K-0522 高炭素クロム軸受鋼の超高サイクル疲労における疲労き裂進展挙動に関する研究(S04-3 高強度鋼の超高サイクル疲労(2))(S04 金属材料の組織と疲労強度信頼性)

概要

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In order to investigate effect of the environment on the fatigue properties of high strength steels and surface hardened steels in the super-long life range (N≥1×10^7), cantilever type rotating bending fatigue tests were carried out for the SUJ2 high carbon chromium bearing steel at room temperature in the argon gas. The results of fatigue tests in the argon gas were compared with those in the air. As a result of fatigue tests, in the case of "surface crack origin type fracture", it was found that the fatigue lifes in the argon gas were a little longer than those in the air. Also, like the environment in the air, a facet area was found around the inclusion in the case of "interior crack origin type fracture" and the environment in the argon gas. Finally, the quantitative evaluation of internal crack initiation origin was conducted.
2001-08-22