SURFACE IMPROVEMENT OF DUCTILE CAST-IRON

Mahmoud, A. A.; Ammar, M. I.; Attia, G. M.; Ibrahim, S. A.

doi:10.21608/asat.1997.25417

SURFACE IMPROVEMENT OF DUCTILE CAST-IRON

Document Type : Original Article

Authors

¹ Eng. El-Nasser Petroleum Co., Suez, Egypt.

² Associat Prof., Faculty of Petr. & Min. Eng., Dept. of Metall. Eng., Suez Canal Univ., Suez. , Egypt.

³ Prof., Faculty of Petr. & Min. Eng., Dept. of Metall. Eng., Suez Canal Univ., Suez. , Egypt.

10.21608/asat.1997.25417

Abstract

Diffusion impregnation with chromium is widley used as a surface treatment for steel and gray cast-iron, but very limited in ductile cast-iron. Two types of ductile cast-iron, ferretic and 60 % pearlitic, are surface chromised under different conditions using powder pack method. The maximum attaind chromised layer thickness of 22 um with surface micro-hardness of 1950 HV. is achived after treatment at 1000.0 for 30 hours. The rate controlling of the carbide layer growth process during chromising is being the diffusion of the chroium element and the direction of layer growth is determined to be inward chromium diffusion. The evaluation of the newly formed layers by corrosion, oxidation and wear resistance are carried out and discussed in the light of the obtained results.

Keywords