In the laser powder bed fusion process, the melting-solidification characteristics of 316L stainless steel have a great effect on the workpiece quality. In this paper, a multi-physics model was constructed using the finite volume method (FVM) to simulate the melting-solidification process of a 316L powder bed via laser powder bed fusion. In this physical model, the phase change process, the influence of temperature gradient on surface tension of molten pool, and the influence of recoil pressure caused by the metal vapor on molten pool surface were considered. Using this model, the effects of laser scanning speed, hatch space, and laser power on temperature distribution, keyhole depth, and workpiece quality were studied. This study can be used to guide the optimization of process parameters, which is beneficial to the improvement of workpiece quality.

To cope with the current resource, energy, and environmental problems faced by the manufacturing industry, energy conservation has become a long-term national development strategic policy. Specifically, the problems of high energy consumption and low energy efficiency in hydraulic systems have received considerable attention. Based on previous research on hydraulic energy-saving technology, this paper discusses the problems and challenges faced by such technology in higher education, the methods of integrating this technology into the curricula of mechanical majors, and the implementation of teaching reform. In the selected case study, hydraulic energy-saving technology was incorporated into the hydraulic experiment and practical training course of our school, focusing on the integration of energy-saving and emission-reduction concepts in the field of mechanical engineering teaching and research. Integrating hydraulic energy-saving technology into teaching and research not only enriches the content of mechanical engineering degree courses but also integrates professional knowledge with future work practice, provides methods and technical support for future research by teachers and students, and stimulates new ideas for the teaching reform and talent cultivation of mechanical engineering majors.