机械合金化对ODS铁素体钢粉末的微观形貌和结构的影响

研究了不同转速和球磨时间对氧化物弥散强化合金粉末的微观形貌和结构的影响.XRD和SEM结果表明:当转速为380r·min^-1时,既能提高球磨效率,又可避免粉末在球磨过程中发生团聚.机械合金化中晶粒尺寸和平均颗粒尺寸的减小导致XRD衍射峰的宽化.当球磨时间为30h时,粉末平均粒径随着球磨时间的增加而迅速减小至13.4μm,粉末多呈球形,粒度分布较窄.SEM-EDS结果表明,各合金元素在粉末内部分布均匀.

Effect of mechanical alloying on the microstructural properties of powder particles for oxide dispersion strengthened ferritic steels

The effects of mechanical alloying parameters, including milling rate and milling time, on the microstructural properties of the as-milled powders were investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) results showed that the best milling efficiency could be obtained at a milling speed of 380 r·min^-1 while the grain size of the powder decreased remarkably without obvious particle agglomeration. Peak broadening in the XRD patterns occurred due to the decrease in grain size and mean particle size during mechanical alloying. The particle size decreased with increased milling time and after 30 h milling, the particles were nearly spherical shape with a uniform mean size of 13.4μm. SEM-EDS analysis of the particle cross section surface showed that all alloying elements distributed homogeneously.