以雾化预合金粉(成分为Fe-25Cr-20Ni)、Ti粉和纳米Y2O3为原料(成分配比为Fe-25Cr-20Ni4-3%Ti+3%Y2O3),通过在氮气气氛中高能球磨的方式实现了原始粉末的机械合金化。在球磨转速、球料比、球磨气氛不变的情况下,研究了球磨时间对机械合金化效果、粉末微观形貌及氮含量的影响。球磨后的粉末在900、1100和1200℃下做退火处理,研究了退火温度对粉末析出相的影响。实验结果表明球磨50h后的氧化物弥散强化(oxide dispersion strengthened,ODS)-310奥氏体钢粉末有非晶相生成。
Oxide dispersion strengthened (ODS) 310 austenitic powders were prepared from pre-alloyed and elemental powders (Fe-25Cr-20Ni+3wt. %Ti+3wt. %Y2O3) by mechanical alloying at different milling intervals. The effects of milling time on morphology, extent of mechanical alloying and nitrogen contents of powders were investigated while maintaining other milling parameters constant. The as-milled powders were then annealed in vacuum at 900, 1 100 and 1 200℃ to study the precipitations. The results showed that an amorphous phase formsed after milling for 50 h.