东北大学学报（自然科学版）

东北大学学报（自然科学版） ›› 2022, Vol. 43 ›› Issue (12): 1769-1776.DOI: 10.12068/j.issn.1005-3026.2022.12.014

• 材料与冶金 • 上一篇    下一篇

真空离心铸造冷却速率对7055铝合金组织和力学性能的影响

王胤1,2， 李勇1， 钱晓明3， 张博四1   

  1. (1. 东北大学 轧制技术及连轧自动化国家重点实验室， 辽宁 沈阳110819； 2. 东北大学 材料电磁过程教育部重点实验室， 辽宁 沈阳110819； 3.燕山大学 国家冷轧板带装备及工艺工程技术研究中心， 河北 秦皇岛066004)
  • 发布日期:2022-12-26
  • 通讯作者: 王胤
  • 作者简介:王胤(1996 - )，男，辽宁阜新人，东北大学博士研究生； 李勇(1979 - )，男，湖北十堰人，东北大学副教授，博士生导师.
  • 基金资助:
    山东省重点研发计划项目(2019JZZY010401); 南宁市科技重大专项(20201041); 中央高校基本科研业务费专项资金资助项目(N2007008).

Effect of the Cooling Rate of Vacuum Centrifugal Casting on Microstructure and Mechanical Properties of 7055 Aluminum Alloy

WANG Yin1,2， LI Yong1， QIAN Xiao-ming3， ZHANG Bo-si1   

  1. 1. State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， China; 2. Key Laboratory of Electromagnetic Processing of Materials， Ministry of Education， Northeastern University， Shenyang 110819， China; 3. National Cold Rolling Strip Equipment and Process Engineering Technology Research Center， Yanshan University， Qinhuangdao 066004， China.
  • Published:2022-12-26
  • Contact: LI Yong
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摘要： 采用真空离心铸造技术制备了7055铝合金铸管，通过添加中间包进行保温来改变合金凝固冷却速率，并对铸管进行组织和性能测试.结果表明，冷却速率较慢的1#铸管组织分布不均，其晶粒沿着外、中、内层由等轴晶逐渐变为粗大树枝晶，且晶粒间分布着更多的第二相；而冷却速率较快的2#铸管组织均为细小的等轴晶，且分布着少量的第二相.经过均匀化后，两种铸管的第二相分布数量由外、中、内层逐渐增多，且1#铸管残余的第二相数量更多;合金硬度值较铸态时有所增大，但2#铸管硬度值增大幅度更大，拉伸性能优于1#铸管.

关键词: 真空离心铸造；7055铝合金；冷却速率；微观组织；力学性能

Abstract: Casting tubes of 7055 aluminum alloy were prepared by the vacuumed centrifugal casting technology. The cooling rate of the casting was changed by the addition of the tundish and the corresponding microstructure and mechanical properties of the alloys were studied. The results show that the microstructure of the casting tube sample with the slow cooling rate(Casting tube 1#) is unevenly distributed. The grains change from the equiaxed grains to the coarse dendritic ones along the solidification direction of the cross-section plane， and some second phases are distributed at the grain boundaries. However， the microstructure of the casting tube sample with the fast cooling rate(Casting tube 2#)consists of the fine equiaxed grains and a small amount of second phases. After homogenization process， the amount of second phases along the solidification direction in both samples increase gradually， and the second phases of Casting tube 1# is greater， while the hardness increment and the tensile properties of Casting tube 2# is higher.

Key words: vacuum centrifugal casting; 7055 aluminum alloy; cooling rate; microstructure; mechanical properties

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