1015 次世代新幹線用ブレーキディスクの表面改質による耐摩耗性・耐衝撃性の改善

概要

論文の詳細を見る
In order to realize of the brake disk made from the two-layers structure type of MMC, this study tried to estimate and improve the fatigue characteristic and the fracture mechanism of a two-layers structure in detail. The results obtained are summarized as follows : (1) The fatigue strength of a two-layers structure was the same as AC4CH material at the fatigue strength of Nf=1×(10)^7.(2) As a result of macroscopic observation, the destructive form of a two-layers structure had two different.(3) The origin part of a two-layers structure was the MMC section, and the final fracture was near the angle of aluminum alloys.(4) As a result of observing fracture of a two-layers structure in detail, fatigue fracture surface of face centered cubic lattice was seen from the border plane at the aluminum side. From this result, the fracture mechanism of a two-layers structures was what the fatigue crack initiation from MMC stops in a border plane, what a crack generates by face centered cubic lattice characteristic shearing strain of aluminum, carrying out ductile fracture and the last fractured.(5) From the above result, a two-layers structure type MMC has improved the consequence factor of the low-toughness of MMC. In addition, it is effective in making fatigue crack propagation stop, and has solved that it was material with high added values.
2003-09-19