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Experimental and numerical analysis on bulge forming process of GH4738 thick-walled ring

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Abstract

Ring rolling technology is widely used in the production of GH4738 aerospace rings, but the ring produced by ring rolling often has the phenomenon of uneven stress and unqualified strength. To solve these problems, the thick-walled ring bulge forming technology was proposed. In this paper, a 3D-coupled thermo-mechanical FE model of the GH4738 rectangular ring bulging process was developed, which is verified to be in good agreement with the experimental process. Based on this model, the thermal parameter distribution and evolution of GH4738 rectangular ring during the bulging process were investigated systematically. Then, the evolution of the minimum bulging displacement (BD) required for rings with the change of ring size was obtained by comparing the stress distribution of rings during the bulging process in seven cases. All these provide a theoretical basis for the selection of optimal BD in practical production. Finally, the influence of the bulging process on the microstructure and mechanical properties of GH4738 alloy ring was analyzed by experimental means, and it was verified that the bulging process can play a good role in improving the strength of the ring from the perspective of the average geometrically necessary dislocation (GND) density. The experimental results indicate that with the increase of BD, the grain size of the ring does not change that much, but the average GND density increases gradually, and the yield strength and tensile strength of the ring increase significantly.

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Funding

This work was supported by the Key Research and Development Program of Shaanxi (2020GY-253) and Natural Science Basic Research Program of Shaanxi (No.2020JQ-182).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, 710072, People’s Republic of China

    Yang Hu, Dong Liu, Yanhui Yang, Jianguo Wang & Lingwei Kong

  2. School of Materials Science and Engineering, Henan Institute of Technology, Henan, 453003, People’s Republic of China

    Xinglin Zhu

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  1. Yang Hu
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  2. Dong Liu
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  3. Yanhui Yang
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  4. Jianguo Wang
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  5. Lingwei Kong
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Correspondence to Yang Hu or Dong Liu.

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Hu, Y., Liu, D., Yang, Y. et al. Experimental and numerical analysis on bulge forming process of GH4738 thick-walled ring. Int J Adv Manuf Technol 113, 1591–1604 (2021). https://doi.org/10.1007/s00170-021-06705-3

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  • DOI: https://doi.org/10.1007/s00170-021-06705-3

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