铁基粉末冶金材料的激光淬火研究

主要研究了铁基粉末冶金材料激光淬火处理后的显微组织和硬度变化。结果表明 ,沿层深方向 ,显微组织可分为淬硬层、过渡层和原始组织高温回火区。淬硬层的最高硬度达到 82 0HV ,与基体硬度相比提高了 3倍多 ,硬度提高的主要原因是晶粒细化 ,固溶强化和位错密度的提高。

Investigation on laser quenching of ferrous P/M materials

The microstructures and hardness changes of ferrous P/M materials quenched by CO 2 laser were researched. The results show that with the increment of the depth,the microstructures can be divided into hardened layer?transition layer and high-temperature tempered layer. The highest hardness of the hardened layer is about 820HV,which is 3 times more than that of the matrix. The increment of hardness is due to refinement of grains,solution strengthening and increment of dislocation density, more content of carbon in materials and high density dislocation.