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heat processing 3/2020: Trends & topics in the field of induction heating and heat treatment

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Author: Editorial Office

heat processing 3/2020: Trends & topics in the field of induction heating and heat treatment
Have a look at the table of contents. The world of metals, and with it the world of thermprocess technology, is facing the greatest challenges. Extracting metals, producing materials from them and adjusting desired properties requires energy. Energy which, with its mostly fossil origins, still releases CO2 both when used as a fuel and as a reducing agent. In his editorial, Gerrit Nawracala, Project Director Metallurgy & Foundry Technologies Messe Düsseldorf GmbH, speaks about the green future of the metal industries and trends of GMTN 2023.

Interviews

"We have to think out of the box to be successful"
Laurent Pelissier, CEO of ECM Technologies, talks in this interview with heat processing about success, challenges, changes and innovation in the heat treatment industry. Read the interview "I would like to enhance the technical expertise in our sales department"
Dr. Steffen Wolf, Head of Sales Europe at UPC-Marathon, a member of the Nitrex Group, speaks about his personal and corporate goals, the new branding of the Nitrex Group as well as current challenges for the heat treatment market.

Reports

Using Additive Manufacturing to optimise the design of inductor cooling channels
The cooling capability of inductor coils is the determining factor for their lifetime. Traditional production methods of inductor coils are restricted in terms of cooling channel design and hence heat dissipation rate. In that respect, the recent introduction of copper in Additive Manufacturing offers a broad variety of new design options. Some of these options are investigated in this paper. First, a numerical model of the thermal domain coupled with flow calculations is used to identify promising design approaches. The best as well as the conventional design are then built using AM. Thermographic imagery is used to assess the designs in an experimental heating setup as well as to verify the numerical results.
Modelling short-time tempering after induction surface hardening
This work presents the results regarding numerical modelling of induction hardening and tempering, in which the electromagnetic, thermal and metallurgical analysis are coupled. The model has been validated on the basis of practical experiments carried out in a laboratory and industrial environment.
Increase in efficiency by using long, multi-turn coils
For induction heating or hardening applications, the design of the coil depends primarily on the fulfilment of the process. However, the aspect of energy efficiency is playing an increasingly important role in production within the scope of energy transition and rising cost of resources. In general, there are various ways for building the coil to meet the requirements of the process. In case that the frequently used ring coils are applied, it has been shown that the efficiency can be significantly optimised by the coil length and the number of turns. Therefore, this study analyses the influence of these two parameters on energy efficiency.
Methods for surface hardening of stainless steels
In many technical applications, stainless steels are used due to their excellent corrosion resistance. However, the tribological behaviour of stainless steels is characterised by a high coefficient of friction and poor wear behaviour, which leads to the risk of seizure. Surface hardening is one way to overcome these weaknesses. Solution nitriding above 1,000 °C is mainly used for hardening martensitic and ferritic grades. In austenitic and duplex microstructures, however, the hardening effect is limited, which is why low-temperature surface hardening, i.e. Kolsterising®, is used.
Modular heat treatment using nitriding and low-pressure carburising (part 1)
Vacuum heat treatment, and with it vacuum hardening, has become increasingly important in recent decades. In addition, low-pressure carburising (LPC) has been an alternative to conventional carburising processes for more than 30 years. Its use has been further established in series production over the last 15 to 20 years. New considerations and applications now also bring together the nitriding and nitrocarburising processes with modular vacuum hardening technology. The three-part article represents basic considerations of process and plant engineering in connection with economic and environmental factors. In part 1, the plant technology is represented.

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