预轧-退火对Cu-7.5Sn-0.1P带材组织与力学性能的影响  

Effect of pre-rolling-annealing on microstructure and mechanical properties of Cu-7.5Sn-0.1P strip

作　　者：林志霖 刘媛 罗金宝 张青科 宋振纶 谭大鹏[1] 巢国辉 许赪 LIN Zhilin;LIU Yuan;LUO Jinbao;ZHANG Qingke;SONG Zhenlun;TAN Dapeng;CHAO Guohui;XU Cheng(College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310014,China;Key Laboratory of Advanced Marine Materials,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China;Ningbo Jintian Copper(Group)Co.,Ltd.,Ningbo 315336,China)

机构地区：[1]浙江工业大学机械工程学院,杭州310014 [2]中国科学院宁波材料技术与工程研究所,海洋关键材料重点实验室,宁波315201 [3]宁波金田铜业(集团)股份有限公司,宁波315336

出　　处：《中国有色金属学报》2024年第9期2955-2965,共11页The Chinese Journal of Nonferrous Metals

基　　金：宁波市2025科技创新重大项目(2021Z032)。

摘　　要：本研究对铸态Cu-7.5Sn-0.1P合金进行预轧再退火,并采用XRD、OM、SEM、EDS、EPMA和拉伸测试等方法,研究预轧变形量和退火温度对合金的微观组织和力学性能的影响。结果表明:对于预轧的Cu-7.5Sn-0.1P合金而言,预轧变形造成枝晶结构的破碎,有利于锡偏析组织在较低退火温度下的消除。与直接退火的合金相比,预轧-退火处理的合金晶粒尺寸小,强度高,还保持了良好的塑性变形能力。预轧-退火的合金经冷轧、去应力退火最终制得0.2 mm厚的成品带材,与常规工艺制备的相似厚度和成分的锡磷青铜带材相比,其强度显著提高并保持较好的塑性,其中,对应于预轧变形量为44%、退火温度为620℃的合金带材的抗拉强度与伸长率分别达到1005 MPa和19.3%。The cast Cu-7.5Sn-0.1P alloys were pre-rolled followed by homogenization annealing,and investigated using XRD,OM,SEM,EDS,EPMA and tensile testing,etc.The effects of pre-rolling deformation and annealing temperature on the microstructure and mechanical properties of the alloys were studied.The results show that the pre-rolling can lead to fragmentation of dendrite structure of the Cu-7.5Sn-0.1P alloy,which may promote the elimination of Sn segregation structure at lower annealing temperature.By comparison with the alloy subjected to direct annealing,the pre-rolled-annealed alloy has finer grain size,higher strength and maintains good plastic deformation capability.The final 0.2 mm thick finished strip produced by cold rolling of the pre-rolling-annealing alloy with 44%deformation is significantly higher in strength and maintains better plasticity by comparison with strips prepared by common procedures.The tensile strength and elongation for the finished strip made from the pre-rolling-annealing alloy with 44%deformation reach 1005 MPa and 19.3%,respectively.

关 键 词：锡磷青铜 预轧 退火 微观组织 力学性能 

分 类 号：TG146.1[一般工业技术—材料科学与工程]