论文部分内容阅读
本文研究了强压处理对50C_rVA油淬火钢丝及形变热处理们丝弹簧的组织结构及松弛性能的影响。结果表明,经热或电强压处理后TEM组织是回火板条马氏体,其主要特征是:在某些晶粒微区内出现了黑白相间、大致平行的条状亚结构,其中白条为合金铁素体,窄细条是高位错密度缠结的胞壁,碳化物质点主要分布在胞壁内。形变热处理者有数量较多、黑色密集位错缠结的胞状组织,局部也有类似孪晶的亚结构。未强压时弹簧的低温应力松弛过程一般分为两阶假;经热或电强压处理后只出现松弛的第二阶段。回归直线方程通式为ΔP/P_0=a+blntR,算出两类弹簧工作十年后的负荷损失率<2%。弹簧的低温应力松弛是一个回复和动态回复的综合效应,它在某些晶粒较弱的微区内优先进行。组织和亚结构的均匀稳定是主要影响因素
In this paper, the effect of high pressure treatment on microstructure and relaxation properties of 50C_rVA oil-quenched steel wire and deformed heat-treated wire spring was studied. The results show that the TEM microstructure is tempered lath martensite after heat or electric stress treatment. The main features of the TEM microstructure are: black and white phase and parallel strip-like substructure in some grain regions, Alloy ferrite, narrow strip is a high dislocation density entangled cell wall, carbide particles are mainly distributed in the cell wall. Deformation heat treatment has a large number of dense black dislocation-entangled cells, the local twin structure is also similar to the sub. The process of low temperature stress relaxation when the spring is not strong is generally divided into two stages of false; the second stage of relaxation after heat or electric pressure treatment. Regression equation of the general formula for the ΔP / P_0 = a + blntR, calculate the two types of spring ten years after the work load loss rate <2%. The low temperature stress relaxation of a spring is a combined effect of recovery and dynamic recovery, which preferentially occurs in some of the weaker domains. The uniform and stable organization and sub-structure are the main influencing factors