Influences of Si and Co Addition on Microstructure and Damping Capacity of Fe-Mn Alloy
Microstructures and damping properties have been investigated in Fe-23%Mn-(0~2)%Si and Fe-23%Mn-(0~2)%Co alloys, based on experimental results from metallography, X-ray diffractometry and vibration test in a flexural mode. The amount and number density of ε martensite are increased with an increase in Co content, resulting in the improvement of damping capacity. For the same ε martensite content, the higher the Co content, the greater the damping capacity. On the contrary, an addition of Si affects to decrease the amount and number density of ε martensite, giving rise to a decay of damping capacity. The decreased ε martensite content by the addition of Si would be attributed to an increase in critical driving force for the γ→ε martensitic transformation by solution hardening effect.
N. Igata and S. Takeuchi
J. H. Jun, Y. K. Lee, J. M. Kim, K. T. Kim, W. J. Jung, "Influences of Si and Co Addition on Microstructure and Damping Capacity of Fe-Mn Alloy", Key Engineering Materials, Vol. 319, pp. 85-90, 2006