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Pandat™ Simulation of the Solidification Sequence and Microstructure Development of the 2 Pct Mg-55 Pct Al-1.6 Pct Si-Zn Coating on Steel

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Abstract

The current study uses the Pandat™ software developed by CompuTherm to simulate the solidification sequence of the 2 pct Mg-55 pct Al-1.6 pct Si-Zn (wt pct) coating on steel. Using the Scheil model approach, the solidification process of the coating alloy is revealed to proceed in the following sequence: (i) primary (Al) formation at T = 553.3 to 475 °C, (ii) Si formation at T = 475 to 437.9 °C, (iii) simultaneous Si and Mg2Si formation at T = 437.9 to 383.6 °C, (iv) MgZn2 formation at T = 383.6 to 336.9 °C, and finally (v) simultaneous formation of (Zn) and MgZn2 at T = 336.9 °C to complete the solidification process, with (Al) being an important participating component throughout, and Si a significant component at Stages (ii) and (iii) and becoming insignificant at Stages (iv) and (v). It is also revealed that the remaining liquid composition varies significantly throughout the solidification process, and therefore, different isopleths must be produced to illustrate the starting solidification reactions at different stages. The simulation results are then used to interpret the complex microstructures observed in the coating.

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Notes

  1. Galvalume is a trademark of BIEC International Inc.

  2. Zincalume® and COLORBOND® are trademarks of BlueScope Limited, Australia.

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Authors and Affiliations

  1. Steel Research Australia, 20 The Crescent, Springvale, VIC, 3171, Australia

    Yisheng R. Chen

  2. CompuTherm LLC, 8401 Greenway Blvd Suite 248, Middleton, WI, 53562, USA

    Fan Zhang

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  1. Yisheng R. Chen
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  2. Fan Zhang
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Correspondence to Yisheng R. Chen.

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Manuscript submitted May 2, 2020.

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Chen, Y.R., Zhang, F. Pandat™ Simulation of the Solidification Sequence and Microstructure Development of the 2 Pct Mg-55 Pct Al-1.6 Pct Si-Zn Coating on Steel. Metall Mater Trans A 51, 5228–5244 (2020). https://doi.org/10.1007/s11661-020-05936-5

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