Microstructure and mechanical reliability of powder metallurgy (P/M) ferrous alloys

Because of their macroscopic brittle behavior, porous powder metallurgy (PIM) ferrous alloys are often not considered for structural applications. A statistical approach based on the evaluation and interpretation of the Weibull modulus was thus proposed to evaluate correctly and objectively the intrinsic structural reliability of these materials. In spite of their porosity, P/M ferrous alloys are as reliable as conventional wrought steels, provided that they are correctly produced and, if necessary, heat treated. In addition, the influence of density and the application of the method to the process optimization and control was highlighted. In all cases, the mechanical reliability of the materials was interpreted metallurgically.