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Multi-scale analysis of void evolution in large-section plastic mold steel during multi-directional forging

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Abstract

The void evolution of large-section plastic mold steel during multi-directional forging (MDF) was investigated using multi-scale analysis. To simulate the forging process of the plastic mold steel (SDP1 steel) and realize micro-void reconstruction in a representative volume element (RVE), MDF experiment and void-characteristic evaluation of the SDP1 steel were carried out. Traditional upsetting and stretching forging (TUSF) and MDF were simulated to comparatively analyze the evolution of temperature, effective stress, and effective strain. By embedding RVE with a micro-void and using boundary condition by point tracking into the forging process, the single-void evolution in TUSF and MDF was studied. The effect of void orientation on single-void evolution was also investigated. The multi-scale analysis revealed the following results. (1) Compared with TUSF, MDF achieved a higher efficiency in void closure. (2) The closing efficiency of the void increased with the increase in angle θ (the angle between the Z and long axes of the void). (3) The closing efficiency increased with the increase in the orientation angle during the forging process. On the basis of the important role of the main stress in each forging step on the void closure, an integral formula of the main stress was proposed. When main compressive-stress integration reached − 0.4, the closed state of the void could be accurately determined.

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Acknowledgements

This work is supported by National Key R&D Program of China (Grant Nos. 2016YFB0300400 and 2016YFB0300404).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China

    Xuan Chen, Bo-ya Wu, Bo-liang Wu, Xiao-chun Wu & Jun-wan Li

  2. State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai, 200444, China

    Xuan Chen, Bo-ya Wu, Bo-liang Wu, Xiao-chun Wu & Jun-wan Li

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  1. Xuan Chen
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  2. Bo-ya Wu
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  3. Bo-liang Wu
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  4. Xiao-chun Wu
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Correspondence to Xuan Chen or Jun-wan Li.

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Chen, X., Wu, By., Wu, Bl. et al. Multi-scale analysis of void evolution in large-section plastic mold steel during multi-directional forging. J. Iron Steel Res. Int. 29, 1961–1977 (2022). https://doi.org/10.1007/s42243-022-00792-6

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  • DOI: https://doi.org/10.1007/s42243-022-00792-6

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