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本文论述了一种使普通低碳低合金双相钢在提高强度的同时可明显改善塑性的新工艺——二次淬火法,详细论述了各种组织因素对双相钢性能的影响。通过对马氏体尺寸、分布的研究以及对钢微观组织的电子显微镜观察与分析,证实了二次淬火双相钢强度的提高与马氏体体积含量增加有关,而塑性的显著改善与组织的细化和马氏体中的位错增加有关。作者运用合金元素扩散理论对二次淬火双相钢中马氏体组织的变化进行了讨论,并为二次淬火双相钢性能的提高提出了一定的理论依据。
This article discusses a new technology that can significantly improve the ductility of ordinary low-carbon and low-alloy dual-phase steels - the second quenching method. The effects of various microstructures on the properties of dual-phase steels are discussed in detail. Through the study of the size and distribution of martensite and the observation and analysis of the microstructure of the steel by electron microscopy, it was confirmed that the increase of the strength of the secondary quenched dual phase steel is related to the increase of the volume fraction of the martensite, while the plasticity is remarkably improved with that of the microstructure Fining is associated with an increase in dislocation in martensite. The author used the alloying element diffusion theory to discuss the martensite structure change in the secondary quenched dual phase steel and proposed a certain theoretical basis for the improvement of the performance of the secondary quenched dual phase steel.