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本文研究了由Ⅱ。组、65、65Mn 及50CrVA 钢丝制造的压缩螺旋弹簧的应力松弛性能、组织结构及其影响因素。试验结果表明:应力松弛过程可分为两个阶段,在半对数坐标中均为直线型,其通式为:(?),%=a+b (?)。这说明低温应力松弛属于对数蠕变,是回复、应变时效和动态回复的综合效应。第一阶段由回复起主导作用,位错组态和亚结构的变化比较显著,故松弛率较大;第二阶段主要由动态回复所控制,位错亚结构变得比较均匀稳定,故松弛率较小。采用热磁和电强压处理后,由于位错亚结构在较短时间内达到均匀稳定,故只出现松弛过程的第二阶段,从而显著提高了弹簧的抗应力松弛性能,使各种压缩螺旋弹簧的十年载荷损失效率(?)_(10)<5%。Ⅱ。和50CrVA 形变热处理钢丝弹簧的(?)_(10),%分别降低94%和92%。
This paper studies from Ⅱ. Group, 65,65 Mn and 50CrVA steel wire compression coil spring stress relaxation properties, organizational structure and its influencing factors. The experimental results show that the stress relaxation process can be divided into two stages, all of which are linear in semi-logarithmic coordinates. The general formula is: (?),% = A + b (?). This shows that low temperature stress relaxation belongs to logarithmic creep, which is the combined effect of recovery, strain aging and dynamic recovery. The first phase is dominated by the response, the dislocation configuration and sub-structure changes more significant, so the relaxation rate is larger; the second phase mainly controlled by the dynamic response, dislocation substructure becomes more uniform and stable, so the relaxation rate Smaller. Due to the uniform and stable dislocation sub-structure in a relatively short period of time, only the second phase of the relaxation process occurs, which significantly improves the stress relaxation resistance of the spring, so that various compression coil springs Decades load loss efficiency (?) _ (10) <5%. II. And 50CrVA thermomechanical wire spring (?) _ (10), respectively, 94% and 92% lower.