High-speed steels by powder metallurgy

Powder metallurgy high-speed steels are almost always more expensive than the conventionally made counterparts but they offer the following advantages. A fine and uniform microstructure can be obtained where segregation is reduced to insignificant levels. Accordingly, better strength characteristics can be achieved provided no other defects are introduced. The fine and uniform microstructure inherently leads to better grinding properties. The uniform microstructure inherently leads to less distorsion in hardening. The alloy content of the steel can be raised without deteriorating the fineness and uniformity of the microstructure, i.e., higher hardness and resistance to wear can be achieved without sacrificing the strength and grinding properties. The superior properties may give the tools a longer life. In many cases, the production rate In expensive machines can be increased without sacrificing tool life. The new as-HIP technology also offers the possibility of producing bars and shapes with extremely short lead times and very small minimum quantities, i.e., better availability with less tied-up capital. (C) Munksgaard, 1998.