A mechanical model for the quantification of the

The technology of laser quenching is widely used to improve the surface properties of steels in surface engineering.Generally,laser quenching of steels can lead to two important results.One is the generation of residual stress in the surface layer.In general,the residual stress varies from the surface to the interior along the quenched track depth direction,and the residual stress (PDF) Advances in Laser Heat Treatment of Ferrous Alloys Academia.edu is a platform for academics to share research papers.Author Natarajan Jeyaprakash,Che-Hua Yang,Durairaj Raj KumarPublish Year 2020Experimental study of magnetic quenching of laser A magnetic quenching of generation in a chemical oxygen-iodine laser (COIL) has been studied experimentally.This work gives data on a quenching threshold magnetic field in dependence on a resonator output coupling and an iodine concentration in the laser active zone,respectively.It was found that the threshold value of magnetic field was a decreasing function of the output coupling and an

Cited by 24Publish Year 1999Author Liu Qingbin,Liu Hong PROCESS PARSYMBOL AND UPARAMETER LPARAMETER LE Parameter level -- 1 2 4 Surface condition Black organic coWhite absorbent Carbon ink coating Laser power P (W) 1100 1200 1400 Traverse speed V (mm s 1) 20 25 6 rows on sciencedirectExperimental study of the laser quenching of 40CrNiMoA

Laser surface quenching is a new candidate technique.In this study,based on orthogonal experimental design,the effect of the surface condition,the laser power,the traverse speed,the incident angle and the gas flow rate on the quenched zone of 40CrNiMoA steel was investigated systematically.Cited by 24Publish Year 1999Author Liu Qingbin,Liu HongEffects of Laser Quenching on Impact Toughness and Jul 23,2014·The laser quenching research on 40CrNiMo steel has mainly concentrated on fatigue resistance,thermal deformation,microstructures of low temperature impact,etc.(Ref 7-10),and the impact toughness investigation of 40CrNiMo by laser quenching with liquid nitrogen cooling has not been reported.The Charpy U type notch was prepared on the middle of 40CrNiMo sample,theCited by 4Publish Year 2010Author Sheng Lei,Quankun Liu,Yuping Ma,Jingming RenExperimental study of magnetic quenching of laser May 04,1993·A magnetic quenching of generation in a chemical oxygen-iodine laser (COIL) has been studied experimentally.This work gives experimental data on a quenching threshold magnetic field in dependence on a resonator output coupling and an iodine concentration in the laser

Cited by 8Publish Year 2014Author Kong Dejun,Zhang LeiEstimated Reading Time 3 minsOptimization Based on Orthogonal Experiment Design and

·Translate this pageExperimental study of the laser quenching of 40CrNiMoA steel. Laser surface quenching is a new candidate technique. the incident angle and the gas flow rate on the quenched zone of Enhancement and quenching of single-molecule fluorescenceWe present an experimental and theoretical study of the fluorescence rate of a single molecule as a function of its distance to a laser-irradiated gold nanoparticle.The local field enhancement leads to an increased excitation rate whereas nonradiative energy transfer to the particle leads to a decrease of the quantum yield (quenching).Experimental and Computational Study of the Quenching of Aug 01,1997·The model was simulated using the finite element method (FEM).An experimental study of the quenching of 1080 steel cylinders in water and two types of polymeric quenchants has also been carried out.The temperatures at three points within the cylinder during quenching

Experimental demonstration of photon upconversion via

Mar 15,2017·Experimental work in the 1990s by Nickoleit et al.16 demonstrated CEP-like energy-upconversion photoisomerization,but the authors were unable to verify the exact mechanism and concluded that it Experimental study of laser heat-treated bearing steel Abstract This work deals with the microstructural features,hardness,case depth,and wear characteristics of laser heat-treated 52100 bearing steel.For this purpose,the steel samples were laser transformation hardened at two scan speeds and were examined and tested for the above characteristics.The results were compared to conventionally quenched and tempered 52100 bearing steel.Experimental study on the warm forming and quenching Experimental study on the warm forming and quenching behavior for hot stamping of high-strength aluminum alloys.J Degner 1,A Horn 1 and M Merklein 1.Published 1 September 2017 Published under licence by IOP Publishing Ltd

First self-cooling fiber laser made with silica Stanford

Mar 16,2021·Stanford researchers and a team of collaborators develop the first self-cooling optical fiber made of silica for laser applications and have quickly developed it into a laser amplifier a Fluorescence Quenching - UZHPhysikalisch-chemisches Praktikum I Fluorescence Quenching { 2016 is a very important step in many photocatalytic reactions,for example for solar fuel production.[2] Heavy elements can also quench uorescence by strongly enhancing the rate of in-tersystem crossing (i.e.the change from triplet to singlet states or vice versa) and thisLaser Surface Modification of Materials IntechOpenOct 31,2020·The wear and microhardness studies are performed on 40CrNiMoA steel by using laser quenching and high-frequency quenching.A 2 kW CW CO 2 laser,1400 W laser power,35 mm/s traverse speed,60 degree incident angle,black organic absorbent coating,0.9 m 3 /h gas flow rate and 10 mm defocusing distance are used in the laser treatment.The hardness of the quenched groove surface reached 750 HV and is substantially higher than that resulting from the high-frequency quenching

