Abstract
A new image for ferrous PM emerged some 20 years ago with the economically successful sintering of HSS cutting tools to net shape and near full density with acceptable and uniform microstructures, especially for single point turning. This process relies on cheap water atomized powders. Simultaneously processing of gas atomized powders by HIPing was perfected and superior quality materials, especially with high alloying additions, improved cleanliness and finer, uniform microstructures became available. Amongst subsequent developments CVD and PVD coating of HSS with TiN, continuous sintering and copper infiltration of HSS for valve seat inserts and binder assisted powder extrusion of water atomized T15 for oil hole drills should be mentioned. Ferrous PM is no longer synonymous with ‘dirty, porous and cheap’. Andrew Wronski and his fellow researchers describe three types of application relating to machining, automotive valve train and aerogas turbine bearings.
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