What happens to the fatigue limit of bearing steel without nonmetallic inclusions? Fatigue strength of electron beam remelted super clean bearing steel

Conference · Thu Dec 31 04:00:00 EST 1998

OSTI ID:316162

Murakami, Yukitaka; Toriyama, Toshiyuki ^[1]; Tsubota, Kazuichi ^[2]; Furumura, Kyozaburo ^[3]

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1. Kyushu Univ., Fukuoka (Japan). Dept. of Mechanical Science and Engineering
2. Sanyo Special Steel Co., Himeji (Japan)
3. NSK Ltd., Fujisawa (Japan). Material Research Center

This paper has two objectives. The first is to propose a new inclusion rating method based on statistics of extreme. The new inclusion rating method is applied to the evaluation of inclusions contained in two super clean bearing steels with a total oxygen level of 5 ppm and 8 ppm. The second objective is to investigate the critical lower bound of inclusion size which influences the fatigue limit. For this purpose, a special steel with extremely low inclusion content, the electron beam remelted super clean bearing steel(EB-CHR), was prepared. It is shown that by decreasing the size of inclusions, the detrimental effect of inhomogeneities larger in size than inclusions, becomes more important. The small inhomogeneity is thought to be a local imperfectly heat-treated structure, bainite.

• OSTI ID: 316162
• Report Number(s): CONF-9611259--; ISBN 0-8031-2421-X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BEARINGS
CLASSIFICATION
FATIGUE
INCLUSIONS
LIMITING VALUES
SIZE
STEELS