Hodnocení lomových ploch únavových lomů slitiny Ti6Al4V připravené 3D tiskem

Abstract

The thesis focuses on the fractographic analysis of fatigue fractures in the Ti6Al4V alloy produced by Selective Laser Melting (SLM). The aim was to identify the main fracture mechanisms and evaluate the influence of additive manufacturing and heat treatment on the characteristics of fracture surfaces. The specimens were subjected to cyclic loading at various stress levels, and the failures were analyzed using Scanning Electron Microscopy (SEM). The results show a significant influence of microstructure, porosity, and post-processing on the initiation and propagation of fatigue cracks. Typical features such as fractures originating from subsurface defects were observed in the SLM specimens. In the HIP-treated specimens, more pronounced ductile zones and fewer failure regions were identified. Thus, the study contributes to a deeper understanding of the fatigue behaviour of additively manufactured Ti6Al4V.