炭素鋼の衝撃引張疲労破面の様相

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In order to investigate the behavior of metals on impact fatigue, the new-type universal impact fatigue testing machine for the tests under various conditions of stress or impact velocity was devised. Then, the three tests under different load conditions, the impact tensile tests, the impact tensile fatigue and no-impact push-pull fatigue tests, have been carried out on 0.21%C steel circular notched specimens at room temperature. To understand the surface features on the impact fatigue fracture, each fractured surfaces were observed by means of scanning electron microscope. The main results obtained were as follows: (1) The four features, the lamella pattern on stage I fractured surface, the striation pattern, the dimple pattern and the cleavage pattern, were observed on both impact fatigue and non-impact fatigue fracture surface. The appearances of lamella and striation pattern on the impact fatigue fracture surface were clearer than that on the non-impact fatigue fracture surface at the same stress level. (2) And also, the striations with chasms were observed on the former surface, but not on the latter one. It can be considered that the existence of this topography is the individual features on the impact fatigue fracture surface due to the variation of stress at crack tip. (3) According to the increase of mean stress level, the area of stage I fractured surface decreased and the area of dimple pattern increased consequently. Also the striations had a tendency to disappear with the increase of mean stress.
社団法人日本材料学会の論文
1976-01-15

炭素鋼の衝撃引張疲労破面の様相

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