The Effect of Nickel Increasing and Aluminum Addition on Sulfidation Resistance of Fe-Ni-Cr Alloys (TECHNICAL NOTE)

In this research the effects of; increasing the amount of nickel and adding aluminum to create and prolong sulfidation resistance of Fe-Ni-Cr alloys have been investigated. Sulfidation tests were carried out at ۱۱۰۰°C in S/O bearing atmosphere. Prior to the tests, the specimens were annealed in argon at ۱۲۵۰°C for ۸ hrs. Weight changes were measured and corroded deposits were analyzed byscanning electron microscope, X-ray diffraction, energy dispersive spectrometry and optical microscope. The results showed that, sulfidation resistance decreases as nickel content increase.Aluminum addition has good sulfidation resistance effect for these alloys, since alumina layer is more protective than chromia.

Keywords:

Heat Resistant Steel , Alumina , Sulfidation , Chromia , Intermetallic Phase