锻压技术

2219铝合金固溶处理晶粒异常长大现象分析

英文标题：Analysis on abnormal grain growth for 2219 aluminum alloy treated by solution treatment

分类号：TG146.2

出版年,卷(期):页码：2019,44(9):156-159

摘要：

针对新一代运载火箭贮箱用2219铝合金，当预拉变形量较大时（预拉变形量为5%），固溶淬火过程中就会产生晶粒异常长大现象，针对固溶处理过程中晶粒产生异常长大问题，采用原位观察的方法，分析晶粒长大情况。结果表明：当预拉变形量达到5%时，固溶温度低于525 ℃，晶粒长大困难；当固溶温度达到525 ℃后，晶粒瞬时、迅速长大；当固溶温度达到535 ℃并且经保温6 min后，晶粒长大到原晶粒尺寸的几倍以上，同时，长大后的晶粒尺寸差别更大。这种晶粒长大现象与2219铝合金板材中含有大量第二相强化粒子θ相及晶界元素偏聚有关。

When the pre-tension deformation was large (pre-tension deformation of 5%)，2219 aluminum alloy for the new generation of launch vehicle tanks occured abnormal grain growth during solution quenching process. In order to solve the problem of abnormal grain growth during solution treatment, the situ observation method was used to analyze the grain growth. The result shows that when the pre-tension deformation is 5% and the solution temperature is lower 525 ℃, the grain growth is difficult, and when the solution temperature is up to 525 ℃, the grains grow rapidly and instantaneously. However, when the solution temperature reaches 535 ℃ and keeps for 6 min, the grain size is several times larger than the original grain size. At the same time, the difference in grain sizes after growing up is greater. This grain growth phenomenon is related to the large number of the second phase strengthening particle θ phase and grain boundary element segregation in 2219 aluminum alloy sheet.

基金项目：

天津市科技支撑项目（17YFZCGX00530）

李继光（1981-），男，博士，高级工程师 E-mail：jiguangli2008@126.com

参考文献：

［1］O’donnell M, Leacock A G, Banabic D, et al. The effect of pre-strain and solution heat treatment on the formability of a 2024 aluminium alloy
［J］. International Journal of Material Forming, 2008, 1(S1): 257-260.

［2］O’donnell M, Banabic D, Leacock A G, et al. The effect of pre-strain and inter-stage annealing on the formability of a 2024 aluminium alloy
［J］. International Journal of Material Forming, 2008, 1(S1): 253-256.

［3］Wang H, Yi Y, Huang S. Influence of pre-deformation and subsequent ageing on the hardening behavior and microstructure of 2219 aluminum alloy forgings
［J］. Journal of Alloys and Compounds,2016，685：941-948.

［4］姚君山, 周万盛, 王国庆, 等. 航天贮箱结构材料及其焊接技术的发展
［J］. 航天制造技术, 2002, (5)：17-22.

Yao J S, Zhou W S, Wang G Q, et al. The development of structure materials and their welding technology of space vehicle propellant tanks
［J］. Aerospace Manufacturing Technology, 2002, (5)：17-22.

［5］Lu Y, Wang J, Li X, et al. Effect of pre

-deformation on the microstructures and properties of 2219 aluminum alloy during aging treatment
［J］. Journal of Alloys and Compounds,2017，699：1140-1145.

［6］Rajakumar S, Christopher T. Fracture strength of centre surface cracked tensile specimens made of 2219-T87 Al alloy welding
［J］. Transactions of Nonferrous Metals Society of China, 2011, 21(12):2568-2575.

［7］徐崇义, 李念奎. 2xxx 系铝合金强韧化的研究与发展
［J］. 轻合金加工技术, 2005, 38(8)：13-17.

Xu C Y, Li N K. Development and research of strengthening and toughening of 2xxx aluminium alloy
［J］. Light Alloy Fabrication Technology，2005, 33(8)：13-17.

［8］崔忠圻. 金属学与热处理
［M］. 北京:机械工业出版社，1999.

Cui Z Q. Metallography & Heat Treatment
［M］. Beijing: China Machine Press, 1999.

［9］王昆, 万敏. 铝合金拉形粗晶临界预应变曲线的建立及应用
［J］. 北京航空航天大学学报，2013，39(4)：508-511.

Wang K, Wan M. Determination and application of coarse-grain critical pre-strain curve to aluminium alloy stretch forming
［J］. Journal of Beijing University of Aeronautics and Astronautics, 2013, 39(4)：508-511.

［10］李丁, 刘旭东. 蒙皮零件拉伸粗晶的控制研究
［J］. 航空制造技术，2011，（18）：89-91.

Li D, Liu X D. Research of controlling coarse-grain of stretching skin part
［J］. Aeronautical Manufacturing Technology, 2011, (18)：89-91.

［11］李小强, 李东升, 周贤宾，等. 预变形对LY12 铝合金板热处理后晶粒度的影响
［J］. 材料科学与工艺，2010，18(2)：238-241.

Li X Q, Li D S, Zhou X B, et al. The effect of predeformation on the grain size of LY12 aluminium alloy sheet after heat treatment
［J］. Material Science and Technology, 2010，18(2)：238-241.

［12］万李, 杨浩亮, 丁鹏飞, 等. 2219 铝合金带筋条板材蠕变时效成形试验研究
［J］. 航天制造技术, 2014，8(4)：36-38.

Wan L, Yang H L, Ding P F, et al. Study on the creep age forming of iso-grid panel of 2219
［J］. Aerospace Manufacturing Technology, 2014，8(4)：36-38.

服务与反馈：

【文章下载】【加入收藏】