Application of electromagnetic processing for development of high-performance sintered powder metal parts |
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Authors: | Daudi R. Waryoba Winston Roberts |
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Affiliation: | 1. Division of Engineering, Penn State University, 1 College Place, DuBois, PA, 15801, USA;2. Department of Physics, Florida State University, Tallahassee, FL, 32306, USA |
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Abstract: | Electromagnetic processing was used to study the effects of electro-magneto forming on the dimensional control and thermal stability of sintered powder metal (PM) parts. The investigation was carried out on sinter-hardened, low chromium-molybdenum bainitic steel. The results show an increase in the microhardness of about 14% for the electromagnetic processed parts compared to the as-sintered parts. This was attributed to the 2% increase in the density, 17% and 29% reduction in the volume fraction of porosity and width of the bainitic lath, respectively, due to the electromagnetic processing. Dimensional characterization was carried out using a vertically aligned push-rod dilatometer. After four thermal cycles of heating and cooling, at a controlled rate of 5 °C/min to 1000 °C, the electromagnetic processed parts exhibited reduced dimensional change of about 44% lower than for the as-sintered parts. This is significantly important for applications that demand high dimensional tolerance and performance, especially at elevated temperatures. |
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Keywords: | Powder metallurgy Bainitic steel Sintering Electromagnetic forming Dilatometry |
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