【摘要】 使用自制的大功率半导体激光器对U74轨钢进行了相变硬化。结果表明,硬化层硬度值可以达到800~900 HV0.01,是基体硬度的3~4倍,沿半导体激光器光斑的不同轴向扫描对硬化层有很大影响,沿慢轴方向扫描得到的硬化层深度要远高于快轴方向,硬度值沿深度方向在过渡区附近迅速下降至基体硬度。试验表明,大功率半导体激光器在材料表面处理领域有着较为广阔的应用前景。更多还原

【Abstract】 Laser transformation hardening was carried out on U74 rail steel by a self-developed high power diode laser.The results show that the hardness of the hardened layer of the steel can reach 800～900 HV0.01,and is 3～4 times of the substrate steel′s.In addition,it is quite differences between the hardened layers scanned along fast beam axis and slow beam axis,the hardened layer is deeper when scanned along slow beam axis direction,but the hardness falls down rapidly in the transition zone.Overall,the high power diode laser is more competitive for surface hardening in laser processing field.更多还原