Study on the Influence of Warm Die Compaction Behavior on the Mechanical Properties of Iron-Based Powder Materials

Conventional powder metallurgy processes are often associated with poor strength due to the presence of porosity. Warm die compaction methods have been shown to be effective in reducing porosity while also being highly economical. This study investigated the impact of warm die compaction behavior on the sintered mechanical properties of iron-based PM. Iron-based alloys were fabricated using four types of powders, namely ASTALOY CRA, ASTALOY 85Mo, DISTROY AE, and DISTROY AQ, by compacting them under different compacting pressure using both warm die compaction at a temperature of 90 degrees C and cold die compaction at room temperature. The findings revealed that warm die compaction at 90 degrees C exhibited superior ejection performance relative to compaction at room temperature. The green density increased by 0.01-0.1 g/cm(3), and the green strength improved by 2.68-8.25 MPa. The hardness, tensile strength, and yield strength of the sintered specimens fabricated by warm die compaction were improved by 0.25-0.94%, 2.23-7.08%, and 1.23-13.23%, respectively.