Abstract
To clarify the seizure resistance of radical nitrided bearing steel SUJ2, a four-ball test was carried out under dip-feed lubrication using a Soda four-ball machine. Four kinds of the combination of the ball pair were tested. The symbol N-N indicates the ball pair without nitrided, the symbol R-N indicates the ball pair in which only stationary ball was nitrided, the symbol N-R indicates the ball pair in which only rotatory ball was nitrided and the symbol R-R indicates the ball pair in which both stationary and rotatory ball were nitrided. From the test, the following results were obtained. (1) At the load stage before seizure, the value of coefficient of friction μ with ball pair N-R was the smallest of all ball pairs, and was about 0.07. (2) The order of the seizure resistance of the ball pairs was N-R>R-R>R-N>N-N. The seizure resistance for ball pair R-R was about 2.6 times as high as that for ball pair N-N, and a significant effect of the heat treatment due to radical nitriding on increasing the seizure resistance of bearing steel with a small amount of Cr content was recognized. (3) With ball pairs N-N and R-R, the critical surface temperature θcr at the risk for seizure was about 369∿376°C. The values of θcr with ball pairs R-N and N-R were about 495 and 302°C, respectively.
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
