EFFECTS OF CARBON CONTENT AND COLD-WORKING ON DAMPING CAPACITY AND MECHANICAL PROPERTY OF FE-17WT.PERCENT-MN MARTENSITIC ALLOY

Effect of carbon content on damping capacity of Fe-17%Mn alloy is inve stigated by varying the carbon content from 0.02wt% to 0.28wt%;. And c old rolling is conducted to examine its influence on damping capacity and mechanical properties in an Fe-17%Mn-0.02%C alloy. With the increa se in carbon content, damping capacity decreases due to the area reduc tion of gamma/epsilon boundaries and their mobility. Cold rolling up t o 10% is found to improve strength as well as damping capacity in an F e-17%Mn-0.02%C alloy without significant decrease in elongation. Fe-17 %Mn:X%C alloy system containing carbon below about 0.1wt%, exhibiting superior mechanical properties and good damping capacities at high str ain amplitudes, can preferably be applied as structural materials subj ected to high amplitude vibration.