Microstructure of High Cr-Alloyed Sintered Steel – Prediction and Analysis

Abstract:

Study of microstructure of high Cr-alloyed sintered austenitic stainless steel was performed in few stages XPS analysis of powder surface, theoretical prediction of microstructure by Thermo-Calc and JMatPro software and metallographic observation of sintered material. XPS analysis showed presence of thin iron oxide layer on the surface of powder particles and oxide islands formed by Si, Mn and Cr. Theoretical prediction made by Thermo-Calc and JMatPro calculations showed presence of austenite with chromium carbides and carbonitrides in equilibrium state. Both predictions are in good agreement. Metallographic observation of sintered material showed that microstructure contains small austenitic grains with size of 3-5 μm with fine carbides (1-2 μm) and carbonitrides distributed mostly on grain boundaries. Metallographic study of material confirmed theoretical predictions.

• Periodical: Materials Science Forum (Volume 782)
• Pages: 473-479
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.782.473
• Online since: April 2014
• Authors: Ruslan Shvab*, Eduard Hryha, Petro Shykula, Eva Dudrová, Ola Bergman, Sven Bengtsson
• Keywords: JMatPro Calculations, Sintered Steel, Surface Oxides, Thermo-Calc Calculations, XPS Analysis

References

[1] R.M. German, Powder Metallurgy of Iron and Steel, John Wiley, NY, USA, 1998, p.437–460.

[2] M.W. Wu, K.S. Hwang, Metall. Mater. Trans. A 37A (2006) 3577–3585.

[3] M.W. Wu, K.S. Hwang, H.S. Huang, Metall. Mater. Trans. A 38A (2007) 1598–1607.

[4] E. Dudrova, M. Kabatova, M. Kupkova, Kov. Mater. 40 (2002) 24–33.

[5] S. Saritas, R. Causton, W.B. James, A. Lawley, Adv. Powder Metall. & Particulate Mater. 10 (2001) 51–70.

[6] S. Saritas, R. Causton, W.B. James, A. Lawley, Adv. Powder Metall. & Particulate Mater. 10 (2004) 53–66.

[7] R. M. German: Powder Metallurgy Science, Second Edition, Metal Powder Industries Federation, (1994).

[8] P. Beiss, K. Dalal, R. Peters, International atlas of powder metallurgical structures. Princeton (NJ): Metal Powder Industries Federation; (2002).

[9] E. Hryha, C. Gierl, L. Nyborg, H. Danninger, E. Dudrova, Applied Surface Science 256 (2010) 3946–3961.

DOI: 10.1016/j.apsusc.2010.01.055

[10] O. Bergman, Powder Metallurgy 50 (2007) 243–249.

[11] O. Bergman, B. Lindqvist and S. Bengtsson, Mater. Sci. Forum 534-536 (2007) 545-548.

[12] O. Bergman and L. Nyborg, Powder Metallurgy Progress 10 (2010) 1-19.

[13] A. Lawley, T. F. Murphy, Materials Characterization 51 (2003) 315– 327.

[14] V.G. Gavriljuk, H. Berns, High Nitrogen Steels, Springer-Verlag, Berlin, (1999).