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本文介绍了用千瓦级CO_2激光器对38CrMoAl钢进行直接渗硼的试验结果。金相检验表明,激光渗硼后的组织有三个不同区域。最表层是熔化层(激光渗硼层),其次是相变硬化层和基体。渗硼层的显微硬度为HV_(0.1)1100～1500,层深80～150μm。渗硼层内显微硬度分布均匀。用俄歇微电子探针测定了熔化层内的含硼量。透射电镜检验证实,激光渗硼层是Fe,C、B三元亚共晶转变产物。其相组成为Fe_2B,Fe_3(CB)与α-Fe。38CrMoAl钢经激光渗硼后的渗层脆性比常规渗硼的低。本文还讨论了激光渗硼机理。
This paper introduces the experimental results of direct boronizing 38CrMoAl steel with kilowatt CO_2 laser. Metallographic examination showed that there are three different regions of the laser boronized structure. The topmost layer is the melted layer (laser boronized layer), followed by the phase-change hardened layer and the substrate. The microhardness of the boronizing layer is HV_ (0.1) 1100 ~ 1500 and the layer depth is 80 ~ 150μm. Boronizing layer within the microhardness distribution. The content of boron in the melted layer was measured by Auger microelectronic probe. Transmission electron microscopy confirmed that the laser boronizing layer is Fe, C, B ternary eutectic transformation products. The phase composition of Fe_2B, Fe_3 (CB) and α-Fe. The brittleness of 38CrMoAl steel after laser boronizing is lower than that of conventional boronizing. This article also discusses the laser boriding mechanism.