天然微合金铁粉与碳粉在机械合金化过程中显微组织的演变（英文）

Microstructure Evolution of Natural Micro-alloyed Fe Powders and Graphic during the Mechanical Milling Process

将含有微合金元素Ti、C的铁粉与碳粉混合后进行机械合金化。采用X射线衍射仪(XRD)和扫描电镜(SEM)等测试手段研究了C含量和球磨工艺参数对粉体形貌的影响。结果表明,在球磨的初期,粉体呈片状。此外,随着球磨时间的增加,颗粒尺寸减小。球磨100h后,晶粒尺寸约47nm。高含量的碳和微合金化元素将通过扩散和固溶方式进入到铁晶体中。进一步延长球磨时间,粉末变成具有不规则形状的细小颗粒。分析了压制压力和C含量对压坯密度的影响。随C含量的增加,材料的压缩性降低。

Graphic and iron powders natural micro-alloyed with Ti and V elements were processed by mechanical milling process. The effects of C concentrations and milling processing parameters on powder particle morphology were studied using X-ray diffraction(XRD) and scanning electron microscopy(SEM). Result show that at the early stage of milling, lamellae-like microstructure is formed. With the increase of milling time, particle size decreases. The crystallite size after 100 h of milling is found to be 47 nm. Moreover, high levels of carbon and micro-alloyed elements dissolve in the iron powders during milling by diffusion and solid-state reaction. When prolonging the milling time, the powders evolve into small irregularly shaped particles. The effects of compaction pressure and C concentrations on the density of green samples were analyzed. With increasing of C content, the compressibility of the material decreases.