Numerical Simulation of Temperature Field and Stress Field to Multiple Laser Cladding Co Coatings

Lin, Donghai; Li, Ming Xi; Huang, Dao Ye; Jang, Hong Yun

doi:10.4028/www.scientific.net/amm.456.382

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…In the LMD process, there is a solid phase to liquid phase to solid phase transition, during which the material will continue to absorb or release a large amount of heat called phase transition latent heat. Therefore, the latent heat of the phase transition must be considered when establishing the finite element model [ 39 ]. The method of dealing with latent heat in ABAQUS (2017, SIMULIA, Johnston, RI, USA) is the enthalpy method—that is, the method of enthalpy varying with temperature is used to define latent heat, and its expression is as follows:

where

is enthalpy,

is density, and

is the specific heat capacity.…”

Section: Finite Element Modelmentioning

confidence: 99%

Numerical Simulation and Experimental Study on Residual Stress in the Curved Surface Forming of 12CrNi2 Alloy Steel by Laser Melting Deposition

Cui

Dong³

et al. 2020

Materials

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The performance and service life of the nuclear emergency diesel engine shaft made of 12CrNi2 alloy steel is very important for the safety of nuclear power. Laser melting deposition (LMD) is a challenging camshaft-forming technology due to its high precision, rapid prototyping, and excellent parts performance. However, LMD is an unsteady process under the local action of laser, especially for curved surface forming, which is more likely to generate large residual stress on components, resulting in cracks and other defects. At present, the stress research on LMD curved surface forming is relatively insufficient. In the present paper, material parameter testing, high-temperature mechanical properties analysis, single-track sample preparation, and heat source checks are conducted. At the same time, the ABAQUS software and the DFLUX heat source subroutine are used to compile the curved double-ellipsoidal moving heat source, and the effects of the temperature-dependent thermophysical parameters and phase change latent heat on the temperature field are considered. A three-dimensional finite element model is established to analyze the thermal stress evolution and residual stress distribution of multi-track multi-layer on a curved surface by LMD, and the effect of the scanning method and interlayer cooling time on the residual stress of the formed components is studied. The results show that with the increase in temperature, the strength of the material reduces, and the fracture morphology of the material gradually transitions from ductile fracture to creep fracture. The material parameters provide a guarantee for the simulation, and the errors of the width and depth of the melt pool are 4% and 9.6%, respectively. The simulation and experiment fit well. After cooling, the maximum equivalent stress is 686 MPa, which appears at the junction of the substrate and the deposited layer. The larger residual stress is mainly concentrated in the lower part of the deposited layer, where the maximum circumferential stress and axial stress are the tensile stress. Compared with the axial parallel lap scanning method, the arc copying lap scanning method has a relatively smaller maximum thermal stress and residual stress after cooling. The residual stress in the deposited layer is increased to some extent with the increase in the interlayer cooling time.

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where

is enthalpy,

is density, and

is the specific heat capacity.…”

Section: Finite Element Modelmentioning

confidence: 99%

Numerical Simulation and Experimental Study on Residual Stress in the Curved Surface Forming of 12CrNi2 Alloy Steel by Laser Melting Deposition

Cui

Dong³

et al. 2020

Materials

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“…(2) Heat which is generated by plastic deformation and keyhole effect are ignored. (3) Without considering the pool flowing, the fluid is regarded to solid with low stress.2.3 Heat sourceWhether the actual situation is accurately reflected by analysis results is largely depended on the heat source model which is appropriate choose or not, the calculating precision of temperature field has important effect, especially on the molten pool in the high temperature area near the heat source[5] . Considering the influence of heat source, a part of heat of laser cladding process is input to the work-piece by heat conduction and radiation, the heat source model of Gauss distribution is choose in this paper, and Gauss distribution function is used as follow.…”

mentioning

confidence: 99%

Numerical Analysis of Temperature Field of Co-Based Alloy Coatings by Laser Cladding on the Mild Steel

Lin¹,

Zhu

et al. 2013

AMM

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In order to analyze temperature field of Co-based alloys laser cladding, the model of Co-based alloys laser cladding with preset-powder method has been made by finite element method. The temperature field of coatings was analyzed by SYSWELD software, and Experimental verification is done. The results showed that temperature field changed from non-steady-state to steady-state in the laser cladding process. Favorable metallurgy bonding with 8.26% dilution was obtained by scanning velocity was 5 mm/s, the temperature gradient of surface coatings is obviously decreased to 1/20 of bonding interface, the solidification rate of surface is nearly 70 times of bonding interface. Right power with 1.6 kW and 1.87 kW was found when scanning velocity was 3 mm/s and 4 mm/s by SYSWELD software. Based on solidification theory, shape factor of crystallization are analyzed, these are consistent with experimental results. These results provide reference and guide for parametric optimization and control dilution rate of laser cladding. Key words: Laser cladding, Co-based alloy, SYSWELD, Simulation

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An Experimental and Simulation Study for Powder Injection Multitrack Laser Cladding of P420 Stainless Steel on AISI 1018 Steel for Selected Mechanical Properties

Nazemi

Urbanic

2017

Journal of Manufacturing Science and Engineering

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Laser cladding is a rapid physical metallurgy process with a fast heating–cooling cycle, which is used to coat a surface of a metal to enhance the metallurgical properties of the substrate's surface. A fully coupled thermal–metallurgical–mechanical finite element (FE) model was developed to simulate the process of coaxial powder-feed laser cladding for selected overlap conditions and employed to predict the mechanical properties of the clad and substrate materials, as well as distortions and residual stresses. The numerical model is validated by comparing the Vickers microhardness measurements, melt pool dimensions, and heat-affected zone (HAZ) geometry from experimental specimens' cross sectioning. The study was conducted to investigate the temperature field evolution, thermal cycling characteristics, and the effect of deposition directions and overlapping conditions on the microhardness properties of multitrack laser cladding. This study employed P420 stainless steel clad powder on a medium carbon structural steel plate substrate. The study was carried out on three case studies of multitrack bead specimens with 40%, 50%, and 60% overlap. The results provide relevant information for process planning decisions and present a baseline to the downstream process planning optimization.

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Numerical Simulation of Temperature Field and Stress Field to Multiple Laser Cladding Co Coatings

Cited by 3 publications

References 3 publications

Numerical Simulation and Experimental Study on Residual Stress in the Curved Surface Forming of 12CrNi2 Alloy Steel by Laser Melting Deposition

Numerical Simulation and Experimental Study on Residual Stress in the Curved Surface Forming of 12CrNi2 Alloy Steel by Laser Melting Deposition

Numerical Analysis of Temperature Field of Co-Based Alloy Coatings by Laser Cladding on the Mild Steel

An Experimental and Simulation Study for Powder Injection Multitrack Laser Cladding of P420 Stainless Steel on AISI 1018 Steel for Selected Mechanical Properties

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