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Induction Hardening Applications [.pdf format]

Spray quenching in induction hardening applications

Author: Valery Rudnev
Publication: Journal of ASTM International, Vol.6, No.2
Date: 2/1/2009

Available online at www.astm.org.

Taking the crank out of induction hardening.

Author: Gary Doyon, Doug Brown, Valery Rudnev, Glen Desmier, Jeffrey Elinski
Publication: Industrial Heating
Date: 12/1/2008

Induction heat treatment is traditionally a popular choice for hardening and tempering of quality cranckshafts. This article will explain how continuous process improvement makes a good process even better.

Induction hardening of gears and critical components, Part 2

Author: Valery Rudnev
Publication: Gear Technology
Date: 11/1/2008

Induction hardening is a heat treating technique that can be used to selectively harden portions of a gear, such as the flanks, roots and tips of teeth, providing improved hardness, wear resistance and contact fatigue strength without affecting the metallurgy of the core and other parts of the component that don't require change. This article provides an overview of the process and special considerations for heat treating gears. Part I, which was published in the September/October 2008 issue, covered gear materials, desired microstructure, coil design and tooth-by-tooth induction hardening. Part II covers spin hardening and various heating concepts used with it.

Metallurgical insights for induction heat treaters. Part 6: Stripping phenomenon

Author: Valery Rudnev
Publication: Heat Treating Progress, Professor Induction Series
Date: 11/1/2008

This article is one of series of articles devoted to metallurgical aspects of induction hardening and discusses a stripping phenomenon. Heat-treat practitioners sometimes observe unusual effects in induction hardening, such as a striping phenomenon, a barber-pole effect, and a snakeskin effect. The appearance of a striping phenomenon is discussed in this article.

Innovative Induction Heating Technologies

Authors: Valery Rudnev, Doug Brown, Gary Doyon
Publication: Proceedings of Material Science & Technology, Conference & Exhibition (MS&T-08), Pittsburgh, Oct.5-9, 2008
Date: 10/5/2008

Presentation focuses on:

  1. Novel approaches to induction heat treating of critical automotive components, including but not limiting to induction contour hardening of spiral, hypoid and bevel gears with diameters from 6" to 8" (patent pending) and sprockets. Patented CrankPro Technology for non-rotational hardening and tempering of crankshafts (V-4, V-6 and V-8) and camshafts with non-convention journals and lobes.
  2. Specifics of induction hardening of hand tools (i.e., wrench jaws, hammers), fasteners, etc.
  3. Induction heating of large-diameter (8 to 12 in. and larger) billets made from carbon steels, stainless steels and Inconel, including a comparative assessment of progressive multi-stage horizontal induction heating approach vs. static heating using vertical inductors (frequency selection, electrical efficiency, system flexibility, cost, etc.).
  4. FluxManager® - technology for effective heating of carbon steel tubular goods (patented in 2007).
  5. Developing compact and highly-efficient induction tempering and stress relieving systems.

Metallurgical insights for induction heat treaters. Part 5: Super-hardening phenomenon

Authors: Valery Rudnev
Publication: Heat Treating Progress, Professor Induction Series
Date: 9/1/2008

This article is one of series of articles devoted to metallurgical aspects of induction hardening and discusses a super-hardening phenomenon. Specifics of induction hardening process and prior microstructure have a pronounced effect on the appearance of the super-hardening phenomenon. Fine grain homogenous normalized structures, as well as quenched and tempered structures have more of a chance to exhibit super-hardening. The phenomenon of super-hardening of induction surface (case) hardened parts is particularly noticeable in steels with a carbon content of 0.35 to 0.65%, case depths less than 0.125 in. (3.2mm) and heat times less than four seconds. The super-hardening phenomenon could allow a user to apply a lower steel grade (lower carbon content) without sacrificing the desired surface hardness and hardness profile of the product. Case study is provided here as well.

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