A study on fatigue fracture mechanism of Cr-Mo steel SCM435 in super long life range

被引：7
|
作者：
Murakami, R [1 ]
Yonekura, D [1 ]
Murayama, T [1 ]
机构：
[1] Univ Tokushima, Dept Engn Mech, Tokushima 7708506, Japan
来源：
INTERNATIONAL JOURNAL OF MODERN PHYSICS B | 2003年 / 17卷 / 8-9期
关键词：
D O I：
10.1142/S0217979203019538
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
For high strength steels, a characteristic fatigue behavior, which S-N curve comes down again in the long life region of N > 10(7) cycles, was reported by many researchers. Specifically, for high strength steel, the fatigue limit is temporal value because of the fish-eye fracture in the long life region over about N = 10(7) cycles. However, fish eye fracture does not appear for medium strength steel in super long life range. In this paper, cantilever-type rotational bending fatigue tests were carried out for quenched and tempered Cr-Mo steel (JIS: SCM435) up to 10(9) cycles at room temperature in air. The S-N curve showed a horizontal part in long life region over 10(7) cycles. In addition, fish-eye fracture was not observed and for all specimens, the crack initiation occurred from the specimen surface. The fatigue fracture behavior of SCM435 in super long life was discussed based on optical microscopy observation and scanning electron microscopy observation.
引用
收藏
页码：1697 / 1703
页数：7
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