15.05.2001 Pressing & Sintering

Influence of Notches on Fatigue Strength of High Performance PM Materials

PM² TEC 2001, in New Orleans, USA. Authors: Ulf Engström, K Lipp, C M Sonsino. The ability of PM to achieve high mechanical properties opens up many possibilities to further extend the use of PM. As fatigue properties are becoming more and more important in the applications of PM parts the demand for high performance materials and data characterising these materials is continuously increasing. In this paper fatigue life curves of some high performance PM materials are compared at two different notch factors in as-sintered condition. The results are interpreted on the basis of microstructural features, porosity and extend notches. The paper presents statistically based design data about the different materials under different stress concentrations and loading modes.