Abstract
For Fe-based 18Cr10Mn0.4N0.5C(0–2.17)Mo (in wt %) austenitic stainless steels, effects of Mo on pitting corrosion resistance and the improvement mechanism were investigated. Alloying Mo increased pitting and repassivation potentials and enhanced the passive film resistance by decreasing number of point defects in the film. In addition, Mo reduced critical dissolution rate of the alloys in acidified chloride solutions, and the alloy with higher Mo content could remain in the passive state in stronger acid. Thus, it was concluded that the alloying Mo enhanced pitting corrosion resistance of the alloys through increasing protectiveness of passive film and lowering pit growth rate.
Highlights
FeCrMnNC austenitic stainless steels known as high interstitial alloys (HIAs) are attractive and economical materials to replace conventional FeCrNi austenitic stainless steels [1,2,3,4,5,6,7,8,9,10]
The investigated alloys have been patented due to their corrosion resistance and mechanical properties, which are superior to commercial austenitic stainless steels such as UNS S30400 and S31603
Potentiodynamic polarization tests in chloride solutions revealed that the alloying Mo suppressed metastable pitting corrosion and raised both Epit and Erp of the alloys
Summary
FeCrMnNC austenitic stainless steels known as high interstitial alloys (HIAs) are attractive and economical materials to replace conventional FeCrNi austenitic stainless steels [1,2,3,4,5,6,7,8,9,10]. Alloying C and N in stainless steels imparts improved mechanical properties including strength and wear resistance. New FeCrMnNC alloys have been explored, with comparable and/or superior performances including strength, elongation, and corrosion resistance to the conventional FeCrNi austenite stainless steels; various types of HIAs have been designed and investigated [1,2,3,5,8,9]. The author group has made an effort to develop new HIAs with high C and N contents (C > 0.3 wt % and N > 0.3 wt %), and we have found that the Fe-based
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