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55SiMnVB钢经遗传工艺(高温形变火淬-软化回火-二次淬火+中温回火)处理后,与常规热处理相比,抗拉强度提高20％,断面收缩率提高20～30％。经预应力喷丸后的单片疲劳寿命普遍接近一百万次,该钢具有明显的遗传强化效果。经初步探讨,认为经遗传工艺处理的55SiMnVB钢具有一定的遗传强化效果的原因是由于形变诱发碳化物析出,Ms点升高,板条马氏体增多并细化,形变诱发析出较为稳定的弥散分布的碳化物,对于形变造成的大量位错起钉扎作用形成较为稳定的位错网络。
Compared with the conventional heat treatment, the tensile strength of 55SiMnVB steel increased by 20% and the reduction of area reduced by 20-30% after genetic treatment (high temperature deformation quenching - softening tempering - secondary quenching + tempering). After prestressed peening monolithic fatigue life is generally close to one million times, the steel has a significant genetic strengthening effect. After preliminary study, it is considered that the genetic strengthening effect of the 55SiMnVB steel treated by genetic engineering is due to the deformation-induced carbide precipitation, the increase of Ms point, the increase and refinement of lath martensite and the more stable dispersion of strain-induced precipitation Distribution of carbides, forming a more stable dislocation network for the pinning effect of a large number of dislocations caused by deformation.