Stephanie Sackl

Montanuniversität Leoben · Chair of Physical Metallurgy and Metallic Materials

Abstract Mo-Si-B alloys came into the focus of research activities as an extremely creep resistant material for high temperature oxidative environments. Here, we studied the mechanical, microstructural, and chemical changes of physical vapour deposited protective Ti-Al-N/Mo-Si-B multilayer coatings during annealing in inert and oxidative atmosphere...

Nano-composites often represent a challenge for spatially resolved analysing methods. The overlap of specific signals, for example in the mass-to-charge spectrum during atom probe tomography (APT) analysis or the intersection of electron energy loss edges in electron energy loss spectroscopy (EELS), leads to highly challenging results. Therefore, a...

Abstract Severely plastically deformed pearlitic steels often possess poor crack-growth resistance along the deformation-induced elongated nanolamellar microstructure. However, it is unknown if the crack propagates in the nanocrystalline ferrite or along the ferrite-cementite interface. Here, a pearlitic steel subjected to high pressure torsion exh...

The continuous heat treatment of high speed steels reduces the process times from several hours to a few minutes. The resulting cost savings as well as lower decarburisation and distortion make the continuous heat treatment favourable over an isothermal heat treatment. However, the microstructure-property relationship during continuous heat treatme...

An induction heat treatment is favorable compared to a conventional one mainly due to significant time and cost savings. Therefore, in this study, the microstructure property relationships during induction and conventional heat treatment of a heat treatable steel 42CrMo4 is investigated. The yield strength and hardness is slightly higher for the co...

In this work, a new theoretical approach is presented, which allows for a thermodynamics-based simulation of the precipitate evolution in the Fe-C martensitic microstructure. The approach is based on a recently developed treatment of the interaction between solute atoms with potential trapping sites, such as substitutional solute atoms, crystal def...

This study focuses on the evolution of the amount of martensite, retained austenite and the volume fraction of primary carbides during the austenitisation process. The high-speed tool steel HS 6-5-2 is investigated. The continuous heat treatment is simulated in a quenching dilatometer with heating rates of 500K/s and varying holding times. For each...

Self-tempering effects can be observed in steels with relatively high martensite start temperatures. After the formation of the first martensitic laths, carbon is able to diffuse in these laths during cooling, which can be attributed to sufficiently high temperatures. This effect cannot be observed in laths formed at lower temperatures. In steels c...

This study focuses on the comparison of mechanical and microstructural properties of induction and conventionally heat-treated steels in the as-quenched state. The investigated steel is a heat treatable 42CrMo4 steel. In order to characterize the mechanical properties, tensile tests and Vickers hardness tests are performed. The yield strength and h...