日本金属学会誌

J. Japan Inst. Met. Mater, Vol. 84, No. 03 (2020),
pp. 92-98

Rotating Bending Fatigue Property of SCM435 during Electrochemical Hydrogen Charging

Ryo Kawakami1, Kazumasa Kubota1 and Hisao Matsunaga2

1Aichi Steel Corporation, Tokai 476-8666
2Department of Mechanical Engineering, Faculty of Engineering, Kyushu University, Fukuoka 819-0395

Abstract:

The method of rotating bending fatigue test under an electrochemical hydrogen-charging was established, by which the fatigue tests were carried out for a JIS-SCM435 to study the effect of hydrogen on fatigue strength. The fatigue life of the specimen was degraded by hydrogen-charging in relatively low fatigue life regime, where the slope of S-N curve for the hydrogen-charged specimens was equivalent to that for no-charged specimens. The fatigue strength on 50% failure probability at 107 cycles under the hydrogen-charging was slightly lower than that under the hydrogen-free condition. On the surface of the non-charged specimen that was run-out at 107 cycles, a number of cracks up to ≈100 µm in length was observed. By contrast, in the hydrogen-charged specimen, no crack was observed after the fatigue testing. These results suggested that the hydrogen-charging had a negative influence on the fatigue limit as well as fatigue life of the alloy used in this study.

[doi:10.2320/jinstmet.JB201901]


(Received 2019/09/17)

Keywords:

rotating bending, fatigue, electrochemical hydrogen charging, SCM435, hydrogen embrittlement


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