Journal ArticleDOI
Laser-shock processing effects on surface microstructure and mechanical properties of low carbon steel
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TLDR
In this article, the effects of laser-shock processing on the microstructure, microhardness, and residual stress of low carbon steel were studied using a Nd:glass phosphate laser.Abstract:
The effects of laser-shock processing (LSP) on the microstructure, microhardness, and residual stress of low carbon steel were studied. Laser-shock processing was performed using a Nd:glass phosphate laser with≈600 ps pulse width and up to 120 J pulse energy at power densities above 10 12 W cm −2 . The effects of shot peening were also studied for comparison. Laser-shock induced plastic deformation caused the surface to be recessed by≈1.5 μm and resulted in extensive formation of dislocations. Surface hardness increased by up to 80% after the LSP. The microstructure and mechanical properties were altered up to≈100 μm in depth. The LSP strengthening effect on low carbon steel was attributed to the presence of a high dislocation density. Shot peening resulted in a relatively higher compressive residual stress throughout the specimen than did LSP.read more
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Laser Material Processing
TL;DR: In this paper, the effect of reflectivity of the surface, when a pure, monochromatic laser (6) is used, is remedied by the simultaneous application of a relatively shorter wavelength beam (1).
Journal ArticleDOI
Grain refinement mechanism of multiple laser shock processing impacts on ANSI 304 stainless steel
Jin Zhon Lu,Kaiyu Luo,Yong Kang Zhang,Sun Guifang,Y.Y. Gu,Jianzhong Zhou,Xu Dong Ren,Xian-Cheng Zhang,Ling Feng Zhang,K.M. Chen,C.Y. Cui,Y.F. Jiang,A.X. Feng,Lai-Chang Zhang +13 more
TL;DR: In this article, the micro-structural evolution and grain refinement in ANSI 304 stainless steel subjected to multiple laser shock processing (LSP) impacts were investigated by means of cross-sectional optical microscopy and transmission electron microscopy observations.
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
Microstructural response and grain refinement mechanism of commercially pure titanium subjected to multiple laser shock peening impacts
TL;DR: In this article, the microstructural response and grain subdivision process in commercially pure (CP) titanium subjected to multiple laser shock peening (LSP) impacts were investigated by means of optical microscopy (OM), scanning electron microscopy and transmission electron microscope (TEM) observations.
Journal ArticleDOI
Microstructure, residual stress and tensile properties control of wire-arc additive manufactured 2319 aluminum alloy with laser shock peening
Rujian Sun,Liuhe Li,Ying Zhu,Wei Guo,Peng Peng,Baoqiang Cong,Jianfei Sun,Zhigang Che,Bo Li,Chao Guo,Lei Liu +10 more
TL;DR: In this paper, laser shock peening was combined with wire-arc additive manufacturing to refine microstructure, modify stress state and enhance tensile properties of as-printed 2319 aluminum alloy.
References
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Electron Microscopy of Thin Crystals
TL;DR: Hirsch et al. as mentioned in this paper described further experiments on the preparation of thin film sections of embedded Backscatter Kikuchi diffraction in the SEM for identification of crystallographic thin films by electron microscopy.
Journal ArticleDOI
Physical study of laser-produced plasma in confined geometry
TL;DR: In this article, the authors studied the physical processes involved in laser-produced plasma in confined geometry, and showed that a large fraction of the absorbed laser energy (80% to 90%) is used for the ionization of the medium in these conditions of irradiation.
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TL;DR: Körber as mentioned in this paper presented a quantitative analysis of the distribution of stress in the transition zone between the rolls and the stock being rolled, based on the results of determinations along the roll-gap of the pressure created at the surface of contact between the tool and the material.
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Vander Voort,F George +1 more
TL;DR: A comprehensive source of information on metallographic techniques and their application to the study of metals, ceramics and polymers, this work is thoroughly referenced and well-illustrated with an extensive collection of micrographs and macrographs as discussed by the authors.