高能球磨雾化铁基合金粉末的组织与性能

High-energy mechanical milling of atomized iron-based powder

采用气雾化技术制备无氧铁基合金粉末,通过在500℃空气中氧化的方式给粉末加氧,然后进行高能球磨。通过氧含量测定、X射线衍射(XRD)、扫描电镜(SEM)分析及显微硬度测定,研究高能球磨后粉末组织与性能的变化。结果表明:球磨后粉末氧含量变化不明显,显微硬度大幅度提高;随球磨时间的延长,衍射峰逐渐宽化;通过球磨获得了晶粒细小、晶粒度分布较均匀的粉末颗粒,尤其是在球磨24 h、交替运行30 min条件下获得的粉末颗粒,不仅晶粒细小而且氧含量分布均匀。

The preparation of atomized iron-based powder which was oxidized at 500℃ by high-energy mechanical milling, and its grain fineness, surface morphology, and variation of microhardness were investigated by oxygen content, X-ray diffraction（XRD）, scanning electron microscope（SEM） and microhardness studies. The result shows that after high-energy mechanical milling the change of oxygen content is not obvious, the microhardness is increased to a large extent; and the diffraction peak is widened with the increase of the mechanical milling time. The powder particles with fine grains and homogeneous distribution are obtained by ball milling. And in special the powder with fine grain size and homogeneous distributed oxygen content is obtained by high-energy mechanical milling 24 h and alternating time of 30 min.