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用千瓦CO_2激光器对38CrMoAl铜试样表面进行直接渗硼处理。金相检验表明,渗硼后的组织为三个不同区域。最表层是熔化区(渗硼层),向里依次是相变硬化区基体。渗硼层的微硬度为Hv0.1 1100～1500,层深80～150μm,整个渗硼区内显微硬度他布均匀。芒歇微电子探针测定,渗硼层内的含量为4.4%(wt)。透射电镜检验证实,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)和αFe。激光渗硼层脆性与常规渗硼相比可望有所降低。本文并讨论了激光渗硼的机理。
The surface of 38CrMoAl copper sample was directly boronized with a kilowatt CO_2 laser. Metallographic examination showed that the organization after boronizing three different regions. The most surface melting zone (boronized layer), followed by the phase change hardening zone matrix. Boronizing layer microhardness of Hv0.1 1100 ~ 1500, layer depth 80 ~ 150μm, the entire boronizing area hardness micro-cloth he uniform. Mangshi microelectronic probe determination, boronized layer content of 4.4% (wt). Transmission electron microscopy confirmed that the boronizing layer is a Fe, C, B ternary eutectic transformation product, the phase composition of Fe_2B, Fe_3 (CB) and αFe. Laser boride layer brittleness is expected to be reduced compared with conventional boronizing. This article also discusses the mechanism of laser boronizing.