金属橡胶力学特性的热处理工艺影响

Experiment investigation on the effect of heat treatment on metal rubber mechanical properties

针对应用于高温工作环境的金属橡胶的热稳定性问题,结合其冷态成型工艺特征,提出通过去应力退火消除加工残余应力、稳定高温性能的金属橡胶热处理工艺,并以高温合金GH4169制备的金属橡胶为例,通过试验对比研究了热处理工艺对其力学性能的影响.结果表明,去应力退火工艺使金属橡胶构件的刚度提高1.5倍以上,但是对损耗因子几乎没有影响.经过退火处理的金属橡胶构件在高温工作环境下具有稳定的刚度和阻尼性能,并且刚度和阻尼的变化规律受安装约束条件影响.而未经热处理的金属橡胶构件在高温工作条件下将偏离几何尺寸及力学性能的初始设计值.因此,应用于高温环境的金属橡胶阻尼构件为了满足初始设计的力学性能并保持稳定,有必要进行合理的热处理.

The relief annealing was applied to the metal rubber forming process to clear the residual stress in wires and obtain stable mechanical properties.The quasi-static experiments were conducted to study the effect of relief annealing on the metal rubber in both free and precompression conditions.The results show that the stiffness of the metal rubber samples increase by more than 1.5 times after relief annealing while the loss factor change little.For the sample subjected to heat treatment,its stiffness keeps stable in free condition as the operating temperature rising,but increases in the precompression state resulting from the internal thermal expansion stress.The loss factor in both conditions keeps stable with a change less than 10% in the same temperature history.For the samples without heat treatment,the geometric and mechanical properties deviate from the initial values as the temperature rising.So it is concluded that the relief annealing is necessary for the metal rubber to obtain stable geometric and mechanical characteristics in high operating temperature.