Accession Number:

AD0270524

Title:

AN INVESTIGATION OF THE FATIGUE BEHAVIOR OF MATERIALS FOR LARGE BALL BEARINGS

Descriptive Note:

Corporate Author:

ALLOY ENGINEERING AND CASTING CO CHAMPAIGN ILL

Personal Author(s):

Report Date:

1961-08-01

Pagination or Media Count:

1.0

Abstract:

An investigation was made to develop the optimum heat treatments for materials in use, or proposed for use, in radar antennae bearings and to develop rolling fatigue data as a function of ball size and stress. The materials under study are steel types 52100, M-2, M-50 and 440C. Elastic limit, hardness and retained austenite determinations were made for each steel as a function of tempering temperature. A heat treatment giving optimum strength and stability properties was determined for each steel. The hardening characteristics of M-2 were determined on both a 4.5and a 7-in. cube. Rolling fatigue tests were run in a modified Barwell tester on 12-, 1- and 1-12-in.-diam balls of standard 52100. A rolling contact, 4-ball tester for fatigue testing of 3-to 8-in balls was designed. Analytical descriptions of the stresses and motions in the 4-ball testers are presented. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE