超高强7055铝合金铸锭均匀化工艺优化

doi:10.13251/j.issn.0254-6051.2020.12.016

金属热处理 ›› 2020, Vol. 45 ›› Issue (12): 87-91.DOI: 10.13251/j.issn.0254-6051.2020.12.016

超高强7055铝合金铸锭均匀化工艺优化

晁代义^1,2, 张倩¹, 孙有政², 赵志国², 李辉¹, 吕正风^1,2, 程仁策²

1.烟台南山学院工学院, 山东烟台 265713;
2.山东南山铝业股份有限公司国家铝合金压力加工工程技术研究中心, 山东烟台 265713

收稿日期:2020-07-19 出版日期:2020-12-25 发布日期:2021-01-14
通讯作者: 张倩,讲师,E-mail: 18210297896@163.com
作者简介:晁代义(1986—),男,工程师,主要研究方向为材料组织性能,E-mail:chaodaiyi@nanshan.edu.cn。
基金资助:
山东省重点研发计划(2019GGX102025); 山东省高等学校青创科技计划(2019KJA019)

Optimization of homogenization process of ultra-high strength 7055 aluminum alloy ingots

Chao Daiyi^1,2, Zhang Qian¹, Sun Youzheng², Zhao Zhiguo², Li Hui¹, Lü Zhengfeng^1,2, Cheng Rence²

1. College of Engineering, Yantai Nanshan University, Yantai Shandong 265713, China;
2. National Engineering Research Center for Plastic Working of Aluminium Alloys, Shandong Nanshan Aluminum Co., Ltd., Yantai Shandong 265713, China

Received:2020-07-19 Online:2020-12-25 Published:2021-01-14

摘要/Abstract

摘要： 采用光学显微镜、扫描电镜、差热分析及透射电镜等手段,对一种航空用超高强7055铝合金大尺寸铸锭的均匀化工艺进行分析与优化。提出分级提高均匀化温度的方法,在确保不发生过烧的情况下,最大限度改善铸锭质量。结果显示:低温预均匀化时,铸锭中析出大量的Al₃Zr相,能够大幅度降低对后续挤压变形的再结晶比例;对铸锭采用400 ℃×4 h+465 ℃×16 h+474 ℃×8 h的分级均匀化处理工艺,能够显著消除铸锭中低熔点相的含量,提高铸锭质量,同时相比于原工艺节省约13 h。新的均匀化处理工艺,不仅提高了生产效率,还能够为后续工艺提供良好的铸锭。

关键词: 超高强7055铝合金, 均匀化工艺, Al₃Zr相, 低熔点相

Abstract: Homogenization process of a large size of ultra-high strength 7055 series aluminum alloy for aviation was analyzed and optimized by means of metallographic microscope, scanning electron microscope, differential scanning calorimeter and transmission electron microscope. The method of increasing the homogenization temperature in-step was proposed to improve the ingot quality to the max extent without over-burning. The results show that the recrystallization ratio of subsequent extrusion deformation will be greatly reduced by the precipitation of Al₃Zr phase during pre-homogenization at low temperature. The process of 400 ℃×4 h+465 ℃×16 h+474 ℃×8 h homogenization can significantly eliminate the content of low melting point eutectic phase in ingot and obtain a high quality ingot, meanwhile it can save process time by about 13 h compared with the original process. The new homogenization process not only improves the production efficiency, but also provides a better quality ingot for the subsequent process.

Key words: ultra-high strength 7055 aluminum alloy, homogenization process, Al₃Zr phase, low melting point phase

中图分类号:

TG142.71

晁代义, 张倩, 孙有政, 赵志国, 李辉, 吕正风, 程仁策. 超高强7055铝合金铸锭均匀化工艺优化[J]. 金属热处理, 2020, 45(12): 87-91.

Chao Daiyi, Zhang Qian, Sun Youzheng, Zhao Zhiguo, Li Hui, Lü Zhengfeng, Cheng Rence. Optimization of homogenization process of ultra-high strength 7055 aluminum alloy ingots[J]. Heat Treatment of Metals, 2020, 45(12): 87-91.

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超高强7055铝合金铸锭均匀化工艺优化

Optimization of homogenization process of ultra-high strength 7055 aluminum alloy ingots

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