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| Effect of Laser Heating Temperature Field on 38CrNi3MoV Quenching Microstructure and Properties |
| KONG Xianjun1, WANG Minghai1, WANG Ben1, ZHENG Yaohui1, WANG Yang2, YANG Lijun2 |
(1. School of Mechatronics Engineering, Shenyang Aerospace University, Shenyang 110136, China;
2. School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China |
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Abstract In order to improve the hardness and anti-friction wear performance of the barrel, the finite element predictive model of the temperature field of the continuous semiconductor laser heating pipe line was established, and the effect of laser parameters on the temperature field of the pipe line was simulated. Combined with the simulation results, the mathematical relationship between the depth of the quenching layer and the peak temperature of the temperature field was calculated. The laser quenching test was carried out and the effect of laser power, laser diameter and laser scanning speed on the hardness and depth of the hardened layer was investigated. The microstructure change after quenching was observed by using optical microscope. The results showed that the average hardness after laser quenching was increased from 400HV to 710HV, which is increased by 43.66%, and the depth of the hard line of yin and yang lines was 1.22mm and 0.61mm, respectively. After quenching, the surface roughness of the yang line material increased from 0.548μm to 0.7005μm, and the surface roughness of the yin line material decreased from 4.424μm to 3.804μm, respectively, which is meeting the requirements of use. The microstructure transformation of the yin and yang lines after quenching was observed and analyzed using optical microscope, and the transformation rules after laser quenching was explored.
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2019, 
