∅160 mm非调质钢棒材的显微组织和疲劳性能  

Microstructure and Fatigue Behavior of Non-Quenched-and-Tempered Steel Bar 160 mm in Diameter

作　　者：高华耀 刘栋林 李振华 俞杰 周湛 龚宝声 GAO Huayao;LIU Donglin;LI Zhenhua;YU Jie;ZHOU Zhan;GONG Baosheng(Special Steel Company,Jiangsu Yonggang Group Co.,Ltd.,Zhangjiagang Jiangsu 215628,China;Haitian Plastics Machinery Group Co.,Ltd.,Ningbo Zhejiang 315821,China)

机构地区：[1]江苏永钢集团有限公司特钢公司,江苏张家港215628 [2]海天塑机集团有限公司,浙江宁波315821

出　　处：《上海金属》2023年第5期41-44,49,共5页Shanghai Metals

摘　　要：采用控轧控冷技术生产了直径为160 mm,含0.41%C、0.60%Si、1.41%Mn、0.16%Cr、0.07%V和0.023%Nb(质量分数)的可直接机加工的非调质钢棒材。通过金相检验、疲劳试验和力学性能测定等研究了棒材的显微组织、力学性能和疲劳性能。结果表明:棒材表面至距表面40 mm处的晶粒度为8.5~10.0级,显微组织为珠光体和铁素体,珠光体片层间距为170~220 nm;棒材抗拉强度为1002 MPa,屈服强度为755 MPa,断后伸长率为18%,断面收缩率为48%,棒材距表面25 mm处的疲劳强度为502 MPa。160-mm-diam non-quenched-and-tempered steel bar,containing 0.41%C,0.60%Si,1.41%Mn,0.16%Cr,0.07%V and 0.023%Nb by mass and being enabled to be directly machined,was produced by a controlled rolling and controlled cooling technology.The microstructure,mechanical properties and fatigue behavior of the bar were investigated by means of metallographic examination,mechanical property measurements and fatigue test.The results showed that(a)the grain sizes of region from the surface to 40 mm from the surface in the bar were grade 8.5 to 10.0,the microstructure consisted of pearlite and ferrite,and the lamellar interval of pearlite ranged from 170 to 220 nm,and(b)the bar exhibited mechanical properties such as tensile strength of 1002 MPa,yield strength of 755 MPa,elongation of 18%and reduction of area of 48%,and the fatigue strength at 25 mm from the bar surface was 502 MPa.

关 键 词：控轧控冷 非调质钢 疲劳性能 珠光体 片层间距 

分 类 号：TG142.1[一般工业技术—材料科学与工程]