Teplotní stabilita nástrojové oceli M300, připravené metodou laser powder bed fusion

Abstract

The diploma thesis focuses on the thermal stability of tool maraging steel M300 produced by laser powder bed fusion (LPBF) under different heat treatment regimes and long-term exposure at 400 °C. The evolution of microstructure and mechanical properties is evaluated as a function of exposure time, with emphasis on microstructure, precipitation processes, and their influence on material behaviour. The experimental work included characterization of the as-received powder, microstructure, porosity, and mechanical properties using optical and electron microscopy (OM, SEM, EBSD, EDS), image analysis, gas pycnometry, and tensile testing. The chemical composition, as-built and heat-treated microstructures were also investigated. The results contribute to understanding the relationships between heat treatment, microstructural evolution, and mechanical properties of LPBF-produced M300 steel, and provide a basis for optimizing its application under elevated temperature conditions.