Novel High-Speed Steel Composite for Improved High Temperature and Mechanical Properties

本研究提出了一种在铁基基体中分散纳米级氧化物颗粒代替碳化物沉淀制备高速钢的新技术。由于化学稳定性和较小尺寸的氧化物分散体，所提出的材料应该表现出高强度，远高于600摄氏度，不像传统的高速钢。这里将研究制造过程中涉及的过程，包括首先生产具有均匀分散氧化物的铁粉，其次通过铸造或标准粉末冶金来巩固粉末。由于铁基基体中氧化物分散体的尺寸非常小且均匀性更高，该材料的其他优点可能是可磨削性和断裂韧性得到改善。传统合金化的一些高成本也可以避免。因此，该研究方法为生产优质高速模具材料提供了一种有吸引力的替代方法。

This research suggests a new technique for fabricating high speed steel by dispersing nanosized oxide particles instead of carbide precipitates within the iron-based matrix. Due to the chemical stability and smaller size of the oxide dispersoids, the proposed material should exhibit high strength well above 600 degrees C, unlike conventional high speed steels. The processes involved in the manufacture will be studied here, including firstly the production of iron powder with the uniformly dispersed oxides and secondly the consolidation of the powder by casting or standard powder metallurgy. Other benefits of the proposed material may be improved grindability and fracture toughness, due to the very small size and greater homogeneity of the oxide dispersoids within the iron-based matrix. Some of the high costs of conventional alloying would also be avoided. The research method therefore offers an attractive alternative to producing superior high speed tooling material.