锻压技术

Al-Zn-Mg-Cu高强铝合金等温多向自由锻组织性能研究

英文标题：Research on microstructure and properties of high strength aluminum alloy Al-Zn-Mg-Cu in isothermal multi-axial open-die forging

作者：赵晓东王亮喻征陈慧琴刘建生

单位：太原科技大学北京航空材料研究院

关键词：Al-Zn-Mg-Cu高强铝合金厚板锻件等温多向自由锻造组织性能

分类号：TG146

出版年,卷(期):页码：2015,40(9):1-6

摘要：

针对高强铝合金在多向自由锻造过程中存在热锻开裂严重及组织不均匀等问题，采用不同锻造工艺对新型Al-Zn-Mg-Cu高强铝合金进行等温多向锻造实验研究。并对经固溶时效热处理后的厚板锻件试样进行了组织观察与力学性能测试。分析对比了采用不同的变形温度、变形方式和锻比等工艺参数对该合金厚板锻件组织和性能的影响。结果表明：在总锻比达到11~12的条件下，采用420 ℃高温大变形动态再结晶和380 ℃低温大变形静态再结晶的成形工序均可细化锻件晶粒组织，在保持锻件较高强度性能的基础上，可以改善其塑韧性，并且可以适当减少制坯工序、缩短工艺流程和提高生产效率。

For the problems of hot forging crack heavily and uneven microstructure in the multi-axial free forging process of high strength aluminum alloy Al-Zn-Mg-Cu, the isothermal multi-axial forging process was studied under different forging processes. Then, the microstructure and mechanical properties of the forging samples after solid-solution and aging heat treatment were observed and tested. The influences of deformation temperatures, deformation modes and forging ratios on microstructure and properties of the forging were analyzed and compared. The results indicate that when the total forging ratio is up to 11-12, grain refinement in the forging process can be obtained by large deformation dynamic recrystallizatin at a high-temperature of 420 ℃ and then static recrystallization at a low-temperature of 380 ℃ during the forming, which can make the part with higher strength, good plastic and toughness. Meanwhile the process of making billet can also be simplified, then the forming process can be shortened and the productivity can be increased.

基金项目：

国家自然科学基金资助项目（51175361）；山西省科技攻关项目(20110321013-02)；太原市科技明星项目(120247-1)

赵晓东（1978-），男，博士研究生，讲师；通讯作者：陈慧琴（1968-），女，博士，教授

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