Ling Zicheng, Chen Weiping, Xu Weiye, Zhang Xianman, Lu Tiwen, Liu Jian
Guangdong Key Laboratory for Advanced Metallic Materials Processing, South China University of Technology, Guangzhou 510640, China.
Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, China.
Materials (Basel). 2019 Jan 14;12(2):256. doi: 10.3390/ma12020256.
The influence of a Mo addition on the interfacial morphologies and corrosion resistances of novel Fe-Cr-B alloys in molten aluminum at 750 °C was systematically investigated using scanning electron microscopy, X-ray diffractometer, electron probe microanalysis, and transmission electron microscopy. The results indicated that Mo could not only strengthen the matrix but also facilitate the formation of borides. Furthermore, the microstructures of Mo-rich M₂B boride changed from a local eutectic net-like structure to a typical coarse dendritic structure and a blocky hypereutectic structure with increasing Mo addition. This was true of the blocky Mo-rich M₂B boride, rod-like Cr-rich M₂B boride and the corrosion products, which had a synergistic effect on retarding of the diffusion of molten aluminum. Notably, the corrosion resistance of the Fe-Cr-B-Mo alloy, with an 8.3 wt.% Mo addition, was 3.8 times higher than that of H13 steel.
利用扫描电子显微镜、X射线衍射仪、电子探针微分析和透射电子显微镜，系统研究了添加钼对新型Fe-Cr-B合金在750℃熔融铝中的界面形貌和耐蚀性的影响。结果表明，钼不仅可以强化基体，还能促进硼化物的形成。此外，随着钼含量的增加，富钼的M₂B硼化物的微观结构从局部共晶网状结构转变为典型的粗大树枝状结构和块状过共晶结构。块状富钼M₂B硼化物、棒状富铬M₂B硼化物及其腐蚀产物对阻碍熔融铝的扩散具有协同作用。值得注意的是，添加8.3 wt.%钼的Fe-Cr-B-Mo合金的耐蚀性比H13钢高3.8倍。
