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Brittle Cracking of Flanks of a Big Gear

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Abstract

Several teeth of a big helical gear were found cracked following coarse-grinding teeth after the gear was carburized. Visual observation shows that cracks are present only on the flanks at one side having an acute angle to the gear end. The cracks propagated from the flanks toward the gear end. SEM observation on the fracture surfaces reveals that intergranular and quasi-cleavage brittle fracture is the cracking mechanism of the flanks. The cracked flanks at the “acute angle” side have a weak ability to support the grinding stress induced by grinding tooth operation, which is mainly responsible for cracking of the flanks. The thick case-harden depth and weak inter-crystalline strength nature of the carburized layer facilitate the initiation and propagation of crack. Unsuitable grinding operations probably aggravate cracking of the flanks.

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References

  1. China National Standardization Committee: Determination of Carburized Depth and Metallurgic Examination of Carburizing Structure. GB9450. China Standard (1994) (in Chinese)

  2. Krauss, G.: Steel: “Heat Treatment and Processing Principle”. ASM International, Materials Park, OH (2000)

    Google Scholar 

  3. Asi, O., Can, A.A., Pineault, J., Belassel, M.: The relationship between case depth of gascarburized SAM 8620 steel. Surf. Coat. Technol. 201, 5979–5987 (2007)

    Article  CAS  Google Scholar 

  4. Krauss, G.: The microstructure and fracture of a carburized steel. Metall. Trans. 9A, 1527–1535 (1978)

    CAS  Google Scholar 

  5. Straffelini, G., Versari, L.: Brittle intergranular fracture of a thread: the role of a carburizing treatment. Eng. Fail. Anal. 16, 1448–1453 (2009)

    Article  CAS  Google Scholar 

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Authors and Affiliations

  1. Electromechanics and Material Engineering College, Dalian Maritime University, Dalian, 116026, People’s Republic of China

    Xiao-lei Xu & Zhi-wei Yu

Authors
  1. Xiao-lei Xu
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  2. Zhi-wei Yu
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Correspondence to Xiao-lei Xu.

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Xu, Xl., Yu, Zw. Brittle Cracking of Flanks of a Big Gear. J Fail. Anal. and Preven. 12, 689–696 (2012). https://doi.org/10.1007/s11668-012-9614-9

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  • DOI: https://doi.org/10.1007/s11668-012-9614-9

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