Effects of ɛ-martensite and dislocations behavior by thermo-mechanical treatment on Fe–Cr–Mn damping alloy

Effect of Thermo-Mechanical Treatment on the Microstructure Evaluation and Mechanical Properties of Fe-20Mn-12Cr-3Ni-3Si Damping Alloy

“…At room temperature, the treatment of steel with the austenite structure produced α′-martensite and ε-martensite, and an increase in the amount of treated specimen increased the amount of ε-martensite until ε-martensite was deformed into α′-martensite. Subsequently, the amount of ε-martensite decreased, whereas the amount of α′-martensite rapidly increased [11,12]. Further, the mechanical property of steel exhibiting such a deformation was largely dependent on α′-martensite, and its damping capacity was based on ε-martensite [12].…”

“…The cold rolling ratio of 16% was set between the highest tensile strength with the room-temperature and damping capacity for performing the thermo-mechanical treatment [11]. Further, to reverse transform the majority of the martensite created by the cold rolling, the annealing treatment was applied to the martensite, which was maintained at 700 °C for 20 minutes, followed by water cooling.…”

“…To date, the system, structure, and material damping methods have been used as the industrial noise and vibration prevention methods; however, the system and structural damping methods exhibit limited industrial applications because of the low damping capacity and applicability issues. Therefore, an effective material damping method that uses a damping alloy with high internal friction coefficient was investigated because of its excellent working property and adhesiveness, and related research was actively conducted [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15].…”

“…Because it is difficult to develop a damping alloy that can satisfy these properties, only a few types of damping alloys are currently commercially available. Thus, even though various studies related to the development of the damping alloy that satisfy the required properties and offer high applicability as a structural material by combining both the strength and the damping capacity have been conducted [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18], further research is required, particularly for attaining data to develop a damping alloy that offers an excellent combination of the strength and the damping capacity. Further, it is necessary to investigate the deformation behavior of the martensite produced by thermo-mechanical treatment, which is a useful method as a reinforcement method for austenite [9].…”

Internal friction mechanism of Fe–19Mn alloy at low and high strain amplitude

“…Presently, the studies of Fe-Mn damping alloys were mainly focused on Mn content [7], alloy elements [8], heat treatment technology [6], strain amplitude [9] and internal friction mechanism [10][11][12][13]. The studies of internal friction mechanism of Fe-Mn based alloys were in two ranges.…”