Effect of Hot-Dip Silicon-Aluminizing on the Anti-Carburization Behavior of High-Temperature-Resistant Steel HK40

Abstract:

High-temperature-resistant (HTR) austenitic steel HK40 is employed for being silicon-aluminized by being hot-dipped in molten aluminum and silicon alloys and diffused subsequently at 1200°C. The phases, microstructures and concentration for elements of interest in the treated case are investigated by x-ray diffraction (XRD), optical microscopy (OM), scanning electron microscopy (SEM) and energy dispersive spectrum of x-ray (EDS). The case composes of three main zones: the former hot-dipped coating zone, inter-diffusion zone, and diffusion zone of Al and Si, all of which contain quite higher contents of aluminum and silicon than substrate. Pack-carburization is used for assessing the anti-carburization behavior of the treated case. The treated case shows excellent property in hindering the inward-diffusion of carbon, even if the former hot-dipped coating zone spalls off with only diffusion zone left. High contents of aluminum, silicon and oxygen are still detected on surface of the silicon-aluminized specimen after carburization. Good anti-carburization ability of the silicon-aluminized specimen is believed mainly to be the result of the dense and stable Al2O3 and SiO2 films formed on the surface.

• Periodical: Solid State Phenomena (Volume 118)
• Pages: 173-178
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.118.173
• Online since: December 2006
• Authors: Fei Xie, John Morral
• Keywords: Carburization, High-Temperature-Resistant Steel, Hot-Dip Silicon-Aluminizing

References

[1] Grabke H J and Jakobi D: Materials and Corrosion Vol. 53 (2002), p.494.

[2] D. R. G. Mitchell and D. J. Young: Journal of Materials Science Letters Vol. 12 (1993), p.1076.

[3] R. N. Kane: Corrosion Vol. 37 (1981), p.187.

[4] G. Wahl, F. Schmaderer and W. Thiele: Thin Solid Films Vol. 94 (1982), p.257.

[5] A. Schnass and H. J. Grabke: Oxidation of Metals Vol. 12 (1978), p.387.

[6] H. J. Grabke and I. Wolf: Materials Science and Engineering Vol. 87 (1987), p.23.

[7] G. M. Smith, D. J. Young and D. L. Trimm: Oxid. Met. Vol. 18 (1982), p.229.

[8] R. B. Herchenroeder, G. Y. Lai and K. V. Rao: J. Metals Vol. 35 (1983), p.16.

[9] E. Lang, M. J. Bennett and C. F. Knights: Materials Science and Engineering Vol. 88 (1987), p.37.

[10] W. Steinkusch: Werkstoffe und Korrosion Vol. 28 (1977), p.1.

[11] J. Perkins and A. Goldberg: Oxidation of Metals Vol. 11 (1977), p.23.