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Surface decarburization behavior and its adverse effects of air-cooled forging steel C70S6 for fracture splitting connecting rod

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Abstract

Surface decarburization behavior and its adverse effects of air-cooled forging steel C70S6 for automobile engine fracture splitting connecting rod were investigated comprehensively by mechanical properties, microstructure and fracture morphology analysis. The results show that the surface decarburization in the outer surface of the fracture splitting at the big end bore and the micro-cracks in the decarburized layer are result in the uneven and spalling fracture surfaces of the waster connecting rod product. Besides, partial decarburization is produced between 900 °C and 1250 °C for heating 2 h, and decarburization sensitivity reach maximum at 1150 °C, but no complete decarburization forms for heating 2 h at 650-1250 °C. The decarburized depth follows a parabolic law with the increase of the heating time from 0.5 h to 12 h, and the decarburization sensitivity coefficient is 2.05×10-5 m·s-1/2 at 1200 °C. For the connecting rod manufacturing, surface decarburization must be under effective control during the hot forging process but not the control cooling process.

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Chao-lei Zhang, li-yao Xie & Ya-zheng Liu

  2. Xining Special Steel Co. Ltd., Xining, 810005, China

    Guang-lei Liu & lie Chen

  3. School of Mechanical Engineering, Qinghai University, Xining, 810016, China

    Jian Li

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  1. Chao-lei Zhang
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  2. li-yao Xie
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  3. Guang-lei Liu
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  4. lie Chen
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  5. Ya-zheng Liu
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  6. Jian Li
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Correspondence to Chao-lei Zhang.

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Zhang, Cl., Xie, ly., Liu, Gl. et al. Surface decarburization behavior and its adverse effects of air-cooled forging steel C70S6 for fracture splitting connecting rod. Met. Mater. Int. 22, 836–841 (2016). https://doi.org/10.1007/s12540-016-5657-x

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  • DOI: https://doi.org/10.1007/s12540-016-5657-x

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