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The Influences of Carbon and Molybdenum on the Progress of Liquid Phase Sintering and the Microstructure of Boron-Containing Powder Metallurgy Steel

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Abstract

Boron is an optimal alloying element for liquid phase sintering (LPS) of powder metallurgy (PM) Fe-based materials. However, the influences of various alloying elements on the progress of LPS are still undetermined. The aim of this study was to clarify the effects of carbon and molybdenum on the LPS and microstructure of boron-containing PM steel. The results showed that adding 0.5 wt pct C and 1.5 wt pct Mo, and particularly the former, promotes the LPS and increases the sintered density. With the addition of 0.5 wt pct C, liquid can be generated in two distinct regions, and the secondary liquid improves the densification. After 1523 K (1250 °C) sintering, the increases in sintered densities of Fe-0.4B, Fe-0.4B-1.5Mo, Fe-0.4B-0.5C, and Fe-0.4B-1.5Mo-0.5C steels were 0.33, 0.47, 0.56, and 0.64 g/cm3, respectively. Thermodynamic simulation also demonstrated that the increases in sintered densities were correlated with the liquid volumes formed at 1523 K (1250 °C). In conclusion, adding 0.5 wt pct C to B-containing PM steels facilitates the formation of a secondary liquid phase and higher liquid volume, resulting in better densification.

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Acknowledgments

The author thanks the Ministry of Science and Technology of the Republic of China for the support under contract number MOST 103-2221-E-027-132. My gratitude is also extended to QMP and Höganäs AB for providing the base powders and Yu-Chi Fan for the preparations of specimens investigated in this study.

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Authors and Affiliations

  1. Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, No. 1, Sec. 3, Zhong-Xiao E. Rd., Taipei, 10608, Taiwan, ROC

    Ming-Wei Wu (Associate Professor)

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  1. Ming-Wei Wu
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Correspondence to Ming-Wei Wu.

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Manuscript submitted May 26, 2014.

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Wu, MW. The Influences of Carbon and Molybdenum on the Progress of Liquid Phase Sintering and the Microstructure of Boron-Containing Powder Metallurgy Steel. Metall Mater Trans A 46, 467–475 (2015). https://doi.org/10.1007/s11661-014-2619-0

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