冷变形和时效温度对扭振时恒弹性合金f_s-T曲线的影响

本文探讨Fe-Ni-Cr-Ti合金在冷变形和时效状态中两种振动模式(扭振和横振)中的f(共振频率)-T(温度)曲线,以及冷变形压下量和时效温度对扭振模式中f_s(扭振共振频率)-T曲线的影响,指出:在冷变形状态的两种振动模式中,其f-T曲线相似但不重合;时效状态时扭振模式中的f_s-T曲线极大值与横振模式中的f_l(横振共振频率)-T曲线极小值所对应的温度移至室温附近,同一材料,随着时效温度升高,在扭振模式下其频率温度系数由正变负,在横振模式下由负变正,扭振模式下,随着冷变形压下量增加或时效温度降低,f_s-T曲线极大值移向高温,可通过调整冷变形压下量和时效温度以控制极大值对应温度,获得较低的频率温度系数值。

Effects of Cold-Rolling Reduction and Ageing Temperature on the Resonant Frequency-Temperature Curve of Constant Elastic Alloy

Investigates the relationship between resonant frequency f and temperature T of the constant elastic alloy Fe-Ni-Cr-Ti with low temperature coefficient on torsional and transversal vibrations, and then discusses the effects of cold-rolling reduction and ageing temperature on the relationship between resonant frequency of torsional vibration fs and temperature T. The two f-T curves of different vibrating modes are proved to be similar but not coincident each other in cold-rolling, and in ageing the respective temperatures corresponding to the maximum of fs-T curve for torsional vibration and the minimum of f1-T curve for transversal vibration are both moving near to the room temperature. As the same materials tested, the frequency temperature coefficient varies from positive to negative with the increasing temperature on torsional vibration, while on transversal vibration it is just the inverse case. With the increasing cold-rolling reduction or the lowering ageing temperature on torsional vibration, the maximum of fs-T curve is moving towards higher temperature. A lower frequency temperature coefficient can be obtained through adjusting the cold-rolling reduction and ageing temperature for controlling the temperature corresponding to maximum.