CAJ | 학술논문

采用混合预合金粉末和球磨粉末的方法,制备一种具有双组态结构的铁素体合金钢,其名义成分为Fe- 14Cr-3W-0.42Ti-0.32Y.其微观组织与成分相同但是采用全球磨粉末成形的铁素体钢有明显的区别.通过热锻、空冷之后,该合金具有铁素体晶粒和马氏体晶粒混合构成的双组态结构.通过微观组织研究发现了在该合金中发生了局部的αbcc→γfcc→α'cc相变.同时,这种双组态结构能够较好地均衡合金的强度和韧性.
채용혼합예합금분말화구마분말적방법,제비일충구유쌍조태결구적철소체합금강,기명의성분위Fe- 14Cr-3W-0.42Ti-0.32Y.기미관조직여성분상동단시채용전구마분말성형적철소체강유명현적구별.통과열단、공랭지후,해합금구유철소체정립화마씨체정립혼합구성적쌍조태결구.통과미관조직연구발현료재해합금중발생료국부적αbcc→γfcc→α'cc상변.동시,저충쌍조태결구능구교호지균형합금적강도화인성.
Ferritic steel with a nominal composition of Fe-14Cr-3W-0.42Ti-0.32Y was prepared by mixing gas-atomized prealloyed powder and mechanically alloyed powder.The microstructure is much different from other ferritic steels with the same composition and prepared via only mechanically alloyed powder.A bi-modal structure,which consists of pure ferritic grains and martensitic grains,was obtained after hot forging and air cooling.A phase transformation of αbcc→γfcc→α'bcc was also discovered in microstructural observation.The bi-modal microstructure shows a good combination of high strength and high ductility.