冷拉拔变形量对铜银合金线材组织性能的影响  

Effect of cold drawing deformation on microstructure and properties of copper-silver alloy wire

作　　者：孔令宝 周延军[1,2] 宋克兴[1,2] 封存利 曹军[4] 李周[5] 王强松 解浩峰 皇涛[1,2] 张朝民 程楚 李韶林[1,2] KONG Ling-bao;ZHOU Yan-jun;SONG Ke-xing;FENG Cun-li;CAO Jun;LI Zhou;WANG Qiang-song;XIE Hao-feng;HUANG Tao;ZHANG Chao-min;CHENG Chu;LI Shao-lin(College of Material Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Provincial and Ministerial Co-construction Collaborative Innovation Center of Nonferrous New Materials and Advanced Processing Technology,Henan University of Science and Technology,Luoyang 471023,China;Henan Senger Materials Technology Co.,Ltd.,Jiaozuo 454010,China;School of Mechanical and Power Engineering,Henan Polytechnic University,Jiaozuo 454000,China;School of Materials Science and Engineering,Central South University,Changsha 410083,China;GRIMAT Engineering Institute Co.,Ltd.,Beijing 101407,China)

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]河南科技大学有色金属新材料与先进加工技术省部共建协同创新中心,河南洛阳471023 [3]河南森格材料科技有限公司,河南焦作454010 [4]河南理工大学机械与动力工程学院,河南焦作454000 [5]中南大学材料科学与工程学院,湖南长沙410083 [6]有研工程技术研究院有限公司,北京101407

出　　处：《塑性工程学报》2020年第12期138-143,共6页Journal of Plasticity Engineering

基　　金：国家重点研发计划项目(2016YFB0301400);河南省创新引领专项(191110210400);河南省高等学校重点科研项目(19A430012);洛阳市科技重大专项(1901006A);河南省杰出人才创新基金资助项目(182101510003)。

摘　　要：对热型水平连铸制备的Cu-0.52Ag-0.22Cr铸态杆坯进行拉拔塑性变形(Φ16.00 mm→Φ6.00 mm)和时效热处理(450℃×2 h)后,进一步对Φ6 mm时效态试样进行了不同变形量(59.7%、75.0%、85.3%和95.3%)的拉拔塑性变形(Φ6.00 mm→Φ3.80 mm→Φ3.00 mm→Φ2.30 mm→Φ1.33 mm)。研究了不同拉拔变形量对时效态Cu-0.52Ag-0.22Cr合金微观组织、导电率和抗拉强度的影响规律。结果表明,Cu-0.52Ag-0.22Cr合金在冷变形过程中横截面组织由四周向内部产生不均匀变化,在纵截面上表现为沿轴向不断细化的条状纤维组织;随着变形量增大,合金导电率不断降低,抗拉强度先上升后降低;当冷变形量为75.0%时,合金导电率保持在较高水平87.3%IACS,同时,峰值抗拉强度达到559 MPa。在此情况下,合金力学性能的大幅提升主要取决于该过程中加工硬化效果显著。进一步增加总变形量,加工硬化效果下降,导致合金导电率和力学性能降低。Plastic deformation(Φ16.00 mm→Φ6.00 mm)and aging heat treatment(450℃×2 h)were carried out on Cu-0.52 Ag-0.22 Cr cast rod billet obtained by hot horizontal continuous casting,and the aged samples with the size ofΦ6.00 mm were further subjected to drawing plastic deformation(Φ6.00 mm→Φ3.80 mm→Φ3.00 mm→Φ2.30 mm→Φ1.33 mm)with different deformation amounts(59.7%,75.0%,85.3%and 95.3%).The effect law of different drawing deformation amounts on the microstructure,electrical conductivity and tensile strength of Cu-0.52 Ag-0.22 Cr alloy at aging state was studied.The results show that the microstructure on cross-section of Cu-0.52 Ag-0.22 Cr alloy in cold deformation process produces uneven changes from the surrounding to the inside,and on the longitudinal section,it appears as strip fiber structure with continuous thinning along axial direction;with the increase of deformation amount,the electrical conductivity of alloy decreases,but the tensile strength first increases and then decreases;when the cold deformation amount is 75.0%,the electrical conductivity of alloy remains at a high level of 87.3%IACS,while the peak tensile strength reaches 559 MPa.In this case,the significant improvement of the mechanical properties of the alloy mainly depends on the remarkable effect of work hardening in this process.With the further increase of the total deformation,the effect of work hardening decreases,leading to the decrease of the electrical conductivity and mechanical properties of alloy.

关 键 词：铜银合金 拉拔变形 导电率 抗拉强度 微观组织 

分 类 号：TG146.1[一般工业技术—材料科学与工程]