Supersolidus liquid phase sintering of injection molded M2 tool steel

摘要

This work demonstrates that fully dense injection molded low carbon M{sub}2 tool steel can be achieved through SLPS with minimal distortion. In a N{sub}2/H{sub}2 atmosphere, rapid densification begins at 1260℃, and full density is reached at 1280℃ for a 10 min hold time. Samples sintered at temperatures greater than 1287℃ for 30 min exhibit excessive grain boundary carbide films, which is an unacceptable feature. The high carbon grade was processed for comparison to the low carbon grade; however, the work was not extensive enough to draw firm conclusions about the processing capabilities of this grade. All indications were that the high carbon grade could be processed similarly to the low carbon grade, except at a temperature 25℃ lower. The compacts are resistant to distortion, except for very thin (