STRUCTURE AND PROPERTIES OF BORON-BEARING IRON GRANULES FOR COMPOSITES

The structure and properties of boron-bearing iron granules and compos ite materials based on them have been examined by metallography, x-ray structure analysis, microprobe analysis, and strength testing. It is shown that one should use iron borides cooled at rates of 10(3)-10(4) deg/sec as finely divided fillers. Composites based on them are reliab le and show wear resistance at the level of materials that contain tun gsten carbides. Additional alloying of the iron borides with molybdenu m and niobium increases the resistance of alloys for operation under c onditions of gas-abrasive wear at room temperature, while alloying wit h chromium and vanadium does the same for elevated temperature.