Effects of Cold Rolling Deformation on Microstructure and Damping Capacity of a Fe-Mn-Cr-Co-Si Alloy

Abstract

The microstructure evolution of Fe-19Mn-8Cr-1Co-0.2Si (wt.%) alloy and Fe-19Mn (wt.%) alloy during cold rolling and its effect on the damping capacity of the two alloys were investigated. It was shown that the damping capacity of the two alloys was enhanced significantly owing to the deformationinduced ε-martensite and stacking faults. The Fe-19Mn-8Cr-1Co-0.2Si alloy exhibited an accelerated phase transformation from γ-austenite to ε-martensite due to a higher content of retained γ-austenite and larger grain sizes compared with the Fe-19Mn alloy, resulting in a higher maximal increment of damping capacity in this alloy caused by deformation. It was observed that no twinned ε-martensite was generated in the Fe-19Mn-8Cr-1Co-0.2Si alloy during cold rolling, resulting in a remarkable increase in the volume fraction of α'-martensite owing to no impediment to ε → α' transformation, hence the deterioration of damping capacity was slow because the α'-martensite weakened the pinning effect of dislocations on damping sources. In addition, new damping sources were provided due to the occurance of γ-austenite twinning in the Fe-19Mn-8Cr-1Co-0.2Si alloy.

A Review of Influencing Factors of Damping Properties of High Manganese Steel

“…With the addition of Cr, a large number of dislocations pinned in the alloy decreases the damping capacity at high strain amplitudes. MENG L [26] add 8 wt% Cr to Fe-19Mn then Journal of Materials Science and Chemical Engineering found that SFE increased, while the volume fraction of ε-martensite decreased and the damping performance decreased before deformation due to the addition of Cr. So, the excess Cr increases the SFE and pining point of high manganese steel and decreases the volume fraction of ε phase, which results in the decrease of damping property.…”

“…The phase transition during aging also affects the damping property, and the sensitivities of different alloys to aging are different. Meng L et al [26] found that the aging sensitivity was related to the amount of interstitial atoms and the number of damping sources, which means, the more pinning points and denser the damping sources, the effect of aging on damping property is more obvious.…”

Effect of Nb Content on Microstructure and Properties of Fe–20Mn Alloy Prepared by Ball Milling and Spark Plasma Sintering

“…At present, Fe-Mn damping alloy is mainly prepared by vacuum melting A d v a n c e V i e w technology to obtain ingots, and then plastic deformation to obtain samples 5,[18][19][20][21][22] .…”