高碳钢丝拉拔过程中的组织性能演变  

Evolution of Microstructure and Properties for High Carbon Steel Wire During Drawing

作　　者：瞿熙 鲍思前[1] 赵刚[1] 黄芳玉 贺萌 张帆[1] QU Xi;BAO Siqian;ZHAO Gang;HUANG Fangyu;HE Meng;ZHANG Fan(School of Materials and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081

出　　处：《材料科学与工程学报》2021年第6期937-942,共6页Journal of Materials Science and Engineering

基　　金：国家重点研发计划重点基础材料技术提升与产业化重点资助项目(2017YFB0304800)。

摘　　要：研究了拉拔及镀锌过程中珠光体钢丝的微观组织及力学性能的演变规律,并分析了强化机理和镀锌过程渗碳体的球化机理。研究表明:初始高碳盘条中珠光体片层随机排列,存在强度较弱的<110>纤维织构;铁素体和渗碳体两相在拉拔过程中协同变形,随着拉拔应变量的增加,随机取向的珠光体片层通过偏转和扭折变形逐渐形成平行于拉拔方向的显微状组织,位错密度逐渐增高,渗碳体和铁素体的片层间距逐渐减小,晶粒尺寸减小形成细晶强化效应,随着拉拔过程<110>织构强度逐步增强,钢丝的抗拉强度、屈服强度、显微硬度均快速上升;与拉拔钢丝相比,镀锌钢丝渗碳体部分球化,<110>织构强度稍有减弱,导致钢丝的抗拉强度、屈服强度、显微硬度均有所下降。The tensile strength test and microhardness test were performed to study the mechanical properties of the steel wire,and the strengthening mechanism during the drawing process and the spheroidizing mechanism of the cementite during the galvanizing process were analyzed.The results show that the pearlite layers in the initial high carbon wire rod are randomly arranged,and there is a weak<110>fiber texture.The ferrite and cementite phases are synergistically deformed during the drawing process.With the increase of the drawing strain,the randomly oriented pearlite layer gradually forms a microstructure which is parallel to the drawing direction by deflection and kink deformation.The dislocation density is gradually increased,and the size of the ferrite and cementite layers is gradually reduced,which acts as a fine-grained strengthening.As the<110>texture strength is gradually increased,the tensile strength,yield strength,and transverse micro-hardness of the steel wire increase rapidly.In contrast,the galvanized steel is partially spheroidized,and the<110>texture strength is slightly weakened,resulting in a decrease in the tensile strength,yield strength,and microhardness of the steel wire.

关 键 词：桥索钢 冷拉拔 微观组织 织构 力学性能 

分 类 号：TG142.31[一般工业技术—材料科学与工程]