Manufacturing of Functionally Graded PM Materials for Hot Work Tools

摘要

This work is focused on increasing the local wear resistance of PM components by producing anadapted hard material gradient in highly stressed areas. The production principles are investigated byaxial pressing and sintering of cylindrical specimens. The gradients are produced through a gradeddispersion of tungsten carbide in a ductile matrix powder. In subsequent experiments, wear resistantgraded forging dies are fabricated consisting of alloyed steel as a ductile base material and a gradientof fused tungsten carbide (FTC). In order to achieve a full compaction and sufficient mechanicalproperties, the graded die is manufactured by hot isostatic pressing. Using the near-net-shapeapproach, a solid mold element is applied during pressing to form the die contour geometry in thegraded powder bulk. Thereby, the gradient structure can be produced parallel to the die contour andan excessive material removal through final machining is avoided.