EFFECT OF NITROGEN ON DAMPING AND CORROSIVE PROPERTIES OF Fe-Mn ALLOYS

The influence of nitrogen on the damping capacity of Fe-14.1Mn and Fe-16.5Mn alloys was studied using amplitude-dependent internal friction technique.The effect of nitrogen on phase constitution,mechanical properties and corrosion resistance was investigated.The Fe-14.1Mn alloy possessed a much higher level of damping capacity than the Fe-16.5Mn alloy.The addition of approximately 0.2 wt.% of nitrogen slightly affected the damping capacity of the Fe-14.1Mn alloy and increased the damping capacity in the Fe-16.5Mn alloy.The more austenite converted to martensite,the better damping capacity was obtained after heat treatment.The corrosion resistance of both alloys in 1mol/L sulphuric acid solution was improved by more than two times due to nitrogen alloying.