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Induction Hardening Applications [.pdf format]

Simple Solution for a Typical Induction Scan Hardening Problem

Authors: Valery Rudnev
Publication: Heat Treating Progress, Professor Induction Series
Date: 9/1/2003

When purchasing an induction hardening machine, it is quite typical that the users often prefer to buy a system with some extra available power (10% - 20%) to accommodate a potential future production growth. It might sound pretty simple that required increase of the scanning speed could be simply compensated by a correspondent increase of the applied coil power. After everything seems to be done correctly and induction scanner starts to produce parts at a higher rate using higher scan speed, it might suddenly appear that the required hardness has not been achieved or/and there is an inconsistency in hardness reading (scattered soft and hard spots). This article reveals the causes of this quite typical problem and the ways to fix it.

Troubleshooting Cracking in Induction Hardening

Authors: Valery Rudnev
Publication: Heat Treating Progress, Professor Induction Series
Date: 8/1/2003

The development stage was completed, the induction hardening machine was built, run-out was successful, and the machine was shipped to the customer's plant. Either right away or after a number of successful production runs, hardened parts started to crack. Unfortunately, this situation is not uncommon. This article presents a troubleshooting strategy to correct cracking problems in induction hardening.

Can the Fe-Fe3C Phase Transformation Diagram be Directly Applied in Induction Hardening of Steel

Authors: Valery Rudnev
Publication: Heat Treating Progress, Professor Induction Series
Date: 6/1/2003

Article discusses some typically overlooked limitations of the Iron-Iron Carbide diagram in application to induction heating. This diagram might be misleading in the majority of induction hardening applications because it is valid only for the equilibrium condition of carbon steel. When determining the appropriate temperature for an induction hardening operation it is imperative to remember the limitations of the diagram, and to take into account specifics of the process such as the heat intensity and the microstructure of the "green" part.

Intricacies of Induction Hardening of Powder Metal Parts

Authors: Valery Rudnev
Publication: Metallurgia Magazine
Date: 4/1/2003

Induction hardening of powder metals has several principle peculiarities compared to hardening of wrought steels and cast irons. Microstructural heterogeneity, low density and essential porosity are major causes for poor heat treatment results. A marked difference in material properties of powder metal parts is another factor that noticeably affects the metal response to hardening by induction. This article focuses on subtle aspects of induction hardening of powder metal parts.

Comparative Study of Carburizing vs. Induction Hardening of Gears

Authors: MSC
Publication: Industrial Gears
Date: 4/1/2003

Traditional carburizing remains costly, time consuming and labor intensive. Dual-pulse induction hardening - using a single frequency for both preheat and final-heat cycles - reduces the number of steps involved by 85 percent, providing a cost-effective solution for many gear shops.

Common Misinterpretations and Confusion Appearing in Induction Heating Publications. Presentation of New Handbook of Induction Heating

Authors: Valery Rudnev
Publication: Proceedings of International Scientific Colloquium "Modelling of Electromagnetic Processing", Hannover, Germany
Date: 3/24/2003

During numerous discussions with users of induction heating technology we found that quite often some of them misinterpreted certain interrelated aspects involved in this process. One of the reasons for this is the fact that quite often descriptions of particular phenomena are contained in a variety of internal reports, scientific journals, or literature specializing in a particular (typically quite narrow) area. Some of these materials have been presented in a form that is nearly inaccessible to readers. In the newly published Handbook of Induction Heating, an attempt has been made to continue the tradition of classical texts devoted to this process to educate the wide range of the specialists involved in this technology. Another goal of this handbook is to embark upon the next step in the study and design of modern induction heating processes and equipment. An attempt has been made to bridge the gap between advanced theoretical information and information which is of concrete and practical use to the induction heating practitioners. Thus, there is a hope that this 800-page handbook will serve the industry as a complete contemporary guide to induction heating. Some of the subjects discussed in this handbook are indicated below.

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