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材料研究学报  2022, Vol. 36 Issue (9): 641-648    DOI: 10.11901/1005.3093.2021.280
  研究论文 本期目录 | 过刊浏览 |
等温处理时间对触变挤压锡青铜轴套的组织和性能的影响
肖寒(), 周瑀杭, 陈磊, 张雄超, 崔鋆昕, 熊迟
昆明理工大学材料科学与工程学院 昆明 650093
Effect of Isothermal Time on Microstructure and Properties of Thixo-extruded Tin Bronze Bushing
XIAO Han(), ZHOU Yuhang, CHEN Lei, ZHANG Xiongchao, CUI Yunxin, XIONG Chi
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
引用本文:

肖寒, 周瑀杭, 陈磊, 张雄超, 崔鋆昕, 熊迟. 等温处理时间对触变挤压锡青铜轴套的组织和性能的影响[J]. 材料研究学报, 2022, 36(9): 641-648.
Han XIAO, Yuhang ZHOU, Lei CHEN, Xiongchao ZHANG, Yunxin CUI, Chi XIONG. Effect of Isothermal Time on Microstructure and Properties of Thixo-extruded Tin Bronze Bushing[J]. Chinese Journal of Materials Research, 2022, 36(9): 641-648.

全文: PDF(20170 KB)   HTML
摘要: 

采用冷轧-等温处理SIMA法(CRITSIMA 法)制备半固态锡青铜坯料并将其挤压成锡青铜轴套,研究了等温处理时间对其微观组织和力学性能的影响。结果表明:随着等温处理时间的延长锡青铜轴套的平均晶粒尺寸随之增大,晶粒的粗化速率为296 μm3/s,形状因子先增大后减小,布氏硬度和延伸率先提高后降低,抗拉强度逐渐降低。在910℃等温15 min的锡青铜轴套其综合性能最高,形状因子为0.74,平均晶粒尺寸为63.56 μm,抗拉强度为368 MPa,延伸率为4.5%,布氏硬度为126 HBW。

关键词 金属材料铜合金等温处理触变挤压微观组织力学性能    
Abstract

Semi-solid tin bronze blanks was prepared by cold rolling-isothermal treatment SIMA method (CRITSIMA method), and then tin bronze bushing parts were extruded. The effect of isothermal treatment time on the microstructure and mechanical properties of thixotropic tin bronze bushing parts is investigated. The results show that with the increase of isothermal treatment time, the average grain size gradually increased, the coarsening rate of solid grain is 296 μm3/s, the shape factor first increased and then decreased, the Brinell hardness first increased and then decreased, the tensile strength gradually decreased, and the elongation first increased and then decreased. The microstructure and comprehensive properties of the tin bronze bushing are the best when kept at 910℃ for 15 min. The shape factor is 0.74, the average grain size is 63.56 μm, the tensile strength is 368 MPa, the elongation is 4.5%, and the Brinell hardness is 126 HBW.

Key wordsmetal materials    copper alloy    isothermal treatment    thixotropic extrusion    microstructure    mechanical properties
收稿日期: 2021-04-29     
ZTFLH:  TG146.1+1  
基金资助:国家自然科学基金(51965028);云南省基础研究计划项目(202001AT070031);昆明理工大学分析测试基金(2019T20100165)
作者简介: 肖寒,男,1981年生,博士
图1  触变成形模具的示意图
图2  拉伸试样的尺寸和取样位置
图3  等温时间不同的锡青铜的金相组织
图4  等温时间不同的锡青铜的晶粒尺寸和形状因子
图5  锡青铜的平均晶粒尺寸D3与等温时间关系的散点图和线性拟合
图6  在触变挤压锡青铜不同位置取样的金相组织
图7  触变挤压锡青铜的XRD谱
图8  触变挤压锡青铜的面扫描图
ElementCuSnP
Point193.844.230.14
Point270.9025.450.20
表1  触变挤压锡青铜中Cu、Sn和P 元素的含量
图9  等温时间不同的锡青铜的布氏硬度
图10  等温时间不同的锡青铜试样的拉伸性能
图11  等温时间不同的锡青铜拉伸断口的形貌
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