鋳造機械部品の疲労設計に関連した繰返しひずみ疲労試験およびその評価 : AC4AT6製およびFC25製のクランクケースカバーについて

概要

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In order to reduce the weight of machine elements. Al-Si cast alloy (AC4A-T6) was examined to use it for the cover of crankcase instead of grey cast iron (FC25). The fatigue strength of AC4A-T6 and FC25 specimens taken from the cover of crankcase was determined by apploying cyclic load prescribed from the local strain at the notch of specimens. The main results obtained were as follows. (1)The fatigue strength under the stress ratio R=-0.5 at N=10^7 of AC4A-T6 specimen was 68.6 MPa, which is the same as that of FC25 being used presently for the cover of crankcase. Thus AC4A-T6 can be used for the cover of crankcase instead of F25. (2) It was observed througt fractography using SEM that the fracture surface of the crack initation of AC4A-T6 considered of small pores and crcstal facts existing in matrix microstructure. Therefore, it is considered that porosity and matrix microstructure control the fatigue strength of AC4A-T6.
社団法人日本材料学会の論文
1985-12-15