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研究了超细晶粒形变热处理钢丝制弹簧的应力松弛性能.试验结果表明,该钢丝弹簧具有较高的应力松弛抗力.在?=800MPa,T=80℃条件下,采用不同工艺制做的弹簧工作10年后的负荷损失率分别为:不经强压处理者为≤7.43%.经过冷强压处理者≤6.24%,经过热强压处理者≤1.86%;较国内某纺织厂现用的摇架簧的负荷损失率降低一半以上.采用TEM分析了松弛前后试样的微观组织.指出松弛过程中,不但存在着位错密度的变化,以及胞状亚结构的形成,微细碳化物的溶解与析出也是松弛过程的一个重要特征.
The stress relaxation behavior of ultrafine-grained heat-treated steel wire spring was studied.The results show that the wire spring has high stress relaxation resistance.When the temperature is T = 80 ℃, the spring made by different technology After 10 years of work, the load loss rates were: ≤7.43% without pressure treatment, ≤6.24% after cold pressure treatment, ≤1.86% after hot pressure treatment. Compared with the existing cradle spring The load loss rate is reduced by more than half.The microstructures of samples before and after relaxation are analyzed by TEM.It is pointed out that not only the change of dislocation density and the formation of cellular sub-structure, but also the dissolution and precipitation of fine carbides during relaxation An important feature of the process.