ショットピーニングによる窒化ケイ素の転動疲労強度向上

概要

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The effect of the shot-peening on rolling contact fatigue of Si3N4 was investigated. Additionally we tried to clarify damage mechanism of rolling contact fatigue. By shot-peening, high compressive residual stress can be introduced near the surface. The residual stress can improve apparent fracture toughness KIC and Vickers hardness HV of Si3N4 by approximately 73% and 8%, respectively. As a result, bending strength of pre-cracked specimen was improved 27~46% by shot-peening. The delamination damage was inhibited by shot-peening, and as a result rolling contact fatigue of the Si3N4 was improved. These results are achieved by the compressive residual stress which is introduced by shot-peening. These results indicate that shot-peening is effective method to make use of ceramics as a rolling contact member.