利用连续多模输出的圆形CO_2 激光束对钢进行连续、大面积辐照表面强化处理,得到了厚度均匀的表面层硬化带。它与未经激光处理的钢表面层相比,显微组织发生了明显的改变,晶粒显著细化,硬度大幅度提高,缺陷密度剧增。进行对比疲劳试验的结果表明,经激光处理的试样,其疲劳区内移,疲劳寿命大大提高。 A continuous multi-mode output CO 2 laser beam is used to continuously and intensively irradiate the surface of the steel to obtain a uniform hardened surface layer. Compared with the non-laser treated steel surface layer, the microstructure changed obviously. The grain size was remarkably refined, the hardness increased greatly and the defect density increased sharply. The comparative fatigue test results show that the laser-treated specimens, the fatigue area within the shift, greatly increased fatigue life.