Laser flash photolysis study of the photoinduced oxidation

·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 ofLasersurface quenchingis a new candidate technique.In this study,based on orthogonal experimentaldesign,the effect of the surface condition,the laser power,the traverse speed,the incident angle and the gas flow rate on the quenched zone of 40CrNiMoAsteel was investigated systematically.Author:Liu Qingbin,Liu HongCited by:24Publish Year:1999Experimental study of the laser quenching of 40CrNiMoA Was this helpful?Experimental study of the laser quenching of 40CrNiMoA 6 rows·Apr 15,1999·A 2-KW high-power CO 2 laser has been used for the present study into laser quenching of NSF Award Search Award # 1436775 - Laser Processing Technical objectives of the research include experimental examination of laser-induced material modification and atomistic modeling of laser interactions with silicon substrate; control of defects through optimization of laser processing parameters such as laser beam profile,laser power,and laser repetition rate; and understanding the effect

Numerical Investigation of Laser-Induced Ignition

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 OSA Experimental comparison of silica fibers for laser Laser cooling in silica has recently been demonstrated,but there is still a lack of understanding on how fiber composition,core size,and OH contamination influence cooling performance.In this work,six Yb-doped silica fibers were studied to illuminate the influence of these parameters.The best fiber cooled by 70mK with only 170 mW/m of absorbed pump power at 1040 nm,which Optimization of quenching parameters for ultra high Optimization of quenching parameters for ultra high strength steel using response surface method May 2013 Chongqing Daxue Xuebao/Journal of Chongqing University 36(5):37-43

Quenching of the Singlet and Triplet Excited States of

Steady-state and time-resolved fluorescence measurements and laser flash photolysis experiments were performed to investigate the quenching of the Ptr excited states by the amino acids in aqueous solution.The singlet excited states of Ptr are quenched by Met mainly via a dynamic process and by Trp via a combination of dynamic and static processes.Reactive quenching of OH A 2+ by O2 and COSep 07,2012·Reactive quenching of OH A 2+ by O2 and CO experimental and nonadiabatic theoretical studies of H- and O-atom product channels.Lehman JH(1),Lester MI,Yarkony DR.Author information (1)Department of Chemistry,University of Pennsylvania,Philadelphia,Pennsylvania 19104Related searches for experimental study of the laser quenclaser hardeninglaser hardening steellaser hardening serviceslaser surface hardening1538 mv steelSome results are removed in response to a notice of local law requirement.For more information,please see here.12345Next

Systematic study of defect-related quenching of NV

Oct 02,2013·We report on the systematic characterization of photoluminescence (PL) lifetimes in NV${}^{\ensuremath{-}}$ and NV${}^{0}$ centers in 2-MeV H${}^{+}$-implanted type Ib diamond samples by means of a time-correlated single-photon counting (TCSPC) microscopy technique.A dipole-dipole resonant energy transfer model was applied to interpret the experimental results,allowing aThank you - Journal of Laser ApplicationsAug 08,2017·The 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.The effect of the laser spots overlap on the structure [6] L.Qingbin,L.Hong,Experimental study of the laser quenching of 40CrNiMoA steel,Journal of Materials Processing Technology 88 (1999) 77-82.[7] Ch.Yao,B.Xu,J.Huang,P.Zhang,Y.Wu,Study of the softening in overlapping zone by laser-overlapping scanning surface hardening for carbon and alloyed steel,Optics and Lasers in Engineering 48/1 (2010) 20-26.

Time Resolved Pulsed Laser Photolysis Study of Pyrene

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 isUltrafast dynamics observation during femtosecond laser Sep 20,2019·In addition to the studies on femtosecond two-pulse ablation,recent studies have proposed that the morphology of the laser-induced crater roughens as the pulse number (N) increases [4750].This phenomenon leads to a loss of laser-refocusing ability,and it can considerably alter the nature of expansion of the plasma and shockwave.Wear performance of laser surface hardened GCr15 steel Feb 06,2010·Experimental Study of the Laser Quenching of 40CrNiMoA Steel[J] Liu,Q.B.Prediction of as-quenched Hardness After Rapid Austenitization and

Wear performance of laser surface hardened GCr15 steel

Feb 06,2010·R Komanduri Z.Thermal Analysis of the Laser Surface Transformation Hardening Process[J].International Journal of Heat and Mass Transfer,2001 (44) 2 8452 862.Article CAS Google Scholar [3] Q B Liu.Experimental Study of the Laser Quenching of 40CrNiMoA Steel[J].