Metal Plasticity and Fatigue at High Temperature

Benasciutti, Denis; Moro, Luciano; Novak, Jelena Srnec

doi:10.3390/met10030326

Cited by 2 publications

(3 citation statements)

References 11 publications

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“…The dislocation must overcome its internal resistance first, and then the crystal slips, causing plastic deformation inside the crystal. When the cyclic stress at the right end is removed, the welded structure will undergo secondary deformation, plastic deformation releases the original deformation of the welded structure, so the residual stress is redistributed and locally attenuated [9].…”

Section: Resultsmentioning

confidence: 99%

Influence of the Laser Welding Direction of Thin DP600 and the Residual Stresses Relaxation Obtained by Simulation and Neutron Diffraction

Liu

Kouadri-Henni

Malard

2022

KEM

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Laser-welded structures are often subjected to dynamic service loads ranging from cyclic fluctuations to completely random ones. The laser-welded lap joints suffer from defects resulting in notch effects, surface cracks, residual strains and stresses. The fatigue strength of the laser-welded lap joints is reduced significantly because of the presence of these defects, and the size of the welded joints is small. Therefore, the mechanical strength of laser-welded structures must be defined in terms of the fatigue strength and residual stress of the obtained joints or assemblies. To analyze the above-discussed effects, this paper proposed two approaches: numerical and experimental methods. The originality of the work is to weld the rolled sheet in three directions (0°, 45°, 90°). The residual stresses before and after low cyclic tensile tests of assemblies obtained from overlapped thin DP600 steel sheets were calculated by ABAQUS. The obtained results were compared to the experimental data by neutron diffraction. The presented results in terms of residual stresses curves, spatial distributions of residual stresses obtained at the end of laser welding and low-cycle fatigue. It showed the relaxation effect of residual stresses and the direction effect of welding. These results have been explained by several factors.

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Section: Resultsmentioning

confidence: 99%

Influence of the Laser Welding Direction of Thin DP600 and the Residual Stresses Relaxation Obtained by Simulation and Neutron Diffraction

Liu

Kouadri-Henni

Malard

2022

KEM

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“…In some cases, there is also a small intermediated zone between RZ and HAZ, which needs further investigations to recognize its nature. [27][28][29]…”

Section: Discussionmentioning

confidence: 99%

“…18. Comparison of density and thermal expansion of construction materials used for aircraft construction;based on[27][28][29]…”

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confidence: 99%

Materials Used in the Combat Aviation Construction

Konieczny

Labisz

2021

Transport Problems

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In this work, an attempt was made to apply laser surface technology for enhancement of the properties and strengthening the material with addition of ceramic phases in the form of silicon and tungsten carbide particles, leading to a remarkable increase in hardness. Thanks to rapid cooling caused by heat being transferred to the cold substrate, an advantageous, fine-grained structure develops, showing higher gradient morphology; furthermore, the surface layers obtained with laser alloying offer greater heat-resistance and anti-corrosion properties, as well as high wear resistance in addition to the aforementioned hardness, which increases by as much as 15% for the AlSi9Cu4 alloy compared with the alloy after standard heat treatment. Such an increase in the values of the mechanical properties makes it possible to use the investigated alloy in applications including, e.g., recyclable thermally exposed surfaces, such as pistons in internal combustion engines, which enables further decrease in the weight and the thermal expansion with simultaneous increase in the strength, reduction in fuel consumption, and increase in carrying load, speed, and range, which generates the need for further research into the area.

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Metal Plasticity and Fatigue at High Temperature

Abstract: The situation in which a component or structure is maintained at high temperature under the action of cyclic thermal and/or mechanical loadings represents, perhaps, one of the most demanding engineering applications—if not, in fact, the most demanding one [...]

Cited by 2 publications

References 11 publications

Influence of the Laser Welding Direction of Thin DP600 and the Residual Stresses Relaxation Obtained by Simulation and Neutron Diffraction

Influence of the Laser Welding Direction of Thin DP600 and the Residual Stresses Relaxation Obtained by Simulation and Neutron Diffraction

Materials Used in the Combat Aviation Construction

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