锻压技术

预热温度对6005A挤压管材组织的影响

英文标题：Influence of preheating temperature on microstructure of 6005A extruded tube

作者：孙磊黄东男申浩辰吴南纪维玥

分类号：TG379

出版年,卷(期):页码：2019,44(8):92-99

摘要：

为研究预热温度对挤压管材6005A铝合金的组织及性能的影响，6005A铝合金分别在450,480和510 ℃的预热温度条件下挤压成空心方管，并采用金相显微镜、电子背散射衍射法，对挤压后方管的焊缝处及其周围的组织进行研究。试验结果表明：随着预热温度的增加，方管的平均晶粒尺寸和再结晶晶粒占比逐渐增大，方管焊缝处的R-goss织构和远离焊缝处的A织构的比例先增加后减小。同时，对方管焊缝及焊缝两侧进行硬度测试，结果表明，方管在预热温度为480 ℃挤压时，硬度值最大，方管焊缝处的硬度明显低于远离焊缝处的硬度。

The influence of preheating temperature on the microstructure and properties of 6005A aluminium alloy extruded tube was studied. Then, the 6005A aluminium alloy was extruded into hollow square tubes at 450, 480 and 510 ℃ preheating temperatures respectively, and the microstructures at the weld seam and surrounding of extruded square tube were studied by metallographic microscope and electron backscatter diffraction. The experimental results show that with the increasing of preheating temperature, the average grain size and recrystallized grain proportion of square tube increase gradually, and the ratio of R-goss texture at the weld seam of square tube and A texture far away from weld seam first increase and then decrease. Meanwhile, the hardness of the weld seam and both sides of the weld seam of square tube were tested. The results show that the hardness of square tube is the largest when it is extruded at 480 ℃, and the hardness at the weld seam of square tube is significantly lower than that far away from the weld seam.

基金项目：

国家自然科学基金资助项目（51364027）

作者简介：孙磊（1994-），男，硕士研究生 E-mail：1170948076@qq.com 通讯作者：黄东男（1979-），男，博士，教授 E-mail：dongnan_2000@163.com

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