preloader

study on the softening in overlapping zone by laser

study on the softening in overlapping zone by laser

If you have any needs, please send an email to [email protected], or communicate with us online to get a quick quote


If you have any needs, please send an email to [email protected], or communicate with us online to get a quick quote


(PDF) Effect of Laser Surface Hardening on the

Laser hardening surface treatment can decrease the friction coefficient to improve the wear resistance of steel surface.Softening in overlapping passes by laser-overlapped scanning surface12345NextInfluence of overlapping ratio on hardness and residual Laser surface melting (LSM) has its advantages over the conventional surface processes,including minimum distortion,high hardness and narrow heat-affected zone.Temper softening in overlapping tracks is an important problem to be solved in multi-track LSM large components.

A study on the CO2 laser welding characteristics of high

The HAZ softening that occurs in butt joint welding can reduce the tensile shear strength for overlap joint welds,which are predominantly mostly used in the BIW (body-in-white) structure.Originality/value This paper quantitatively demonstrates the occurrence of HAZ softening and a tensile strength reduction in laser welding of automotive steel with 780 MPa strength and more.All you need to know about the heat-affected zoneLaser cutting generates the smallest HAZ among all thermal cutting techniques because it applies heat on a very small area.Plasma cutting generates an intermediate HAZ because the plasma pulse is wider than a laser beam.Higher currents allow for a higher cutting speed,reducing the duration of exposure and the width of the HAZ.An experimentally based thermo-kinetic phase Mar 25,2012·However,a tempered zone is formed in overlapping regions of a large heat-treated area during multi-pass laser heat treatment (MPLHT) that affects the uniformity of heat-treated depth of material.This study is focused on the development of a uniform hardness distribution model to minimize the tempering effect during the MPLHT process.

Analytical modeling of cutting forces considering material

AerMet100 steel is a typical difficult-to-cut material,and laser-assisted milling (LAM) is a promising machining technology for this kind of material.In LAM process,the material is softened by the thermal effect of laser beam,which improves the machinability of the materials.And finally,the cutting forces are reduced compared with conventional milling (CM).Characterization of lap joints laser beam welding of thin Lap joints obtained by overlapping two plates are widely diffused in aerospace industry.Nevertheless,because of natural aging,adhesively bonded and riveted aircraft lap joints may be affected by cracks from rivets,voids or corrosion.Friction stir welding has been proposed as a valid alternative,although large heat affected zones are produced both in the top and the bottom plate due to Cited by 22Publish Year 2010Author Chaowen Li,Yong Wang,Zhe Zhang,Bin Han,Tao Han(PDF) Effect of Laser Surface Hardening on the Despite the advantage of laser quenching,softening in overlapping zone limits its practical application.In this paper,45,9Cr2Mo and W18Cr4V steel were hardened by laser-overlapping quenching

Cited by 26Publish Year 2010Author Chengwu Yao,Binshi Xu,Jian Huang,Peilei Zhang,Yixiong WuInfluence of overlapping ratio on hardness and residual

Dec 01,2010·Abstract.Laser surface melting (LSM) has its advantages over the conventional surface processes,including minimum distortion,high hardness and narrow heat-affected zone.Temper softening in overlapping tracks is an important problem to be solved in multi-track LSM large components.In this work,a numerical model is presented in order to study the influence of overlappingCited by 26Publish Year 2010Author Chengwu Yao,Binshi Xu,Jian Huang,Peilei Zhang,Yixiong WuStudy on the softening in overlapping zone by laser Despite the advantage of laser quenching,softening in overlapping zone limits its practical application.In this paper,45,9Cr2Mo and W18Cr4V steel were hardened by laser-overlapping quenching Cited by 26Publish Year 2010Author Chengwu Yao,Binshi Xu,Jian Huang,Peilei Zhang,Yixiong WuStudy on the softening in overlapping zone by laser Jan 01,2010·In previous quenching pass,a tempering zone with lower hardness was formed.For the practical application of large areas laser quenching,softening in overlapping zone is a problem that has to be solved.Recently,Tani et al.,presents an original tempering model for the prediction of the hardness reduction in multiple laser paths.The re-austenitization of the martensite and the non

