Effect of Quenching Microstructure on the Formation of Reversed Austenite in 9Ni Steel

Abstract:

The microstructures of 9Ni steel by quenching at different temperatures were observed, and the effect of grain size on the formation of reversed austenite was investigated by XRD, SEM and EBSD. It was found that the reversed austenite formed easily because of the refined initial microstructure which could provide more nucleation sites. More austenite phase precipitates during tempering and stabilization because the alloying atoms can segregate into austenite easily through a short-range diffusion. Austenitizing at 750°C to 850°C for 60min coiuld causes slight coarsening of microstructure and refining of martensite packets with average size of about 5μm. Obvious coarsening occurs when austenitizing temperature is over 850°C.

• Periodical: Materials Science Forum (Volume 788)
• Pages: 277-281
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.788.277
• Online since: April 2014
• Authors: Yue Hui Yang*, Xiao Juan Zhang, Shao Qiang Yuan, Jing Li
• Keywords: 9Ni Steel, Quenching Microstructure, Reversed Austenite

References

[1] B. Fultz, J.I. Kim, Y.H. Kim: Metall. Trans. A Vol.16(1985), pp.2237-2250

[2] M. Lei and Y.Y. Guo: Acta Metall. Sin. Vol.25(1989), pp.13-17

[3] B. Fultz, J.I. Kim, Y.H. Kim: Metall. Trans. A Vol.17(1986), pp.967-972

[4] T. Kubo, A. Ohmori, O. Tanigawa: Kawsaki Steel Technical Report Vol.40(1999), pp.72-79

[5] N. Nakada, J. Syarif, T. Tsuchiyama: Mater. Sci. Eng., A Vol.374( 2004), pp.137-144

[6] Y.H. Yang, Q.W. Cai, H.B. Wu: Acta Metall. Sin. Vol.45(2009), pp.270-274

[7] Y.H. Yang, Q.W. Cai, D. Tang: Int. J. Miner. Metall. Mater. Vol.17(2010), pp.587-595

[8] R. Rautioaho, P. Karjalainen, M. Moilanen: J. Magn. Magn. Mater. Vol. 68 (1987), pp.321-327

[9] S.Q. Yuan, G.L. Liang, X.J. Zhang: J. Iron Steel Res. Int. Vol.17(2010), pp.60-63