical tests: potentiodynamic polarization tests (using Tafel analysis) and electrochemical impedance spectroscopy (using equivalent circuit). From the obtained results it is possible to conclude, that the process of mechanical surface treatment by shot peening at choosen conditions has negative effect on corrosion resistance of Domex 700 steel.

Increasing the fatigue strength of high-strength steel parts by repeated treatment with shot peening

2020 ◽  
pp. 79-82
Author(s):  
G.N. Kravchenko ◽  
K.G. Kravchenko
Keyword(s):  
Fatigue Strength ◽  
Shot Peening ◽  
High Strength Steel ◽  
High Strength ◽  
Resource Recovery ◽  
Repeated Treatment ◽  
Multiple Processing

The effectiveness of multiple hardening by shot peening of samples made of «30ХГСН2А» high-strength steel to increase their fatigue strength is experimentally established. Repeated hardenings allow not only to restore the original durability and even significantly increase it. Keywords fatigue strength, durability, resource recovery, multiple processing by shot peening, repeated hardening, high-strength steel. [email protected]

Investigations on the Fatigue Property of the High-Strength and Toughness 211Z Casting Aluminium Alloy

2013 ◽  
Vol 423-426 ◽  
pp. 197-201
Author(s):  
Xiao Min Zhang ◽  
Jian Mao ◽  
Yun Che ◽  
Zhong Ke Zhang
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Strength ◽  
High Cycle Fatigue ◽  
Testing Machine ◽  
High Strength ◽  
Cycle Fatigue ◽  
Fracture Appearance ◽  
Casting Aluminum Alloy ◽  
Casting Aluminum ◽  
Strength And Toughness

211Z is a new type of high strength and toughness Al-Cu-Mn casting aluminum alloy. With the aid of GPS-100 high-cycle fatigue testing machine and DDL100 multifunction tensile testing machine, conventional mechanics performance tests and high-cycle fatigue tests were carried out in this paper. The conventional mechanical property results show that the tensile strength is 477.5 MPa, the theory yield strength is 397.5 MPa and the elongation is 6.625%. Fatigue experiments were performed with load control at room temperature and R =-1 in ambient air. The tensile and compression fatigue strength is 130 MPa under ten million times fatigue test, and S-N fatigue life curve of this alloy was also given in the investigations. 211Z casting aluminum alloy possessing high fatigue strength can be attributed to the fact that it owns high strength and good plasticity simultaneously. The microstructure analysis of fatigue fracture appearance shows that, the fatigue crack initiation behavior of this aluminium alloys depends mainly on the region possessing defects under the surface, there has only one crack source, which means it is belongs to low nominal stress unidirectional bending. In the crack growth stage, the width of fatigue striations decreases with the increase of stress, and a few secondary cracks were found in this stage. When cracks finally losed stability, an instantaneous fracture occured in the investigated samples. Shear lips and dimples were found in the fracture appearance and the final fracture is belongs to ductile fracture.

scholarly journals Mechanism of Fatigue Life Improvement due to Fine Particle Shot Peening in High Strength Aluminum Alloy

2010 ◽  
Vol 74 (6) ◽  
pp. 370-377 ◽  
Author(s):  
Akiko Inoue ◽  
Takahiro Sekigawa ◽  
Kazuyuki Oguri ◽  
Tetsuya Tagawa ◽  
Takashi Ishikawa
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Life ◽  
Shot Peening ◽  
Fine Particle ◽  
High Strength ◽  
High Strength Aluminum Alloy ◽  
Life Improvement

Improvement of Fatigue Strength of Aluminum Alloy by Cavitation Shotless Peening

2002 ◽  
Vol 124 (2) ◽  
pp. 135-139 ◽  
Author(s):  
Hitoshi Soyama ◽  
Kenichi Saito ◽  
Masumi Saka
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Strength ◽  
Shot Peening ◽  
High Speed ◽  
Bending Fatigue ◽  
Hydraulic Machinery ◽  
Bending Fatigue Test ◽  
Rotating Bending Fatigue ◽  
Rotating Bending ◽  
Cavitation Shotless Peening

Cavitation impact, which normally produces severe damage in hydraulic machinery, can be used to modify surfaces in the same way as shot peening. Cavitation impact enables the surface of a material to be peened without the use of shot, thus it is called cavitation shotless peening. As there are no solid body collisions occurring in this peening process, the roughness of the peened surface should be less than that produced by shot peening. This characteristic makes it suitable for peening soft metals. In order to demonstrate the improvement of the fatigue strength of aluminum alloy by this process, specimens were subjected to the process, and then tested in a rotating bending fatigue test. Cavitation impacts were produced and controlled by using a submerged high speed water jet with cavitation, i.e., a cavitating jet. It was revealed that the fatigue strength of an aluminum alloy specimen treated by this peening process was 50% stronger than that of a specimen without peening.

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