Effect of Thermal Cycling (γ<->ε) on Martensitic Transformation Kinetics and Damping Capacity of Fe –17mass%Mn Alloy

Abstract:

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Effect of thermal cycling(γ↔ε) on γ→ε martensitic transformation kinetics and damping capacity of Fe-17mass%Mn alloy has been studied. The amount of ε martensite increases with thermal cycling in spite of decrease in Ms temperature. The increase in ε martensite content with thermal cycling is attributable to an increase in the density of martensite nucleation sites by introduction of dislocations during thermal cycling. The γ→ε martensitic transformation kinetics shows a burst mode in the non-cycled specimen, while the kinetics exhibits a sigmoidal mode in the cycled specimens. The damping capacity of the alloy increases with increasing the ε martensite content in the non-cycled specimen. On the contrary, the damping capacity of the alloy decreases with increasing the ε martensite content in the cycled specimens. The reason is that the dislocations introduced during thermal cycling, which obstruct the movement of the damping sources, become more with thermal cycling.

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Periodical:

Edited by:

N. Igata and S. Takeuchi

Pages:

59-66

DOI:

10.4028/www.scientific.net/KEM.319.59

Citation:

Y. K. Lee et al., "Effect of Thermal Cycling (γ<->ε) on Martensitic Transformation Kinetics and Damping Capacity of Fe –17mass%Mn Alloy", Key Engineering Materials, Vol. 319, pp. 59-66, 2006

Online since:

September 2006

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$35.00

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