Martin Gagné

TL;DR: In this paper, the authors describe various routes that increase green strength of P/M components and make feasible green machining of un-sintered powder metallurgy parts.

Abstract: P/M parts are often machined after sintering to meet tight dimensional tolerances or accommodate design features that cannot be molded during compaction. The development of new polymeric lubricants opens the possibility of machining P/M components prior to sintering, which could result in a considerable reduction of machining costs. This study compares the green and ejection characteristics of binder-treated FC-0205 mixes containing either a new high green strength lubricating system or conventional EBS wax. The comparison was carried out on TRS specimens and gears pressed from 6.8 to 7.2 g/cm 3 on laboratory and production scale presses. The influence of these lubricating systems on green machining was also determined on gear shape specimens pressed to 6.8 and 7.0 g/cm 3 . Results showed that mixes containing the new lubricating system exhibit similar compressibility and a better lubrication behavior than mixes admixed with the conventional EBS wax. Moreover, the green strength of gears produced with the new lubricating system was sufficiently high to enable machining in the green state.

TL;DR: In this paper, the inclusion behavior during hot rolling continuously cast (c.c.) billets to wire rods is reviewed and the relationship between inclusion deformability and composition was investigated at the laboratory scale and the results were applied to the control of cleanliness in c.c. billets.