一种消除形状记忆合金弹簧局部超弹性的方法

A Method of Locally Eliminating Superelasticity of Shape Memory Alloy Spring

开发了一套基于硅碳棒的钛镍合金弹簧局部热处理装置,使用此装置对弹簧的局部进行热处理,消除钛镍合金局部超弹性,研究了热处理温度、保温时间对弹簧不同部位显微硬度和组织的影响。结果表明:该装置可以在短时间内将试样加热至700℃以上,在同一预设温度下,热处理目标部位温度上下浮动小于5℃,当温度高于700℃时,在极短的时间内可以消除目标部位的超弹性,并能确保其主体工作部位性能不受热处理的影响。

A heat treatment system was constructed based on a silicon carbide rod in order to locally eliminate the superelasticity of Ti-Ni shape memory alloy spring. The effects of heat treatment temperature,holding time on the hardnesses and microstructure of different parts of spring samples were studied. The results show that the local heat treatment system can heat samples to the temperature above 700 ℃ in a short time,and the temperature fluctuation of the target was less than 5 ℃ at the same preset temperature. This method can effectively eliminate the superelasticity of the target even in a very short time and meanwhile keep the main body of the samples unaffected when the heat treatment temperature was above 700 ℃.