The Influence of Mechanical Alloying Process on Thermal Effects and Lubricant Pyrolysis of Sintered Astaloy CrM Powders

摘要

Due to the excellent combination of toughness and strength, bainitic-austenitic dual phase steels with silicon addition find many applications as structural components in the industry. However, silicon has a high affinity for oxygen and, therefore, its implementation is problematic during the sintering process of mixtured powders. Mechanical alloying (MA) offers one of the most attractive alternatives in the introduction of silicon to Astaloy CrM powders. The aim of the present study was to determine the effect of the MA process of Astaloy CrM powder with the addition of 3 wt% silicon carbide, 1 wt% stearic acid and 0.4 /0.6 wt% graphite on thermal effects during heating measured by differential scanning calorimeter (DSC) and thermogravimetry (TG) techniques. Removal of the lubricants during heating of the blended powders and exhaust gases from the furnace were monitored by quadruple mass spectrometry (QMS).