Abstract
This research investigated the microstructure and properties of brake shoes produced from high phosphorus grey cast iron with varied proportions of alloy elements. The contents of three main alloy elements in three brake shoes were 3.37C–1.64Si–2.21P, 3.17C–1.82Si–2.00P and 2.96C–2.03Si–1.79P. The graphite–austenite eutectic temperatures varied with chemical composition choice, while phosphide eutectic temperature started at 936 °C for all three compositions. The microstructures show that differences in carbon, silicon and phosphorus in the high phosphorus grey cast iron brake shoes affected number, density and length of graphite flakes. Increasing the phosphorus (from 2.00–2.21%wt) and carbon (from 3.17–3.37%wt) increased the porosity and decreased the steadite formation leading to the lowest hardness and wear resistance. The highest area fraction of steadite phase (37%) and the lowest porosity were the brake shoes with 1.79wt% phosphorus, which obtained the highest hardness of 283 HB and the highest wear resistance, superior to the brake shoes with 2.00wt% or 2.21wt% phosphorus. The highest 2.21 wt% phosphorus in brake shoe gave the highest area fraction of ferrite soft phase and the lowest area fraction of steadite hard phase, with overall the lowest hardness of 223 HB.
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Acknowledgements
The authors gratefully acknowledge full financial support from the Prince of Songkla University (ContractNo. ENG610407S, 2018), Prince of Songkla University (Contract No. ENG6201029S, 2019), Prince of Songkla University (PSU.GS. Financial Support for Thesis, 2018), Prince of Songkla University (Scholarship, 2018-2019), and Center of Excellence in Metal and Materials Engineering (CEMME), Faculty of Engineering, Prince of Songkla University (PSU). In addition, the authors would like to thank the colleagues from the Department of Mining and Materials Engineering, Faculty of Engineering, Prince of Songkla University (PSU), Thailand, for help with this work. Also, the authors are grateful to Assoc. Prof. Dr. Seppo Karrila under Publication Clinic Program from Research and Development Office, Prince of Songkla University, for suggestions and improvements to the English text.
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Khuntrakool, C., Janudom, S., Muangjunburee, P. et al. Effects of Chemical Composition on Microstructure and Properties of High Phosphorus Grey Cast Iron Brake Shoe. Inter Metalcast 16, 1221–1234 (2022). https://doi.org/10.1007/s40962-021-00671-y
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DOI: https://doi.org/10.1007/s40962-021-00671-y