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弹簧广泛地应用于宇航、机械制造、交通运输及仪器仪表等各个行业,随着科学技术的不断发展,要求弹簧在高应力条件下工作能有高的疲劳寿命。目前国内生产的弹簧性能往往满足不了高应力的要求,而要从国外进口一些高应力弹簧。为此,我们采用三次循环快速加热方法,使材料的晶粒达到超细化来提高弹簧在高应力条件下的疲劳寿命。本文介绍了新研制的φ1.6毫米50CrVA 钢丝,经三次循环加热处理后,晶粒度达(ASTM)13～14级,性能为:σ_b=1824兆牛/米~2,ψ≥50%,扭转次数为4次,自缠良好。与同类钢的油淬火处理工艺相比,断裂强度要高196兆牛/米~2,断面收缩率要高5%左右。文中还报道了超细化处理及油淬火处理的钢丝显微组织分析结果。
Springs are widely used in aerospace, machinery manufacturing, transportation and instrumentation and other industries, with the continuous development of science and technology, requiring the spring to work in high stress conditions can have a high fatigue life. Current domestic production of spring performance often can not meet the high stress requirements, but to import some high-stress spring from abroad. To this end, we use three rapid heating cycle method, the grain of the material to achieve ultrafine to improve spring fatigue life under high stress conditions. In this paper, the newly developed φ1.6mm 50CrVA steel wire is introduced. After three cycles of heat treatment, the grain size reaches (ASTM) 13-14. The properties are: σ_b = 1824 MBN / m 2, ψ≥50% Twist the number of 4 times, since the wrap is good. Compared with similar steel oil quenching process, the breaking strength to 196 meg meg per hectare ~ 2, the cross-section shrinkage rate of about 5% higher. The article also reported the results of ultrafine treatment and oil quenching of steel microstructures.