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Flaking Initiation Life under Rolling Contact Fatigue of Ceramic Coated Steels Quenched after Coating Process

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Abstract:

In our previous studies, a new surface modification method by combination of ceramic coating and heat treatment, named “substrate quenching after coating” was developed. The thrust type rolling contact fatigue tests were carried out for TiN coated steels and CrAlN coated steels processed by substrate quenching after coating, and the effects of the type of ceramic coating (TiN or CrAlN) and the quenching methods (by furnace quenching or by laser quenching) on the flaking initiation life were investigated. For the specimens quenched by furnace, the flaking life of CrAlN coated specimen was longer than that of TiN coated specimen. This reason could be explained by the difference of the oxidization of CrAlN and TiN in their furnace quenching process. For CrAlN coated specimens, the flaking life of the specimens quenched by laser was longer than that of the specimens quenched by furnace. This reason could be explained by the difference of the process time of the furnace quenching and the laser quenching. It is considered that laser quenching after coating could be an effective way to improve the flaking initiation life under rolling contact fatigue.

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Periodical:

Applied Mechanics and Materials (Volume 597)

Pages:

157-160

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.597.157

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Online since:

July 2014

Authors:

Hirotaka Tanabe*, Keiji Ogawa, Motoyuki Nishizawa, Yui Izumi, Tohru Takamatsu

Keywords:

Adhesive Strength, Heat Treatment, Laser, Rolling Contact Fatigue, Thin Film

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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