摘要
无铅铋黄铜具有良好的导电导热性、弹性和切削性能,是5G手机精密光学镜头用垫片的首选材料。本研究对热挤压态铋黄铜合金进行旋锻加工,研究了旋锻总变形量和道次变形量对合金的微观组织、力学性能和切削性能的影响,对比了旋锻-退火与拉拔-退火工艺制备的合金棒材成品的切削性能。结果表明:旋锻变形可以细化晶粒和破碎铋相颗粒,随着旋锻总变形量升高,晶粒和铋相尺寸降低,强度和硬度升高。与拉拔-退火的合金相比,旋锻-退火后组织中晶粒尺寸和铋相平均尺寸均较小,且铋相在晶界上无明显聚集。采用三道次旋锻至31%变形再退火制得的铋黄铜棒材成品切削后所得的切屑中短切屑占比高,切削后表面粗糙度<1μm,体现出显著的切削性能提升。
The lead-free Bi-brass has good conductivity,elasticity and machinability,and is the most preferred material for 5G camera lens gaskets.In this study,the as-extruded Bi-brass was processed by swaging and the effect of swaging deformation and passage deformation on its microstructure,mechanical properties and machinability has been investigated.Especially,the machinability of lead-free Bi-brass subjected to swaging followed by annealing was discussed by comparison with the alloy by drawing followed by annealing.The results show that swaging can refine grains and breakup Bi particles,and the grain refinement and precipitate breakup are more significant with the increasing of total swaging strain,leading to the increase of tensile strength and hardness.Compared with the alloy by drawing-annealing,the alloy by swaging-annealing achieves finer grains and Bi particles,and no aggregation of Bi phase on the grain boundaries.The final Bi-brass rods processed by three passes of swaging reach up to 31%strain,and annealing exhibits high fraction of short cutting chips and a machining surface roughness of<1μm,showing significant improvement in machinability.
作者
茅豪杰
冯斌
张青科
卢翔
宋振纶
谭大鹏
许赪
MAO Haojie;FENG Bin;ZHANG Qingke;LU Xiang;SONG Zhenun;TAN Dapeng;XU Cheng(College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310014,China;State Key Laboratory of Advanced Marine Materials,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China;Ningbo Xingaoda Metals Co.,Ltd.,Ningbo 315175,China)
出处
《中国有色金属学报》
北大核心
2025年第9期3032-3047,共16页
The Chinese Journal of Nonferrous Metals
基金
宁波市2025科技创新重大项目(2022Z104)
东北大学数字钢铁全国重点实验室开放课题基金资助项目(2023RALKFKT009)。
关键词
铋黄铜
旋锻
铋相
微观组织
切削性能
Bi-brass
swaging
Bi phase
microstructure
cutting performance
作者简介
通信作者:许赪,研究员,博士,电话:0574-86685893,E-mail:xucheng@nimte.ac.cn。
