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Induction Hardening Applications [.pdf format]

Induction heating helps put wind turbines in high gear.

Authors: Gary Doyon, Doug Brown, Valery Rudnev, Frank Andrea, Chirag Sitwala, Edison Almeida
Publication: Heat Treating Progress
Date: 10/1/2009

Accurately controlled induction heat treating systems are effectively used for induction hardening large gears and bearing races utilized in wind energy applications producing the required metallurgical properties with minimum shape distortion, providing high quality parts that directly affect the longevity of wind turbines.

Single-coil dual-frequency induction hardening of gears.

Authors: Valery Rudnev
Publication: Heat Treating Progress, Professor Induction Series
Date: 10/1/2009

Some induction heating practitioners have heard about simultaneous dual frequency gear hardening, which uses two single-frequency inverters working on the same coil at the same time. Articles discusses the next step in this technology. Circuitry and review of main process parameters of Inductoheat's induction gear hardening machine that comprises medium and high-frequency capabilities are provided here as well.

Two questions are answered (Q & A): What could be done to prevent rust staining (corrosion) and what causes soft spots when scan hardening shafts and how can soft spots can be eliminated?

Authors: Valery Rudnev
Publication: Heat Treating Progress, Professor Induction Series
Date: 9/1/2009

This article features the answers to two questions from readers about what can be done to prevent rust staining from the quenchant, and what causes soft spots and how can they be eliminated. Article also discusses a computer modeling of induction scan hardening of shafts.

Question & Answer: Prevention of cracking around holes

Authors: Valery Rudnev
Publication: Heat Treating Progress, Professor Induction Series
Date: 7/1/2009

Inappropriate design parameters may result in developing cracks near the holes. The most frequent cause of cracking is severe overheating that can lead to unwanted metallurgical microstructures, excessive grain growth, shape distortion, and decarburization, as well as grain boundary liquation, which weakens grain structure and substantially increases brittleness and sensitivity to developing intergranular cracking upon quenching. Size, location, and orientation of a hole can have a marked effect on eddy current flow and severity of overheating. Article reviews factors responsible for overheating and cracking of the holes while induction hardening shafts and prevention.

Metallurgical insights for induction heat treaters. Part 7: Barber-Pole, Snake-Skin, and Fish-Tail Phenomena

Author: Valery Rudnev
Publication: Heat Treating Progress, Professor Induction Series
Date: 5/1/2009

Heat-treat practitioners sometimes observe unusual effects in induction hardening, such as a striping phenomenon, a barber-pole effect, fish-tail effect, soft spotting, and a snake-skin effect. The appearance of different types of a striping phenomenon was discussed in Part 6 of Metallurgical insights for induction heat treaters [1]. The barber-pole, snake-skin, and fish-tail effects are discussed here.

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