Comparative Study on Welding Characteristics of Laser

The width of the partially melted zone of the laser-CMT hybrid weld was narrower than that in the plasma-CMT hybrid weld.Micro-hardness test results show that two distinct softening regions were identified in the heat affected zone,and the micro-hardness values of each zone in the laser-CMT hybrid weld were lower than that in the plasma-CMT hybrid weld.Corrosion behavior of laser hardened 50CrMo4 (AISI 4150 Nov 15,2019·A detailed study on scan overlapping and its effect on surface hardness can be found elsewhere [22,23].We also notice a clear demarcation between the laser-affected zone and the base microstructure (marked with white lines in Fig.6a) which indicates the boundary between the austenitized region and the bulk microstructure .Effect of Thermal Softening on Anisotropy and DuctileThe effect of thermal softening on cuts is studied by analyzing the image of cuts and verifying the depth of cuts which were made by using varying thrust load and laser power.Macroscopic plastic deformation (chips and surface) occurring under high contract pressures and high temperatures is presented.

Effect of Thermal Softening on Anisotropy and Ductile

The effect of thermal softening on cuts is studied by analyzing the image of cuts and verifying the depth of cuts which were made by using varying thrust load and laser power.Macroscopic plastic deformation (chips and surface) occurring under high contract pressures and high temperatures is presented.Effect of Welding Processes on Mechanical and Arc welding processes are widely used in the automotive industry among other welding processes.Consequently,laser welding technology is being used instead of arc welding due to the rapid heating and cooling characteristics of the laser.In this study,empirical investigations and comparative study are held out on the arc and laser beam welded joints of DP780 dual-phase steel.Effects of Overlapping Distances on Steel Microstructure In this study,multi-track laser quenching with different overlapping distances was used to assess SM45C microstructure and properties.Two overlapping distance types were evaluated,including overlapping distances in the transition and martensite regions,respectively.After multi-track quenching,hardness showed a threefold increase.

Effects of Overlapping Distances on Steel Microstructure

In this study,multi-track laser quenching with different overlapping distances was used to assess SM45C microstructure and properties.Two overlapping distance types were evaluated,including overlapping distances in the transition and martensite regions,respectively.After multi-track quenching,hardness showed a threefold increase.Influence of overlapping ratio on hardness and residual Despite the advantage of laser quenching,softening in overlapping zone limits its practical application.In this paper,45,9Cr2Mo and W18Cr4V steel were hardened by laser-overlapping quenching Influence of post-heat treatments on the mechanical Mar 18,2020·Yao C,Xu B,Huang J et al (2010) Study on the softening in overlapping zone by laser-overlapping scanning surface hardening for carbon and alloyed steel.Opt Lasers Eng 48:2026.https://doi/10.1016/j.optlaseng.2009.05.001.Article Google Scholar

Laser Hardening - an overview ScienceDirect Topics

The hardening occurred due to plastic deformation and the softening occurred because of recovery and recrystallization accompanying each laser scan.METHOD OF WELDING OVERLAPPED PORTION,METHOD OF In other words,after resistance spot welding is applied,a laser beam is emitted onto the overlapped portion to form the melted and solidified portion so as to extend across the HAZ softening zone formed around the nugget,thereby hardening the HAZ softening zone.Microstructural Characterization of Surface Softening The surface hardening and softening behavior of two types of medium carbon martensitic steel (AISI P20-improved and AISI P21) after laser-assisted heat treatment was quantitatively compared.The

Numerical modeling and experimental study of thermally

The direct diode laser application has been found useful in the localized heat treatment of metal parts because of its wider beam and more uniform energy distribution with respect to other lasers with Gaussian-like energy distribution.In this study,an uncoupled thermomechanical finite element model is developed to study the temperature field and thermally induced stress evolution in high Phonon softening and crystallographic orientation of May 05,2009·Fig.1.Strain-induced phonon softening in graphene.(A,B) Evolution of the spectra of the 2D (A) and G (B) bands of graphene under strain.The spectra of the 2D band and the first 2 spectra of the G band are fit by single Lorentz peaks; the other G band spectra are fit by 2 Lorentz peaks of fixed width 16 cm 1 (smooth overlapping curves),as extracted from the polarization study shown Prediction of hypo eutectoid steel softening due to Despite the advantage of laser quenching,softening in overlapping zone limits its practical application.In this paper,45,9Cr2Mo and W18Cr4V steel were hardened by laser-overlapping quenching

