Al合金溶湯鍛造材の疲労き裂の発生および伝ぱ挙動に及ぼす引張予ひずみの影響

概要

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The influence of tensile pre-strain on a fatigue crack initiation and propagation behavior of a squeeze cast Al alloy, AC 4 CH-T 6, was investigated under rotating bending in comparison with that of wrought Al alloy, 6061-T 6. Fatigue strength was a little or not influenced by tensile pre-strain in both alloys. However, both the crack initiation and its propagation were influenced by pre-strain and the influence was different in the alloys. That is, in cast Al alloy, both the crack initiation and the early propagation of a shear mode crack were accelerated by pre-strain, though the influence was negligible in wrought Al alloy. On the other hand, the propagation of a tensile mode crack was suppressed by pre-strain in both alloys. The main reason for the acceleration of crack initiation in the cast Al alloy was an interface cracking or a weakening between eutectic Si particles and matrix by pre-strain.
2002-05-25