A Study on the Powder Structure of Rapidly Solidified HSLA Steels.

급냉응고한 HSLA강의 분말조직에 관한 연구

The evolution of microstructures in two rapidly solidfied niobium microalloyed steels was studied. These alloys were rapidly solidified by two powder process techniques: nitrogen gas atomization and centrifugal atomization. It was found that in both powder processes, powder particles larger than $20{\mu}m$in diameter were martensitic, and that the nitrogen gas atomized particles solidified cellularly while those that were centrifugally atomized tended to solidify dendritically. Particles smaller than $1{\mu}m$ were not completely characterized because of wide variation in composition.