Published in HTM Journal of Heat Treatment and Materials
Hot-work tools for hot forming processes, such as die forging, are subject to complex loads that can often lead to premature tool failure. The present study attempts to reduce the main cause of failure of high-speed hot working tools, i. e., wear due to surface breakdown, with the aid of damage-tolerant microstructures. For this purpose, a hot-work...
Published in HTM Journal of Heat Treatment and Materials
The purpose of this study was to explore the effect of eutectic silicon particle size on the properties of composites of carbon-nano tubes (CNTs) and AlSi10Mg prepared by powder metallurgy. The samples were studied using light microscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, friction tests and tensile e...
Published in HTM Journal of Heat Treatment and Materials
Surface heat treatments such as case hardening, nitriding and surface hardening are often used to improve the performance properties of gear components. Due to limitations in the individual processes, e. g., with regard to the distortion that occurs, the achievable hardening depth or surface hardness, combinations of several processes are important...
Published in HTM Journal of Heat Treatment and Materials
Sinter hardening grade steels were prepared using hybrid alloying by combining Cr-Mo and Mo prealloyed powders with fine Mn-Si masteralloy powders. Compacts from both base powders showed the “internal getter” effect, which however was much more pronounced for the Cr-Mo powders because of the markedly high starting oxygen content. Combining the base...
Published in HTM Journal of Heat Treatment and Materials
Gearboxes of modern drivetrains, e.g., in wind turbines, can be exposed temporarily to low ambient temperatures during their manufacturing or during operation. During manufacturing or assembly, for example, very low temperatures sometimes occur during joining processes due to the cryogenic treatment of the components. In these cases, the temperatur...
Published in HTM Journal of Heat Treatment and Materials
The combination of forming with continuous cooling bainitic steels offers a new path for reaching energy-efficient manufacturing chains. Improved energy efficiency is achievable thanks to the suppression of conventional, energy-intensive heat treatments. In the present paper, different thermomechanical processing strategies, including laboratory an...
Published in HTM Journal of Heat Treatment and Materials
This report investigates the impact of different heat treatment parameters and varying Al-contents on the microstructure of Quenching & Partitioning (Q&P) steels. Therefore, three lean-medium-Mn-steels with Al-contents between 0.3 and 0.9 wt-% underwent heat treatments according to Quenching & Partitioning regimes. For comparison, the steels were s...
Published in HTM Journal of Heat Treatment and Materials
Can residual compressive stress, which is etablished using mobile processing methods without the use of specially designed equipment (mobile blasting systems or special hammering equipment), i. e., without noteworthy machine investment, significantly increase the fatigue strength of welded structural steel structures? To answer this question, sampl...
Published in HTM Journal of Heat Treatment and Materials
In addition to various advantages over oil quenching, quenching in aqueous polymer solutions can also have disadvantages. Under certain conditions, “explosive” phenomena can occur when quenching steel components in such solutions, leading to pressure waves and vibrations in the quenching tank, which can even destroy the weld seams of the tank in th...
Published in HTM Journal of Heat Treatment and Materials
Analysing the microstructure is an essential part of quality control in many steel manufacturing and processing operations. In this work, a promising method for autonomous analysis of microstructures in low-alloy steels based on artificial intelligence image analysis is presented. This study focuses on the classification of different microstructure...
