Accession Number:

ADA113582

Title:

High Fracture Toughness Bearing Development

Descriptive Note:

Final rept. 1 Apr 1979-30 Sep 1981

Corporate Author:

SKF INDUSTRIES INC KING OF PRUSSIA PA

Personal Author(s):

Report Date:

1981-12-01

Pagination or Media Count:

73.0

Abstract:

The purpose of this program is to perform fatigue life tests to compare the rolling contact performance of high energy beam surface hardened VIM-VAR M50 steel with conventionally through hardened VIM-VAR M50 steel. Two groups of 6009 size ball bearings were provided for life testing one group containing conventionally through hardened VIM-VAR M50 steel rings, the other group containing electron beam EB surface hardened VIM-VAR M50 steel inner rings, and conventionally through hardened VIM-VAR M50 steel outer rings. Each group consists of twenty bearings. Rolling contact fatigue life testing was performed yielding L10 lives of 91 million revolutions for the conventionally through hardened bearings, and 151 million revolutions for the bearing group containing the EB surface hardened inner rings. These lives are consistent with the expected performance of VIM-VAR M50 steel as indicated by comparison with the calculated adjusted rating L10 of 62 million revolutions. The surface hardened bearing rings represent the first application of high energy beam heat treatment to high-speed-steel rolling bearing components.

Subject Categories:

  • Properties of Metals and Alloys
  • Machinery and Tools
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE