Effects of Strong Carbide-Forming Elements on Low Temperature Salt-Bath Chromizing

Abstract:

The microstructure, phase structure, white layer thickness and chromium concentration, microhardness of the chromized layer of T10 steel and 3Cr2W8V steel by low temperature salt-bath chromizing with plasma nitriding are contrasted. The chromizing process is investigated by means of optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD). Results show that the strong carbide-forming elements (Cr, W, V) obstruct the diffusion of chromium and carbon, the white layer thickness and microhardness, surface chromium concentration of the chromized layer are reduced. A chromized layer of T10 steel with average 7.3μm in thickness, 84.47% in surface chromium concentration and 1300HV-1400HV in microhardness is formed on the substrate by chromizing at 610°C for 6h, as compared to the chromized layer of 3Cr2W8V steel with average 3.3μm in thickness, 74.27% in surface chromium concentration and 1200HV-1300HV in microhardness.

• Periodical: Advanced Materials Research (Volume 214)
• Pages: 646-650
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.214.646
• Online since: February 2011
• Authors: Jin Ling Ye, Feng Ye
• Keywords: Low Temperature Salt-Bath Chromizing, Plasma Nitriding, Strong Carbide-Forming Element

References

[1] V. Agarwal and A.R. Marder: Mater. Character. 36, 35 (1996).

[2] J.W. Lee, J.G. Duh and Sh.Y. Tsai: Surf. Coat. Technol. 153, 59 (2002).

[3] J.W. Lee and J.G. Duh: Surf. Coat. Technol. 177-178, (2004), p.525.

[4] Z.B. Wang, J. Lu and K. Lu: Acta Mater. 53, 2081(2005).

[5] P.C. King, R.W. Reynoldson, A. Brownrigg and J.M. Long: Surf. Coat. Technol. 179, 18 (2004).

[6] T. Arai, K. Nakanishi, H. Takeda and H. Tachikawa: European Patent 0471276, (1991).