| LI Chang,YU Zhi-bin,ZHAO Jin-yue,LI Yun-fei,HAN Xing.Numerical Simulation and Experimental Study on Laser Quenching Process of Disk Laser[J],48(6):203-211 |
| Numerical Simulation and Experimental Study on Laser Quenching Process of Disk Laser |
| Received:September 27, 2018 Revised:June 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.06.024 |
| KeyWord:disk laser laser quenching phase change microstructures numerical simulation |
| Author | Institution |
| LI Chang |
1. School of Mechanical Engineering and Automation, University of Science and Technology Liaoning, Anshan , China; 2. Boiler Project Department, Energy China NEPC, Shenyang , China |
| YU Zhi-bin |
1. School of Mechanical Engineering and Automation, University of Science and Technology Liaoning, Anshan , China; 2. Boiler Project Department, Energy China NEPC, Shenyang , China |
| ZHAO Jin-yue |
1. School of Mechanical Engineering and Automation, University of Science and Technology Liaoning, Anshan , China; 2. Boiler Project Department, Energy China NEPC, Shenyang , China |
| LI Yun-fei |
1. School of Mechanical Engineering and Automation, University of Science and Technology Liaoning, Anshan , China; 2. Boiler Project Department, Energy China NEPC, Shenyang , China |
| HAN Xing |
1. School of Mechanical Engineering and Automation, University of Science and Technology Liaoning, Anshan , China; 2. Boiler Project Department, Energy China NEPC, Shenyang , China |
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| Abstract: |
| The work aims to obtain the transient law of laser quenching temperature field and microstructure transformation law of 45 steel obtained through simulation calculation, get the formation and transformation degree of martensite, and measure the layer depth and width of quenching phase transformation hardening. Based on COMSOL Multiphysics, the thermodynamic coupling model for laser quenching process of 45 steel plate laser was established and the changes of physical parameters during laser quenching were calculated by JMatpro to modify the physical parameters of the model. At the same time, based on 4000 W disk laser, a quenching experiment of 45 steel was carried out. The quenching microstructure and phase change hardening law of 45 steel were observed by Axioskop 2 scanning electron microscope, Zeiss-ƩIGMA HD field emission electron microscopy and HXS-1000A microhardness tester. Under the same laser power, the hardened layer and heat-affected zone of disk laser quenching were obviously larger than those of conventional laser quenching, the boundary of phase transformation was clear, the quenching affected zone showed Gaussian distribution, and the microstructure transformation effect in the complete phase transformation zone was better, and the heat-affected transition zone was approximately equidistant along the Gaussian arc. The laser quenching layer was composed of completely quenched phase transformation zone, incomplete quenched zone and core matrix, from the outside to the inside. Fine needle like martensite and a small amount of retained austenite were formed in the complete quenching zone; the hardened layer showed Gauss distribution, the depth was 1084.589 μm, the maximum width was 9761.989 μm and the hardness was 799HV. The thickness of incomplete quenched zone was 361.533 μm. All the experimental results coincide with the simulation results, and COMSOL Multiphysics can achieve an effective simulation of laser quenching process. |
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