Characterization, corrosion behavior, cellular response and in vivo bone tissue compatibility of titanium-niobium alloy with low Young's modulus.

Laser shock peening effect on the dislocation transitions and grain refinement of Al–Mg–Si alloy

Surface nanocrystallization of metallic alloys with different stacking fault energy induced by laser shock processing

In this study, the fatigue performance of AISI 304 subjected to shot peening (SP), ultrasonic nanocrystal surface modification (UNSM) and the combination of SP + UNSM processes was systematically assessed by rotary bending fatigue (RBF) tester at different stress levels. The purpose of combining SP and UNSM processes is to find out whether SP following UNSM process can further improve the fatigue life of AISI 304 in comparison with the SP and UNSM processes alone. Interestingly, the fatigue strength of AISI 304 was deteriorated by the combination of SP + UNSM processes in comparison with the UNSM process alone, but the combination of SP + UNSM processes demonstrated a higher fatigue strength in comparison with the SP process alone.

Effect of combined shot peening and ultrasonic nanocrystal surface modification processes on the fatigue performance of AISI 304

Laser shock peening-induced surface gradient stress distribution and extension mechanism in corrosion fatigue life of AISI 420 stainless steel

Effect of advancing direction on fatigue life of 316L stainless steel specimens treated by double-sided laser shock peening

Eigenstrain simulation of residual stresses induced by laser shock processing in a Ti6Al4V hip replacement

Profiting by the increasing availability of laser sources delivering intensities above 109 W/cm2 with pulse energies in the range of several Joules and pulse widths in the range of nanoseconds, Laser Shock Processing (LSP) is being consolidated as an effective technology for the improvement of surface mechanical and corrosion resistance properties of metals and is being developed as a practical process amenable to production engineering. The main acknowledged advantage of the LSP technique includes its capability of inducing a relatively deep compression residual stresses field into metallic alloy pieces allowing an improved mechanical behaviour, explicitly, the life improvement of the treated specimens against wear, crack growth and stress corrosion cracking. In this paper, experimental results on the residual stress profiles and associated surface properties modification successfully reached in typical materials (specifically steels and Aluminium (Al) and Titanium (Ti) alloys) under different LSP irradiation conditions are presented.

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Laser Shock Processing: an emerging technique for the enhancement of surface properties and fatigue life of high-strength metal alloys

Laser shock processing (LSP) is being increasingly applied as an effective technology for the improvement of metallic materials mechanical and surface properties in different types of components as a means of enhancement of their corrosion and fatigue life behavior. As reported in previous contributions by the authors, a main effect resulting from the application of the LSP technique consists on the generation of relatively deep compression residual stresses field into metallic alloy pieces allowing an improved mechanical behaviour, explicitly the life improvement of the treated specimens against wear, crack growth and stress corrosion cracking. Additional results accomplished by the authors in the line of practical development of the LSP technique at an experimental level (aiming its integral assessment from an interrelated theoretical and experimental point of view) are presented in this paper. Concretely, follow-on experimental results on the residual stress profiles and associated surface properties modification successfully reached in typical materials (especially Al and Ti alloys characteristic of high reliability components in the aerospace, nuclear and biomedical sectors) under different LSP irradiation conditions are presented along with a practical correlated analysis on the protective character of the residual stress profiles obtained under different irradiation strategies. Additional remarks on the improved character of the LSP technique over the traditional “shot peening” technique in what concerns depth of induced compressive residual stresses fields are also made through the paper.

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A. Gil-Santos

Papers

Effect of advancing direction on fatigue life of 316L stainless steel specimens treated by double-sided laser shock peening

Eigenstrain simulation of residual stresses induced by laser shock processing in a Ti6Al4V hip replacement

Laser Shock Processing: an emerging technique for the enhancement of surface properties and fatigue life of high-strength metal alloys

Induction of engineered residual stresses fields and enhancement of fatigue life of high reliability metallic components by laser shock processing