Metallurgical Defect and Hydrogen Embrittlement Failure of a Gear

Yu Zhou Gao; Zhi Wei Yu; Xiao Lei Xu

doi:10.4028/www.scientific.net/AMM.548-549.438

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 548-549Metallurgical Defect and Hydrogen Embrittlement...

Metallurgical Defect and Hydrogen Embrittlement Failure of a Gear

Abstract:

Circumferential cracking occurred on the spoke plate of a statically placed marine gear. Fractographic investigation indicates that two independent crack origins are present on the fracture surface. Intergranular fracture mode was mostly found in slow crack propagation region and the intergranular facets associated with ductile shearing. Metallographic observation reveals that a type of macro casting defect, spot-segregation, is generally present on the gear material. Large size macro spot-segregation defect zones just appear in two crack origin regions. Appearance of the large spot-segregation zones in the core of spoke plate supplies the favorable metallurgical condition for hydrogen-induced fracture: presence of excessive impurities of S, P and then appearance of abnormal microstructure of upper-bainite susceptible to hydrogen embrittlement. From the evidences it is concluded that the gear failed due to the hydrogen embrittlement. The possible source for hydrogen was introduced during melting and casting operating.

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Periodical:

Applied Mechanics and Materials (Volumes 548-549)

Pages:

438-443

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.548-549.438

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Online since:

April 2014

Authors:

Yu Zhou Gao*, Zhi Wei Yu, Xiao Lei Xu

Keywords:

Failure Analysis, Hydrogen Embrittlement, Macro Spot Segregation, Marine Gear

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* - Corresponding Author

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