摘要
研究了轧后直接淬火+回火(DQ&T)与传统轧后离线淬火+回火(ST&T)工艺对Cu沉淀强化超高强度钢力学性能和显微结构的影响,揭示了Cr含量(0.6wt%和1.6wt%)对该Cu沉淀强化钢强韧性的影响机制。结果表明:DQ&T工艺在不损失韧性的情况下显著提升了该钢的强度和加工硬化能力,这主要是由于热轧后淬火保留的高密度位错提高了抗拉强度,同时促进了Cu沉淀相的弥散析出。在相同DQ&T工艺下,高Cr钢(1.6wt%Cr)的屈服强度较低Cr钢(0.6wt%Cr)提高50~70 MPa,且-20℃冲击功也显著提升。这主要是由于Cr元素提高了淬透性获得了更多的板条马氏体组织,同时促进了Cr/Mo的M2C碳化物析出,增强二次硬化能力,提高了韧性。
The influence of direct quenching+tempering(DQ&T)and conventional solution treatment+tempering(ST&T)processes on the mechanical properties and microstructure of Cu precipitation-strengthened ultra-high-strength steel was systematically investigated.And the influence mechanism of Cr content(0.6wt%and 1.6wt%)on the strength and toughness of the Cu precipitation-strengthened steel was revealed.The results show that the DQ&T process significantly enhances strength and work-hardening capacity without compromising toughness,which is primarily attributed to the preservation of high-density dislocations from hot rolling+quenching,which improves tensile strength,while simultaneously promotes finely dispersed Cu precipitate formation.Under the identical DQ&T conditions,the high-Cr steel(1.6wt%Cr)exhibits 50-70 MPa higher yield strength and impact toughness at -20℃ significantly improves compared to low-Cr steel(0.6wt%Cr).This is mainly due to the fact that the Cr element improves the hardenability,resulting in more lath martensite structure,and the precipitation of Cr/Mo enriched M2C carbides is promoted,which enhances the secondary hardening ability and improves the toughness.
作者
钱江
李彤
刘健
魏兴豪
QIAN Jiang;LI Tong;LIU Jian;WEI Xinghao(Naval Armament Department,Beijing 100036,China;National Key Laboratory of Marine Corrosion and Protection,The 725th Research Institute of CSSC,Luoyang 471023,China)
出处
《热加工工艺》
北大核心
2025年第23期180-185,197,共7页
Hot Working Technology
基金
国家重点研发计划项目(2022YFB4601902)。
关键词
Cu沉淀强化钢
直接淬火
回火
固溶
Cu precipitation-strengthened steel
direct quenching
tempering
solid solution
