Microstructure and Fatigue Strength of the Bearing Steel 52100 after Shortened Bainitic Treatment / J. Dong, H. Vetters, F. Hoffmann, Hans W. Zoch

Conference Author: Bearing Steel Technologies: Developments in Rolling Bearing Steels and Testing (2009 : Vancouver)
Physical Description: 1 online resource (15 pages) : illustrations, figures, tables
Additional Creators: Zoch, Hans W., Dong, J., Hoffmann, F., Vetters, H., American Society for Testing and Materials, and ASTM International

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Summary

Quenching to obtain martensite is the mostly applied process for standard rolling element bearings. Isothermal treatment in the lower bainitic range is used as an alternative method to generate favorable compressive residual stress on the surface of components, e.g., in spherical roller bearings. The duration of the bainitic treatment, however, is much longer than that of a martensitic treatment because more or less a complete transformation of austenite to bainite is usually requested. This causes higher energy consumption and a longer production period. Therefore it is desirable to perform bainitic treatment with a shortened process duration. In the present work possible processes for shortening the bainitic treatment of the bearing steel 52100 were primarily investigated by dilatometric experiments. Some selected processes were carried out in an industrial salt bath. The microstructures of bainite were observed by optical microscope, transmission electron microscope, and field emission scanning electron microscope. These were compared to martensitic microstructures. The cyclic fatigue strength of the steel after shortened bainitic treatments was examined using a rotating-bar fatigue test. The results show that the fatigue resistance while maintaining the requested minimum hardness of 58 HRC was even enhanced significantly through the shortened treatments particularly by means of a two-step bainitic treatment. The process duration was only about 25 % of the conventional time. The influence of the bainitic microstructure on the fatigue strength of the steel is discussed.

Dates of Publication and/or Sequential Designation

Volume 2010, Issue 1524 (January 2010)

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ISBN

9780803186316 (e-ISBN)
9780803175105

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text file PDF

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Includes bibliographical references 23.

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Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 2010. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.

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