Comparison of the green strength of warm compacted Astaloy CrM and Distaloy AE Densmix powder compacts

摘要

It is important that the mechanical properties of green warm compacted powder parts be accurately determined if advanced manufacturing techniques, such green machining, are to be exploited successfully. In this study, the green strength of Astaloy CrM Densmix and Distaloy AE Densmix, two powder mixes designed specifically for such applications, was measured using the Brazilian disc compression test. Fracture statistics were employed to compare the strengths under the same compaction regime, and the Weibull modulus calculated for each case. Further tests were performed in which the warm compaction temperature and pressure were varied. It was found that a strong relationship exists between the green strength of each material and its compressibility. This relationship was explained in terms of pore size and pore distribution with respect to the stress field developed within the compact.