Previous123456NextStudy on softening behavior of laser welded joint in

Nov 21,2017·Laser beam welding was conducted on GH909 alloy in a solution treatment and aging conditions.The microstructure,mechanical properties,and softening behavior of welded joints were carefully studied using scanning electron microscopy,energy diffraction spectroscopy,and other techniques.Results indicated that -Ni3(TiAl)-precipitated phases were produced inside the matrix,Publications Data Integrated Computational Materials [ Dissertations and theses ] Yi Li,Oxidation Behavior and Thermal Conductivity of Thermoelectric SnSe as well as Laser Powder Bed Fusion Process Modeling and Validation through In-situ Monitoring and Ex-situ Characterization,Ph.D.Dissertation,The Ohio State University,2019.Hyeyun Song,Multi-scale Microstructure Characterization for Improved Understanding of Microstructure-Property Softening Kinetics in the Subcritical Heat-Affected Zone 2 laser (operated at 80 pct power) in the case of the DP600s and a 1-kW Yb ber laser in the case of the DP780s.The characteristics of all of the lasers may be found in Table II.C.Measuring Welding Heat Input Although three lasers were used to create the welds used in this study,the softening

Softening LASERLINE

Softening is a process step for the transformation of steel components.At the softening process,the martensite formation hardened steel will be heated in predefined areas.Thereby,the steel microstructure is changed; depending on the temperature,the martensite is either annealed (softened) or transformed into a more flexible ferrite Softening in overlapping passes by laser-overlapped scanning surface hardening is a difficult problem of laser surface modification.Despite the advantage of laser quenching,softening in overlapping zone limits its practical application.In this paper,45,9Cr2Mo and W18Cr4V steel were hardened by laser-overlapping quenching.Author:Chengwu Yao,Binshi Xu,Jian Huang,Peilei Zhang,Yixiong WuCited by:26Publish Year:2010Study on the softening in overlapping zone by laser Was this helpful?Study on the softening in overlapping zone by laser Abstract.Softening in overlapping passes by laser-overlapped scanning surface hardening is a difficult problem of laser surface modification.Despite the advantage of laser quenching,softening in overlapping zone limits its practical application.In this paper,45,9Cr2Mo and W18Cr4V steel were hardened by laser-overlapping quenching.Softening the Presbyopic Lens With a Femtosecond Laser The first clinical trial using the laser for lens softening was performed in 2011 by cataract and refractive surgeon Harvey Uy,MD,of Makati City,Philippines.This feasibility study was performed in 80 eyes of patients one month prior to their scheduled cataract surgery.The pulse energy in the study was approximately 10 microjoules (J).

Study of die break strength and heat-affected zone for

Apr 13,2015·Simulations suggest that the thickest heat-affected zone section during laser scribing is typically located at the boundary of the laser incident surface.Simulation results also show that for a given repetition rate the heat-affected zone becomes larger as the net fluence increases due to smaller interpulse separation,consistent with the experimental observation.Study of issues in difficult-to-weld thick materials by The weld was fractured in the heat affected zone of the aluminum side in the tensile test.The microharness was shown that the temperature variation caused minor softening in the heat affected zone satisfying the requirement that the width of the softened heat affected zone in the steel side falls within 15.9 mm far away from the weld centerline.Study on the softening in overlapping zone by laser Jan 01,2010·Softening in overlapping passes by laser-overlapped scanning surface hardening is a difficult problem of laser surface modification.Despite the advantage of laser quenching,softening in overlapping zone limits its practical application.In this paper,45,9Cr2Mo and W18Cr4V steel were hardened by laser-overlapping quenching.

The effect of the laser spots overlap on the structure

Design/methodology/approach The effect of laser spots overlap was investigated on tool steels.The material was quenched by a Nd:YAG laser Laserline LDF 4000 with a maximal power of 4 kV.The laser set was supplemented by an industrial robot.Findings The laser quenching is the unconventional method of heat treatment.Thermomechanical and Metallurgical Study of Laser-Welded Therefore,the aim of this study was to weld 12 coupons by laser beam of AISI 1018 steel of 8 and 16 mm thickness to analyze the mechanical and microstructural properties.The formation of a softening zone in heat-affected zone was determined.The softening zone caused cracking inThermomechanical laser welding simulation of dissimilar Laser-welded austenitic steel 304 - 6082 Al alloy overlap joints are considered. The softening of the alloys in the heat-affected zone was determined by physical simulations and considered as a function of maximum temperature.Computed and measured distortions showed good agreement for various welding regimes with an average deviation of 18.4%.


If you have any needs, please send an email to [email protected], or communicate with us online to get a quick quote

Post your Inquire

Recent post