Abstract
Three high speed steel grades, representing low, medium and high contents of alloying elements, were investigated in a comparative drill performance test using two different work materials. The results are discussed with reference to the observed wear mechanisms. Since drill performance is usually expressed as number of holes to failure, relationships between gradual wear and final failure of the drills are emphasized. The performance tests resulted in chisel edge, crater, flank and margin wear. The corresponding wear mechanisms were studied with the aid of scanning electron and light optical microscopy. The most important mechanisms are (1) abrasive wear for drilling in a plain carbon steel and (2) adhesive wear for drilling in a quenched and tempered steel.
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