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Metals 2019, 9(2), 264; https://doi.org/10.3390/met9020264

Porosity and Microstructure Iron-Based Graded Materials Sintered by Spark Plasma Sintering and the Conventional Method

1
Institute of Materials Engineering, Cracow University of Technology, Al. Jana Pawła II 37, 31-864 Kraków, Poland
2
Institute of Advanced Manufacturing, Centre for Materials Research and Sintering Technology, Technologies, ul. Wrocławska 37, 30-011 Kraków, Poland
*
Author to whom correspondence should be addressed.
Received: 27 January 2019 / Revised: 16 February 2019 / Accepted: 20 February 2019 / Published: 23 February 2019
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Abstract

Using PNC-60 powder with the addition of graphite, cylindrical products characterized by different compositions of core and outer layers were made. Some compacts were sintered via the conventional process, while others were subjected to the spark plasma sintering method (SPS) at different times and temperatures. The gradient microstructure was obtained in the transition zone by mixing powders during die filling, followed by pressing and diffusion during sintering. The effect of sintering parameters on the nature of the gradient zone and the morphology of the pores was shown. After conventional sintering, the gradient zone was wider than it was after SPS. Via SPS, the short sintering time confined the diffusion to a local range, making its influence on the gradient structure negligible. Differences in the microstructure were confirmed by functional description. View Full-Text
Keywords: functional gradient materials (FGM); powder metallurgy (PM); ferrous steels; sintering; spark plasma sintering (SPS); porosity; microstructure functional gradient materials (FGM); powder metallurgy (PM); ferrous steels; sintering; spark plasma sintering (SPS); porosity; microstructure
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Zarębski, K.; Putyra, P.; Mierzwiński, D. Porosity and Microstructure Iron-Based Graded Materials Sintered by Spark Plasma Sintering and the Conventional Method. Metals 2019, 9, 264.

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