Feb 15, 2020 · Explanations of possible quenching of the flame kernel will be sought. The problems addressed include numerical simulations of the laser-induced shock wave propagation, the transition of the laser-spark to a self-sustained flame with the help of chemical reactions, and the quenching of lean biogas flames. The shock wave study is found to accord "Numerical Investigation of Laser-Induced Ignition Feb 15, 2020 · Explanations of possible quenching of the flame kernel will be sought. The problems addressed include numerical simulations of the laser-induced shock wave propagation, the transition of the laser-spark to a self-sustained flame with the help of chemical reactions, and the quenching of lean biogas flames. The shock wave study is found to accord
With the rapid development of rail transit, the wear problem of track has become a serious challenge. Laser quenching is a new surface modification process, and it is expected to improve the service life of the track. Laser quenching was carried on the surface of rails by using 6kW fiber laser. The microstructure, hardness, wear resistance, and contact fatigue resistance (CFR) of the phase Effect of wear-resistant coatings on the comprehensive The friction coefficient of the 40CrNiMoA substrate was 0.65, while the friction coefficients of WC, Cr 3 C 2, and PTFE coatings were 0.22, 0.27, and 0.13, respectively, corresponding to 33.8%, 41.5%, and 20% of the friction coefficient of the 40CrNiMoA substrate. The friction coefficient of the PTFE coating was the lowest due to its self Experimental Evaluation of the Quench Rate of AA7075The water-cooled plate and the bead die are laboratory-scale experimental setups designed to replicate the hot stamping/die quenching process. The results verify that water is the most superior form of quenching, i.e. above 1000°C/s, the bead die quench rate is impressive at 525°C/s, and the water-cooled plate quench rate is marginal at 34°C/s.
Aromatic amines are aquatic contaminants for which phototransformation in surface waters can be induced by excited triplet states of dissolved organic matter (3DOM*). The first reaction step is assumed to consist of a one-electron oxidation process of the amine to produce its radical cation. In this paper, w Laser quenching of plasma nitrided 30CrMnSiA steel Jun 01, 2014 · Laser quenching is one of the most promising techniques to obtain a hardened layer with sufficient thickness, ideal fatigue and wear resistance , . Lee et al. produced a laser quenching layer near to 220 m with an average hardness of 480500 HV 0.05 on AISI H13 steel. That is, the laser quenching is effective in obtaining a thick hardened Laser-Induced Fluorescence (LIF)Laser-Induced Fluorescence (LIF) Fluorescent dyes (molecules) can absorb light at one frequency and subsequently re-emit (fluoresce) light at a different frequency. In experiments, the dyes are excited by laser light whose frequency closely matches the excitation frequency of the dye. For
Apr 01, 2018 · The hardness layer of 40CrNiMoA steels can be much deeper than that produced by simple nitriding after a combination of laser quenching and gas nitriding treatments, as evidenced by Xi et al. . Kulka and Collmbin et al. [ 10 , 11 ] found that laser-treated nitride layers (with or without re-melting) feature improved wear resistance compared to New optical method paves way to breath test for cancer Nov 16, 2020 · For the new optical fringe quenching technique, the researchers slightly change, or modulate, the emission of the laser over a range of wavelengths Study of anti-laser irradiation performance of shot-peened In this paper, shot-peening treatment was introduced to reinforce an alloy surface to protect it from laser irradiation, and experiments were carried out on 40CrNiMoA alloy steel. Macro-mechanical properties were studied and compared before and after both shot-peening and laser irradiation by conducting tensile and hardness measurements.
Keywords:laser quenching, laser spots overlap, microstructure, 1.1191 steel 1. INTRODUCTION Laser technologies are very productive and economical and moreover, they are often one of the few alternatives for the production of a particular part. One of the major areas of application of lasers is the surface quenching of material. THE EFFECT OF THE LASER SPOTS OVERLAP ON THE Keywords:laser quenching, laser spots overlap, microstructure, 1.1191 steel 1. INTRODUCTION Laser technologies are very productive and economical and moreover, they are often one of the few alternatives for the production of a particular part. One of the major areas of application of lasers is the surface quenching of material. Thank you - Laser Institute of AmericaThe authors report the fabrication of a particulate-reinforced composite layer on compacted graphite cast iron by means of selective laser alloying, reinforced with ZrO 2 ceramic particulates. The scanning strategy was inspired by the alternate arrangement of aragonite and organic layers on the shell surface.
Experimental This experimental is fully detailed in the Chem 457 laboratory manual.2 First, the laser photolysis apparatus is assembled as shown in Figure 2. The laser is that of a pulsed nitrogen laser set to emit an ultraviolet wavelength of 337.1 nm at a quartz sample cell. The wavelength is Zhanwei Liu_Mechanics_Beijing Institute of TechnologyResearch Interests (1)Advanced optical measurement techniques in Experimental Mechanics and NDT field; (2) Experimental Study on mechanics of advanced materials andmicrostructures. et al., Study of anti-laser irradiation performance of shot-peened 40CrNiMoA alloy steel, Materials Science & Engineering A, 558(15):675683; 2012 Journal of Materials Processing Technology Vol 88 Experimental study of the laser quenching of 40CrNiMoA steel. Liu Qingbin, Liu Hong. Pages 77-82 Download PDF. Article preview. Experimental and theoretical analysis of deformation and microstructural evolution in the hot-die forging of titanium alloy aerofoil sections.