Abstract: The temperature field caused bv laser treatment is analvzed and calculated. On this ba- sis, optimized parameters and patterns are selected to treat typical test samples made of 30CrMnSiA and 30CrMnSiNi2A, and fatigue tests have been done. The results show that the fa- tigue life of the test samples made of either materials is prolonged after treatment. It is concluded that laser treatment is an efficient process to improve fatigue life of aeronautical structure steel.

Key words: laser beams, fatigue strength, construction materials