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Experimental Study and Simulation of Temperature Field and Stress Field of Laser Surface Modification

Author: ChenBoTao
Tutor: HuQianWu
School: Huazhong University of Science and Technology
Course: Physical Electronics
Keywords: Laser cladding Electromagnetic induction Laser hardening Temperature field Numerical simulation
CLC: TN249
Type: Master's thesis
Year: 2011
Downloads: 127
Quote: 0
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Abstract


On the basis of laser surface modification experiments, the temperature field and the stress field of laser quenching and laser-induction hybrid cladding were analyzed respectively by means of ANSYS software in this paper.By way of finite element software ANSYS, the relationship between laser hardening depth and the temperature field of 45# steel was analyzed after laser quenching with different parameters. The temperature distribution and hardening depth upon different transform coefficient were simulated with finite element method software ANSYS, the reasonable transform coefficient of laser quenching absorption coating is obtained as 0.78 after comparison with the experimental data.The relation between temperature field and quenching depth was analyzed by fixed-point laser quenching with circular Gaussian beam on the CL60 steel; about the laser transformation hardening of 2Cr13 steel with movable uniform rectangular spot, a simulating analysis was produced about the influencing law of laser quenching parameters such as laser power, spot size and moving speed influence on the hardening depth, and the simulation results were tested and verified with the experimental data.Drawing comparisons of the different of three-dimensional temperature field and stress field between simple laser cladding and laser-induction hybrid cladding was conducted, after the heat coupling model of double heat source of electromagnetic induction and laser was found. The simulation results show that, compared with simple laser cladding, the efficiency of laser-induction hybrid cladding is enhanced remarkably, and the residual stress of cladding layer is reduced significantly. For 45# steel of 50mm thickness, numerical simulation results show that the maximum residual stress of laser-induction hybrid cladding is 60% lower than that of simple laser cladding;the residual stress of laser cladding layer of wide plate is 14MPa greater than that of narrow plate under the same technological conditions.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser > Laser applications
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