焼結高速度鋼SKH10の通常疲労およびフレッティング疲労特性

概要

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High-cycle fatigue, fatigue crack growth and fretting fatigue tests were carried out using sintered high speed steel SKH10 as well as the melted steel. The high-cycle fatigue and fretting fatigue strengths in sintered SKH10 steel were higher than those in the melted one by a factor of 1.2-1.3. However, the crack growth rate of sintered SKH10 steel was higher than that of the melted one. The higher fatigue strength of sintered SKH10 steel seemed to result from the fine and uniformly distributed carbide precipitates in the martensitic matrix, while the melted one had coarsen carbides which were the nuclei of fatigue crack. The higher fretting fatigue strength of sintered SKH10 steel was mainly caused by the low frictional coefficient between the contact pad and the specimen. The prediction of fretting fatigue life was made on the basis of the fracture mechanics analysis proposed in the previous paper, where the frictional force was taken into consideration. The predicted lives were in good agreement with the experimental results.
一般社団法人日本機械学会の論文
1989-05-25