Isothermal and cyclic oxidation behavior of AISI ۴۳۰ ferritic stainless steel coated with titanium

In order to improve the oxidation resistance of ferritic stainless steel, it is possible to deposit a protective coating on steel substrate. In this research through the usage of pack cementation method a coating of titanium was applied on the surface of AISI ۴۳۰ stainless steel. Scanning Electron-Microscopy (SEM), Energy- Dispersive X-ray spectrometry (EDAX) and X-ray diffraction (XRD) were used for evaluating of coating structure. Results showed that titanium coating consisted of two layers with the total thickness of ۵۰ micron. The titanized layer consisted of TiFe, TiFe۲ and Fe۲TiO۵ phases. For investigating the oxidation behavior of coated and uncoated specimens, isothermal and cyclic oxidation tests were performed at ۱۰۰۰ C. In isothermal oxidation, the oxidation resistance of the titanium coated specimens was improved by restricting the outward penetration of chromium cation. The results of cyclic oxidation of titanium coated samples indicated that they were resistance to lamination and cracking.

Keywords:

AISI ۴۳۰ stainless steel , Titanium , pack cementation , oxidation