Open AccessInduction hardening of steels with use of the device for incremental forming of round bars HDQT-R 30-12
Author(s) -
Michal Peković,
Jiří Vrtáček,
Tomáš Janda,
Julie Volkmannová
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/723/1/012025
Subject(s) - induction hardening , electromagnetic coil , camshaft , induction heating , hardening (computing) , materials science , turbine , induction coil , metallurgy , transformer , inductor , case hardening , composite material , mechanical engineering , engineering , electrical engineering , hardness , voltage , residual stress , layer (electronics)
Induction hardening is mainly used for treating parts in which high hardness, wear-resistance, and ductile core are required, such as spur gears, wind turbine rings, and bearings. Innovative induction hardening processes are also developed for complex automotive components, such as camshafts and crankshafts. In the process, steel is heated by passing high-frequency alternating current through a coil which is equivalent to the primary winding of a transformer. The material to be heat-treated is equivalent to a short-circuited secondary winding. The HDQT-R 30-12 device for incremental forming of round bars includes modules which can be used for heat-treating bars after rolling or even without rolling. Heating is provided by five induction coils at a faster rate than in a chamber furnace. In addition, there is less oxidation of the material surface. This paper presents findings related to microstructures and hardnesses in 42CrMo4, 13CrMo4, and S235JR steel grades after heating at different inductor coil power settings with subsequent hardening in a water bath.