|About this Abstract
||Materials Science & Technology 2019
||Thermomechanical Processing in Shaping and Forming of Steels
||Effect of Vanadium and Aluminum Grain Refining Treatment on Steel Machinability
||Xueliang Zhang, Simon N. Lekakh, Ronald J. O'Malley, Eduardo Scheid, Mark Emmendorfer, Mike Fox
|On-Site Speaker (Planned)
||Ronald J. O'Malley
The effects of vanadium and aluminum grain refining treatment on the machinability of hot rolled plain carbon and 4140 steels were investigated using the critical tool wear method during bar turning. The flank wear on the machining tool was measured using an SEM for improved measurement accuracy. The microstructure and non-metallic inclusions in both the steel bars and machining chips were characterized using optical microscopy, micro-hardness measurements, SEM-EDS microscopy and automated inclusion analysis. Worn machining tools were also analyzed to characterize deposits found on the tool after machining. The investigation showed that aluminum treated steels exhibit better machinability than vanadium treated steels in both plain carbon and 4140 steel grades. High resolution TEM analysis provided additional information about inclusion/matrix boundary in severely deformed chips. The combined effects of hardness, microstructure and precipitates on steel machinability are presented and discussed.