摘要
为了了解Fe-Mn基阻尼合金的高温阻尼性能,用真空感应电炉的方法制备了Fe-14.04Mn-0.22C合金.用倒扭摆内耗仪测试了环境温度在23-400℃变化时合金阻尼性能的变化规律,并用热机械分析仪和光学显微镜分析了合金的组织结构及其相变特点.研究结果表明,在常温条件下合金的阻尼性能随扭转应变的增加而呈线性方式增加,扭转应变在1×10-4时,对数衰减率达0.1,且没有出现峰值;随着环境温度的变化,对数衰减曲线与应变的线性关系没有发生改变,但是曲线发生了整体的上下平移;当环境温度低于200℃时,合金的阻尼性能随温度的升高而增加,但当温度达到或超过200℃后,合金的阻尼性能迅速下降,其原因在于合金发生了奥氏体转变(As为270℃),马氏体的百分含量降低,阻尼源减少.
The damping capacity of Fe - 14. 04Mn -0. 22C alloy from 23 ℃ to 400 ℃ was measured with reversal torsion machine, the alloy microstructure was observed with optical microscopy, and phase-transformation and its influence on damping capacity were investigated by TMA device. The experimental results show that the damping capacity increases lineally with the torsion strain. The maximum of logarithmic decrement reaches 0. 1 when the torsion strain value is 1 × 10^-4. There is no damping peak during this process. The lineal character of logarithmic decrement curve also keeps up as the ambient temperature increases, but the curve entirely moves up or down at different temperatures. From 23℃ to 200 ℃, the damping capacity increases with the ambient temperature ; on the other hand, when the temperature is over 200 ℃, the damping capacity decreases dramatically because the austenite transformation occurs at about 270 ℃.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2007年第1期76-78,共3页
Materials Science and Technology
