Studium vlivu technologie rotačního kování na strukturu a vlastnosti materiálů připravených pomocí metod práškové metalurgie

Abstract

The dissertation deals with the influence of rotary swaging technology on the processing of pseudo alloys prepared by powder technology. The work focuses on material research of W-Ni-Co, W-Ni-Fe, W-Ni-Co-Re alloys, which are prepared by conventional powder metallurgy technology and subsequently processed by rotary swaging. In the investigation of these alloys, the first focus is on the determination of sintering temperatures and material composition of the sinters compared to basic non-mechanical properties such as hardness or tensile strength. Furthermore, the heating in atmospheric furnaces and the design of induction heating applications are also addressed. In the second phase, the rotational swaging behaviour was predicted using FEM simulations for two conditions, namely for rotary swaging at 900°C and at room temperature. The results from the FEM simulations were used to design the processing of the given alloys. In the last phase, the focus is on testing the materials properties using mechanical tests and structure analyses. In addition to this work is dynamic testing of tungsten penetrators. The work also includes a study of the direct consolidation of powder materials with a focus on metallographic analysis. Within this chapter, the focus is on the ODS alloy Fe-Cr-Al-Y2O3, for which the effect of consolidation temperature and CREEP properties of this material were investigated. Furthermore, this chapter discusses the possibilities of processing W-Ni-Co by direct consolidation.