关键词: 机械制造工艺与设备 , 激光 , 相变硬化 , 火炮身管 , 离焦量

Abstract: Improving the longevity of artillery is always a key problem, and one of the most effective methods to solve tnis problem is through laser hardening of the artillery barrel. This will improve the ability of guns to resist wearing, ablation and the impact ablation properties. Based on an analysis of the phase transformation and the hardening capability oi laser hardening, experiments on the laser hardening of ar?tillery were described and the hardened layer，s rigidity and thickness of artillery rifles were analyzed togeth?er with the phase transformation of laser hardening. The results of focusing to various depths of the harden?ing layer were tested. After the experiment, the hardened layer of artillery bore is found to be improved and deepened. The hardened layer is found to be of fine martensitic structure.

Key words: manufacturing technology and equipment for machinery , laser , phase transformation , bar?rel of a gun , focus of laser beams