摘要
含Cu低合金钢是一类重要的低碳低合金高强钢,其通过Cu析出弥补低碳当量的强度降低,兼顾高强度以及良好的焊接性能、低温韧性和耐腐蚀性能,具有优良的综合应用价值。综述了含Cu低合金钢中与Cu析出有关的国内外研究进展,以时效过程中含Cu低合金钢硬度的变化曲线为例,阐明其材料力学性能的变化趋势,并总结了基于沉淀强化机制的Cu析出对应的强化增量公式;梳理了时效过程中Cu析出的演变过程,包括相变、晶体结构转变及与Cu析出相尺寸相关的数学模型;汇总了含Cu低合金钢中常添加的合金元素及合金元素对含Cu低合金钢的作用。最后,对新一代含Cu低合金钢的发展进行展望,指出通过优化理论模型和加入以Ni元素为主的合金元素调控Cu析出尺寸及分布,是制备性能更优含Cu低合金钢的重要手段。
Cu-bearing low-alloy steel is a kind of important low-carbon low-alloy high-strength steel.It has excellent comprehensive application value by making up for the strength reduction of low-carbon equivalent through Cu precipitation,taking into account high strength,good welding performance,low temperature toughness and corrosion resistance.The research progress of Cu precipitation in Cu-bearing low-alloy steel at home and abroad is reviewed.Taking the hardness change curve of Cu-bearing low-alloy steel during aging treatment as an example,the change trends of mechanical properties for materials are clarified,and the strength increment formula corresponding to Cu precipitation based on precipitation strengthening mechanism is summarized.The evolution process of Cu precipitation during aging treatment is sorted out,including phase transformation,crystal structure transformation and mathematical model related to the size of Cu precipitated phase.The common added alloying elements in Cu-bearing low-alloy steel and the effect of alloying elements on Cu-bearing low-alloy are summarized.Finally,the development for new generation of Cu-bearing low-alloy steel is prospected.It is pointed out that regulating the size and distribution of Cu precipitation by optimizing the theoretical model and adding Ni-based alloying elements is an important means to prepare Cu-bearing low-alloy steel with better performance.
作者
梁丰瑞
苏航
柴锋
孙铭璇
LIANG Fengrui;SU Hang;CHAI Feng;SUN Mingxuan(Research Institute of Engineering Steels,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China;Metallurgical Technology Institute,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China)
出处
《中国冶金》
CAS
CSCD
北大核心
2023年第11期29-38,共10页
China Metallurgy
关键词
含Cu低合金高强钢
时效
富Cu相
沉淀强化
合金元素
Cu-bearing low-alloy high-strength steel
aging treatment
Cu-rich phase
precipitation strengthening
alloy element
