A new mechanism in hydrogen-enhanced fatigue crack growth behavior of a 1900-MPa-class high-strength steel

International Journal of Fracture Mechanics - Tập 177 - Trang 141-162 - 2012
Junichiro Yamabe1,2,3, Takuya Matsumoto4, Saburo Matsuoka1,2,5, Yukitaka Murakami1,2
1International Institute for Carbon-Neutral Energy Research (WPI-I2 CNER), Kyushu University, Fukuoka, Japan
2Research Center for Hydrogen Industrial Use and Storage (HYDROGENIUS), National Institute of Advanced Industrial Science and Technology (AIST), Fukuoka, Japan
3International Research Center for Hydrogen Energy, Kyushu University, Fukuoka, Japan
4Graduate School of Engineering, Kyushu University, Fukuoka, Japan
5Department of Mechanical Engineering, Kyushu University, Fukuoka, Japan

Tóm tắt

This paper presents a new mechanism controlling the acceleration of fatigue crack growth of a hydrogen-charged high-strength steel (bearing steel SAE52100, σ ult > 1, 900MPa, HV = 569). Three- dimensionally complicated shape of a primary crack and secondary cracks were observed in hydrogen- charged specimens. Marked acceleration of fatigue crack growth in the presence of hydrogen was observed particularly at low test frequency, and was attributed to the initiation and successive coalescence of secondary cracks formed ahead of primary crack. These secondary cracks were produced along prior-austenite grain boundaries and carbide boundaries, or by direct cracking of carbides. Surprisingly, secondary cracks were observed outside the ordinary plastic zone ahead of the crack tip. TEM observation elucidated that the secondary cracks outside the crack tip plastic zone were produced by hydrogen-induced deformation twins impinging on grain boundaries and carbides. These results suggest a new mechanism of the acceleration of fatigue crack growth rates in high-strength steels caused by hydrogen-induced deformation twins, rather than due to hydrogen- enhanced localized plasticity. The phenomena associated with time dependent fatigue crack growth are presumed to be correlated with the initiation and coalescence of secondary cracks in the presence of hydrogen.

Tài liệu tham khảo

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