Relationship between surface residual stress and dislocation configuration after laser shock processing of TC4 titanium alloy

Ge, Liang; Chen, Haotian; Tian, Zongjun; Xu, Boyuan

doi:10.1016/j.optlastec.2022.108702

Cited by 5 publications

(3 citation statements)

References 21 publications

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“…The only change on each surface is porosity. Such imperfections as cracks, previously observed after laser irradiation [ 34 , 35 ], do not appear. This may be evidence of the presence of compressive stresses within the thin subsurface layer [ 36 , 37 ] and the absence of a brittle zone in which tensile residual stresses might occur [ 20 ].…”

Section: Resultsmentioning

confidence: 80%

Mechanical Properties and Wear Susceptibility Determined by Nanoindentation Technique of Ti13Nb13Zr Titanium Alloy after “Direct Laser Writing”

et al. 2023

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Laser treatment has often been applied to rebuild the surface layer of titanium and its alloys destined for long-term implants. Such treatment has always been associated with forming melted and re-solidified thin surface layers. The process parameters of such laser treatment can be different, including the patterning of a surface by so-called direct writing. In this research, pulse laser treatment was performed on the Ti13Nb13Zr alloy surface, with the distance between adjacent laser paths ranging between 20 and 50 µm. The obtained periodic structures were tested to examine the effects of the scan distance on the microstructure using SEM, the roughness and chemical and phase composition using EDS and XRD, and the mechanical properties using the nanoindentation technique. After direct laser writing, the thickness of the melted layers was between 547 and 123 µm, and the surface roughness varied between 1.74 and 0.69 µm. An increase in hardness was observed after laser treatment. The highest hardness, 5.44 GPa, was obtained for the sample modified with a laser beam spacing of 50 µm. The value of the distance has been shown to be important for several properties and related to a complex microstructure of the thin surface layer close to and far from the laser path.

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Section: Resultsmentioning

confidence: 80%

Mechanical Properties and Wear Susceptibility Determined by Nanoindentation Technique of Ti13Nb13Zr Titanium Alloy after “Direct Laser Writing”

et al. 2023

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“…When increasing the laser energy from 6 to 8 J, the compressive residual stresses increased from 450 to 510 MPa and the affected depth from 500 to 600 µm. In a similar laser treatment [41], a compressive stress field was evident throughout the sample thickness at both locations, decreasing from a peak compression of 600 to 800 MPa at the surface to a minimum compressive stress of 200 MPa at the interior [31]. When increasing the laser power, a rapid increase followed by the decrease in residual compressive stress could be observed.…”

Section: Mechanical Propertiesmentioning

confidence: 86%

“…Numerous short cracks in the surface layer appeared within the very thin subsurface layer. Such cracks are not often reported [31,32] as they are prevented by compressive stresses [33,34]. In [15], the formation of the cracks was attributed to the semi-brittle layer, which experienced high lateral tensile residual stresses.…”

Section: Surface Topography and Compositionmentioning

confidence: 96%

Effect of Laser Treatment on Intrinsic Mechanical Stresses in Titanium and Some of Its Alloys

et al. 2023

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Laser surface treatment conducted at different power levels is an option to modify titanium bone implants to produce nano- and microtopography. However, such processing can lead to excess mechanical stress within the surface layer. This research aims to calculate the level of such residual stresses after the surface processing of Ti grade IV, Ti15Mo, and Ti6Al7Nb alloys with an Nd:YAG laser. Light and scanning electron microscopies (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffractometry (XRD), optical profilography, and nano-indentation tests were applied to characterize the surface zone. The laser processing resulted in a distinct surface pattern and the formation of remelted zones 66–126 µm thick, with roughness values ranging between 0.22 and 1.68 µm. The mechanical properties were weakly dependent on the material composition. The residual stresses caused by the laser treatment were moderate, always tensile, increasing with loading, and was the highest for the Ti15Mo alloy.

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Numerical and Experimental Study on the Fatigue Behavior of X80 Steel Treated by Biomimetic Laser Shock Peening

Shang,

Duan,

Luo

et al. 2023

J. of Materi Eng and Perform

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Relationship between surface residual stress and dislocation configuration after laser shock processing of TC4 titanium alloy

Cited by 5 publications

References 21 publications

Mechanical Properties and Wear Susceptibility Determined by Nanoindentation Technique of Ti13Nb13Zr Titanium Alloy after “Direct Laser Writing”

Mechanical Properties and Wear Susceptibility Determined by Nanoindentation Technique of Ti13Nb13Zr Titanium Alloy after “Direct Laser Writing”

Effect of Laser Treatment on Intrinsic Mechanical Stresses in Titanium and Some of Its Alloys

Numerical and Experimental Study on the Fatigue Behavior of X80 Steel Treated by Biomimetic Laser Shock Peening

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