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Pulsed Electric Current Sintering of Nano-Crystalline Iron-Base Powders

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Abstract:

A new process of pulsed electric current sintering was developed. It combines compaction with activated sintering effectively and can manufacture bulky nano-crystalline materials very quickly. Pulsed electric current sintering of high-energy ball-milled nano-crystalline iron-based powders is investigated in this work. A nanostructured steel is obtained with high relative density and hardness by this process. The average grain size of iron matrix is 58nm and the carbide particulate size is less than 100nm. The densification temperature of ball-milled powders is approximately 200°C lower than that of blended powders. When the sintering temperature increases, the density of as-sintered specimen increases but the hardness of as-sintered specimen first increases and then decreases. Microstructure analysis results show that the decrease of hardness is caused by the dramatic grain growth of iron matrix.

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Periodical:

Materials Science Forum (Volumes 534-536)

Pages:

589-592

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.534-536.589

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Online since:

January 2007

Authors:

Yuan Yuan Li, Yan Long, Xiao Qiang Li, Yun Zhong Liu

Keywords:

Nanocrystalline, Powder Metallurgy (PM), Pulsed Electric Current Sintering (PECS)

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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References

[1] J.R. Groza, A. Zavaliangos: Mater. Sci. & Eng. A Vol. 287 (2000), P. 171.

Google Scholar

[2] M. Omori: Mater. Sci. & Eng. A Vol. 287 (2000), P. 183.

Google Scholar

[3] D.S. Perera, M. Tokita and S. Moricca: J. Eur. Ceram. Soc., Vol. 18 (1998), P. 401.

Google Scholar

[4] V. Mamedov: Powder Metall., Vol. 45 (2002), P. 322.

Google Scholar

[5] K. Satoshi, K. Hisashi: J. of the Japan Soc. of Powder and Powder Metall., Vol. 50 (2003), P. 545.

Google Scholar

[6] R. Kalyanaraman, S. Yoo: Nano. Mater., Vol. 10 (1998), P. 1379.

Google Scholar

[7] Y.Y. Li, Y. Long, X.Q. Li et al: Mater. Sci. Forum, Vol 471-472 (2004), P. 225. 100nm 100nm 650 700 750 800 850 900 950 35 40 45 50 55 60 65 70 Rockwell hardness� HRC Sintering temperature o C Fig. 5 Rockwell hardness of sintered specimens.

Google Scholar