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本文通过光镜、电镜及俄歇谱仪分析,表明四种钢铁材料的激光硬化层到基体存在一个深台阶的急剧过渡,硬度落差高达HV400～600,这是陡峭温度场分布的直接结果。硬化层的第二个特征是碳的局部扩散(10～30μm)。上述因素导致第三个特征,即多样化的组织分层以及相应的特征组织形貌,如球墨周围形成马氏体硬化环带、中碳钢内层出现不同碳浓度的马氏体区等。
In this paper, the light microscope, electron microscope and Auger spectroscopy analysis show that the laser hardening layer of the four kinds of steel material to the substrate there is a rapid transition of the deep step, the hardness drop as high as HV400 ~ 600, which is the direct result of the steep temperature distribution. The second feature of the hardened layer is the localized diffusion of carbon (10-30 μm). The above-mentioned factors lead to the third feature, that is, the diversified tissue stratification and the corresponding morphological features, such as martensitic hardening zone formed around the nodular graphite, martensitic zone with different carbon concentration in the inner carbon steel, and the like.