Journal ArticleDOI
Effect of laser shock processing on fatigue crack growth of duplex stainless steel
C. Rubio-González,C. Felix-Martinez,G. Gomez-Rosas,José Luis Ocaña,Miguel Morales,Juan Antonio Porro +5 more
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TLDR
In this article, the effect of laser shock processing on some mechanical properties of 2205 duplex stainless steel was evaluated using a Q-switched Nd:YAG laser, operating at 10 Hz with infrared (1064nm) radiation.Abstract:
Duplex stainless steels have wide application in different fields like the ship, petrochemical and chemical industries that is due to their high strength and excellent toughness properties as well as their high corrosion resistance. In this work an investigation is performed to evaluate the effect of laser shock processing on some mechanical properties of 2205 duplex stainless steel. Laser shock processing (LSP) or laser shock peening is a new technique for strengthening metals. This process induces a compressive residual stress field which increases fatigue crack initiation life and reduces fatigue crack growth rate. A convergent lens is used to deliver 2.5 J, 8 ns laser pulses by a Q-switched Nd:YAG laser, operating at 10 Hz with infrared (1064 nm) radiation. The pulses are focused to a diameter of 1.5 mm. Effect of pulse density in the residual stress field is evaluated. Residual stress distribution as a function of depth is determined by the contour method. It is observed that the higher the pulse density the greater the compressive residual stress. Pulse densities of 900, 1600 and 2500 pul/cm2 are used. Pre-cracked compact tension specimens were subjected to LSP process and then tested under cyclic loading with R = 0.1. Fatigue crack growth rate is determined and the effect of LSP process parameters is evaluated. In addition fracture toughness is determined in specimens with and without LSP treatment. It is observed that LSP reduces fatigue crack growth and increases fracture toughness if this steel.read more
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Journal ArticleDOI
Graphene–aluminum nanocomposites
Stephen F. Bartolucci,Joseph Paras,Mohammad A. Rafiee,J. Rafiee,S. L. Lee,Deepak Kapoor,Nikhil Koratkar +6 more
TL;DR: In this article, the composites of graphene platelets and powdered aluminum were made using ball milling, hot isostatic pressing and extrusion and the mechanical properties and microstructure were studied using hardness and tensile tests, as well as electron microscopy, X-ray diffraction and differential scanning calorimetry.
Journal ArticleDOI
Laser Peening Process and Its Impact on Materials Properties in Comparison with Shot Peening and Ultrasonic Impact Peening
TL;DR: The laser shock peening (LSP) process using a Q-switched pulsed laser beam for surface modification has been reviewed and enhancements in the surface micro and nanohardness, elastic modulus, tensile yield strength and refinement of microstructure which translates to increased fatigue life and fretting fatigue life, stress corrosion cracking (SCC) and corrosion resistance were addressed.
Journal ArticleDOI
Corrosion fatigue of biomedical metallic alloys: Mechanisms and mitigation
TL;DR: The aim was to discuss the correlation between structural and surface aspects of these materials and the onset of fatigue in the highly saline environment of the human body, so that mitigation of corrosion fatigue failure may be achieved in a reliable scientific-based manner.
Journal ArticleDOI
Laser shock peening effect on the dislocation transitions and grain refinement of Al–Mg–Si alloy
TL;DR: In this paper, the effect of laser shock peening without coating parameters on the microstructural evolution, and dislocation configurations induced by ultra-high plastic strains and strain rates was investigated.
Book ChapterDOI
The Contour Method
TL;DR: The contour method is a mechanical measurement technique for mapping residual stresses in engineering structures as discussed by the authors, which relies on the surface deformation that results from stress relaxation over a newly cut plane to calculate the residual stresses that existed in the component before the cut.
References
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Book
Fracture mechanics : fundamentals and applications
TL;DR: Fracture Mechanics: Fundamentals and Applications, Fourth Edition as discussed by the authors is the most useful and comprehensive guide to fracture mechanics available and has been adopted by more than 150 universities worldwide and used by thousands of engineers and researchers.
Journal ArticleDOI
Cross-sectional mapping of residual stresses by measuring the surface contour after a cut
TL;DR: In this paper, a part is cut in two, and the contour, or profile, of the resulting new surface is measured to determine the displacements caused by release of the residual stresses.
Journal ArticleDOI
Laser shock processing : a review of the physics and applications
TL;DR: In this paper, the authors provide an exhaustive account of current trends concerning the physics, the mechanics and the applications involved in laser shock processing (LSP) and present some general and specific data regarding the physical principles of laser shock.
Journal ArticleDOI
Effect of laser shock processing on fatigue crack growth and fracture toughness of 6061-T6 aluminum alloy
C. Rubio-González,José Luis Ocaña,G. Gomez-Rosas,Carlos Molpeceres,Marcelo Paredes,A. Banderas,Juan Antonio Porro,Miguel Morales +7 more
TL;DR: In this article, a convergent lens is used to deliver 1.2-J, 8-ns laser pulses by a Q-switch Nd:YAG laser, operating at 10-Hz.
Journal ArticleDOI
Laser shock peening on fatigue behavior of 2024-T3 Al alloy with fastener holes and stopholes
TL;DR: In this paper, the effect of laser shock peening on the fatigue behavior of 2024-T3 aluminum alloy with a fastener hole, multiple crack stopholes and single-edge notch was investigated.