Microstructural Evolution during Tempering of 16Cr-5Ni Stainless Steel: Effects on Final Mechanical Properties

Abstract:

In this work, the structural behaviour during tempering of two different heats of 16Cr-5Ni supermartensitic stainless steel has been studied by means of dilatometry, transmission electron microscopy and X-ray diffraction. A thermomechanical simulator (Gleeble 3800) has been also used to characterize the effects on final mechanical properties of different tempering temperatures in the range 600 °C to 700 °C and the influence of sub-zero cooling on industrial double tempering treatments. It has been found that the pre-existence of retained austenite in as-quenched conditions can induce significant differences in the microstructural evolution during tempering and on the final mechanical properties of industrial components, thus inducing problems in controlling final maximum hardness allowable by normative requirements.

• Periodical: Materials Science Forum (Volume 762)
• Pages: 176-182
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.762.176
• Online since: July 2013
• Authors: Massimo De Sanctis, Renzo Valentini, Gianfranco Lovicu, Antonella Dimatteo, Randa Ishak, Umberto Migliaccio, Roberto Montanari, Emanuele Pietrangeli
• Keywords: Austenite Reversion, Supermartensitic Stainless Steels, Tempering Treatments

References

[1] H.J. Nieredau: ASTM STP 756, V.G. Behal and A.S. Melilli Eds., American Society for Testing and Materials, (1982), pp.382-393.

[2] Y. Iwabuchi, I. Kobayashi, M. Ohmori and M. Kikuchi: J. Japan Inst. Metals Vol. 58 (1994), pp.411-417.

[3] Y.K. Lee, H.C. Shin, D.S. Leem, J.K. Choi, W. Jin, C.S. Choi: Mater. Sci. Tech. Vol. 19 (2003), pp.393-398.

[4] Y.Y. Song, X.Y. Li, L.J. Rong, D.H. Ping, F.X. Yin, Y.Y. Li: Mater. Lett. Vol. 64 (2010), pp.1411-1414.

[5] A. Dimatteo, G. Lovicu, M. De Sanctis, R. Valentini, A. Solina: Metall. It. Vol. 11-12 (2006), pp.37-41.