Research progress on problems related to laser surface enhancement

surface strengthening;  laser;  Phase change strengthening

The research status of laser surface strengthening related problems is introduced and prospected. The main contents include: (1) laser surface strengthening process and its control research. The use of beam transformation to form a specific array or periodic distribution of the beam is a very promising advanced process; (2) Numerical simulation and optimization and evaluation of strengthening process. Semi-analytical and axisymmetric (finite element) models can perform semi-quantitative calculation and analysis of strengthening process parameters and results, while the calculation and prediction of temperature field, multiple phase transitions, microstructure evolution, final phase composition and mechanical properties of the entire strengthening process of actual materials will still be the focus of future numerical simulation. (3) Beam quality and space-time transformation. The beam quality corresponds to the repeatability of the enhanced process. The study of the temporal and spatial distribution of laser beams can fully explore the potential of laser surface strengthening process to meet the specific requirements of material properties for strengthening process to the greatest extent.