奥氏体化前预变形对低碳微合金纳米钢组织和性能的影响  

Effect of pre-deformation before austenization on microstructure and properties of low carbon microalloyed nano steel

作　　者：刘红亮 唐恩 林鹏 张瑞 袁清[5] Liu Hongliang;Tang En;Lin Peng;Zhang Rui;Yuan Qing(Natural Steel Group Co.,Ltd.,Wenzhou Zhejiang 325000,China;Zhejiang Industry&Trade Vocational College,Wenzhou Zhejiang 325000,China;Department of Materials and Building Engineering,Hebei Institute of Mechanical and Electrical Technology,Xingtai Hebei 054000,China;Xingtai Mold Material Technology Innovation Center,Xingtai Hebei 054000,China;State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan Hubei 430081 China)

机构地区：[1]大自然钢业集团有限公司,浙江温州325000 [2]浙江工贸职业技术学院,浙江温州325000 [3]河北机电职业技术学院材料与建筑工程系,河北邢台054000 [4]邢台市模具材料技术创新中心,河北邢台054000 [5]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081

出　　处：《金属热处理》2024年第7期301-306,共6页Heat Treatment of Metals

基　　金：温州市基础工艺项目(G2023068);杭钢集团项目(2023ZR01);浙江工贸引进人才项目(YJRC202305)。

摘　　要：在常规冷轧+退火制备低碳纳米钢工艺的基础上增加奥氏体化前预变形处理,从组织、析出和性能分析了奥氏体化前预变形对低碳微合金纳米钢的影响。结果表明,在常规冷轧+退火工艺基础上采用奥氏体化前预变形制备的纳米钢抗拉强度为1043.1MPa,延伸率为6.1%。其强度相比原始粗晶态钢提升524.5MPa,延伸率急剧下降。奥氏体化前预变形+冷轧+退火工艺可以得到纳米级别的铁素体晶粒,且不会影响NbC析出颗粒的作用,因此可以保证纳米钢的强度,而延伸率下降的主要原因是奥氏体前预变形为晶界处的渗碳体颗粒提供缺陷能,促进晶界处渗碳体发生粗化,恶化晶界强度。此外,晶界处粗化的渗碳体缺少钉扎几何必需位错的能力。Pre-deformation before austenitizing was added into the conventional cold-rolling and annealing process to prepare low carbon nano steel.The effect of pre-deformation on microstructure,precipitation and properties of the low carbon microalloyed nano steel was analyzed.The results show that based on the conventional process the tensile strength and elongation of the nano steel prepared through pre-deformation before austenizing is 1043.1 MPa and 6.1%,respectively.Compared with the original coarse-structured steel,the strength increases by 524.5 MPa and the elongation decreases sharply.By the process of pre-deformation before austenizing+cold-rolling+annealing nano-sized ferrite grains can be obtained without affecting the precipitation of NbC particles,so the strength of the nano steel is guaranteed.However,the main reason for the decrease of elongation is that the pre-deformation provides defect energy for cementite particles at grain boundaries,which promotes the coarsening of cementite and deteriorates the strength of grain boundaries.In addition,coarsened cementite at grain boundaries lack the ability to pin geometrically necessary dislocations.

关 键 词：预变形 纳米结构 显微组织 拉伸性能 析出 

分 类 号：TG142.1[一般工业技术—材料科学与工程]