| Summary: | 碩士 === 國立中山大學 === 機械與機電工程學系研究所 === 104 === The thermal-elastic-plastic finite element model has been employed to simulate the possible effects of laser scanning parameters on the surface hardening process for AISI 1045 and AISI 4140 steels. The advantage of high power density of laser beam is used to heat the work piece surface quickly to achieve self-quenching effect. The thermal-elastic-plastic finite element models in company with temperature dependent material properties are applied to characterize the possible quench and tempering effects during the single-track and multi-track laser surface heat treatment.
The effects of laser surface hardening parameters, e.g. power variation, scanning speed, and the laser spot size, on the surface temperature distribution, hardening width, and hardening depth variation during the single-track surface laser treatment process has investigated. The ranges of proper parameters in the surface treatment has been proposed. The effects of parameters, e.g. the overlap of laser track, laser scanning path, power variation, scanning speed, and the laser spot size have also been explored on the study tempering effect in the multi-track laser surface heat treatment. Numerical results reveal that the proposed finite element models are feasible to simulate the laser surface heat treatment process and tempering effect of steel.
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