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Enhancement in Viscoplastic Self-Consistent FLD Prediction Model and Its Application for Austenitic and Ferritic Stainless Steels

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Abstract

The computational algorithm of a crystal-plastic-based FLD predictive model (VPSC-FLD) developed in Jeong et al. (Model Simul Mater Sci Eng, 2016. https://doi.org/10.1088/0965-0393/24/5/055005) is enhanced. A real-time monitor process runs while the forming limit diagram is calculated by parallel computation on various strain loading paths. The monitor process enables the CPU workers to communicate with each other so that the unnecessary model runs can be determined and terminated on the fly. Moreover, the advanced numerical algorithm suggested earlier by Schwindt et al. (Int J Plast 73:62–99, 2015. https://doi.org/10.1016/j.ijplas.2015.01.005) is implemented to VPSC-FLD. The new numerical algorithm and real-time monitor has improved both the overall computational speed and the efficiency in parallel computation. The enhanced VPSC-FLD model is applied for austenitic and ferritic stainless samples in terms of flow stress–strain curve, R-values, and forming limit diagram. The linearization scheme applied on the local constitutive description is studied to reveal its impacts on various macroscopic properties. It is found that the linearization scheme with the best fit on uniaxial data is not necessary the one that gives the best predictive accuracy on the forming limit prediction.

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Acknowledgements

The support from National Research Foundation of Korea (NRF-2017R1D1A1B03031052) is kindly acknowledged.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Changwon National University, Changwon, 51140, Republic of Korea

    Youngung Jeong

  2. Outokumpu, Process R&D, 95490, Tornio, Finland

    Timo Manninen

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  1. Youngung Jeong
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Jeong, Y., Manninen, T. Enhancement in Viscoplastic Self-Consistent FLD Prediction Model and Its Application for Austenitic and Ferritic Stainless Steels. Met. Mater. Int. 25, 1548–1563 (2019). https://doi.org/10.1007/s12540-019-00292-5

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