Interdependence of Distortion and Residual Stress Relaxation of Cold-Rolled Bearing Rings During Heating |
| |
Authors: | Email author" target="_blank">Jérémy?EppEmail author Holger?Surm Julien?Kovac Thomas?Hirsch Franz?Hoffmann |
| |
Affiliation: | (1) Foundation Institute of Materials Science, Bremen, 28359, Germany |
| |
Abstract: | This article discusses the distortion behavior during heating of bearing rings produced by cold rolling. The residual stress
relaxation was characterized intensively and correlated to the distortion behavior. In the initial state, the rings show compressive
residual stresses in tangential and axial direction with almost no variations along the circumference. Because of the cold-rolling
process, the entire cross section is affected by residual stresses. The rings present a characteristic size change between
the soaking temperatures 773 K and 823 K (500 °C and 550 °C), which can be correlated with the macroresidual stress relaxation
in the core of the rings. Changes in roundness deviation were found, but the amplitude of oval and triangular shape increases
continuously until austenitizing temperature is reached. As the macrostress relaxation is already completed at 873 K (600 °C),
another mechanism should be responsible for these distortions. A correlation between amplitude of the oval shape and decrease
of full width at half maximum seems to be present. This may indicate that inhomogeneous recrystallization happens along the
circumference of the rings. A triangular shape may result from the influence of the loading tool used as rings are positioned
on three contact points during the stress relief treatment. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|