Study on Multi-Field Coupled Evolution Mechanism of Laser Irradiated 40Cr Steel Quenching Process Based on Phase Change Induced Plasticity

Chang Li; Hexin Gao; Xinxue Chen; Zhaotai Liu; Xing Han

doi:10.1007/s12540-021-01093-5

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자료유형: 학술저널

저자정보: Chang Li (University of Science and Technology Liaoning) Hexin Gao (University of Science and Technology Liaoning) Xinxue Chen (University of Science and Technology Liaoning) Zhaotai Liu (University of Science and Technology Liaoning) Xing Han (University of Science and Technology Liaoning)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.8

발행연도: 2022.8

수록면: 1,919 - 1,937 (19page)

DOI: 10.1007/s12540-021-01093-5

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40Cr is essential to steel for the manufacture of hardened gears, and optimizing its laser quenching process will be of greatsignificance for gear wear and life extension. However, the complete reliance on the experimental trial-and-error approachdoes not effectively reveal the mechanism of the evolution of the laser quenching process in disk laser. Numerical simulationprovides an effective way to obtain the transient evolution of the laser quenching process. In this paper, the temperaturechanges physical parameters of the quenched material are calculated based on the CALPHAD method. Establish a thermoelastic?plastic multi-field coupling model for the laser hardening process of the disk laser 40Cr gear steel. Perform thenumerical calculations on the transient temperature, martensite phase fraction, and the transformation-induced plasticitystress evolution of the 40Cr laser hardening process. Focus on the mechanism of the mutual coupling between phase changebehavior and plastic strain. Calculations show that there is heat accumulation during quenching, with a peak temperatureof 1448 K. Plastic stress has a “hump” distribution, with a peak value of 834 MPa, which is 1.25 mm from the center ofthe focal point. The experimental analyses of the 40Cr gear steel quenching microstructure and hardness distribution stateby the Axioskop2 scanning electron microscope, the KEYENCE VH-Z100R super depth of field 3D microscope, and theQ10M microhardness tester reveal the mechanical behavior of the material and the phase hardening law during the quenchingprocess. That provided an essential theoretical basis for effective prediction on quenching residual stress and optimizingindustrial production parameters.

#40Cr gear steel · Disk laser · Multi-field coupling · Phase change induced plastic stress

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