Effects of Mo ion implantation on rolling contact fatigue behavior of carbon steel

Book · Fri Nov 01 04:00:00 EST 1996

OSTI ID:382828

Yang, D; Zhou, J ^[1]

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1. Prairie View A and M Univ., TX (United States). Dept. of Mechanical Engineering

Rolling Contact Fatigue (RCF) is one of the most serious material surface damage problems encountered by many critical components, especially in ball-bearing applications. RCF is sensitive to the material strength, hardness, surface morphology, microstructure and stress status, which may be dramatically changed by surface modifications. In present work, the surface modification of molybdenum ion implantation into quenched carbon steel was employed, and RCF tests on the implanted specimens, as well as the unimplanted, were performed. It was found out that carbon steel specimens, with and without ion implantation, have the same fatigue damage characteristics. They both have circular and fan-like pits on the fatigue failed surfaces, with many spherical debris existing in the fan-like pits. However, molybdenum ion implantation reduced the rolling contact fatigue life of quenched carbon steel. The possible reasons are the following: the ion beam current is too large, which causes the specimen to undergo the annealing process and soften during the implantation process; the incident angles of ions are different for different spots of curve specimen surface, which causes the uneven distribution of residual stress. These will promote the crack initiation and propagation.

• OSTI ID: 382828
• Report Number(s): CONF-960154--; ISBN 0-9648731-8-4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBON STEELS
CRACK PROPAGATION
EXPERIMENTAL DATA
ION IMPLANTATION
MECHANICAL TESTS
MOLYBDENUM
SERVICE LIFE