锻压技术

差温轧制建筑梁用7071铝合金板材微观组织及力学性能分析

英文标题：Analysis on microstructure and mechanical properties of 7071 aluminum alloy plate for construction beam in differential temperature rolling

作者：毕莹莹祁勇

单位：山东工业职业学院成都理工大学

关键词：差温轧制 7071铝合金微观组织力学性能再结晶

分类号：TG335.1

出版年,卷(期):页码：2019,44(4):171-175

摘要：

通过板材表面喷洒乳化液实现快速降温的方式对7071铝合金板进行差温轧制，采用SEM、室温拉伸和EBSD等方法，研究常规和差温轧制下7071铝合金板表面和中心的组织及性能变化。结果表明：两种轧制方式下再结晶晶粒都在轧制方向上变长，再结晶度从表面往内部逐渐变小，常规轧制层的再结晶度小于差温轧制。采用差温轧制方法得到的固溶态板材不同位置中的难溶相具有更好的均匀性，心部区域的难溶相尺寸比常规轧制的小。经过差温轧制后板材不同位置的力学性能差异变得更小，达到更均匀状态。板材经过差温轧制后，其表面伸长率明显增加，但中心部位却发生一定程度的降低。采用差温轧制方法能够提高板材的力学性能。

7071 aluminum alloy plate was rolled at differential temperature by spraying emulsion on the surface of plate to realize rapid cooling, and the changes of microstructure and properties of the surface and center of 7071 aluminum alloy plate in conventional rolling and differential temperature rolling were studied by SEM, room-temperature tensile and EBSD methods. The results show that the recrystallized grains grow longer in the rolling direction by both rolling methods, the recrystallization degree decreases gradually from the surface to the interior, and the recrystallization degree of conventional rolling layer is less than that of differential temperature rolling. Furthermore, the insoluble phases at different positions of solid soluble plate obtained by differential temperature rolling have better uniformity, and the size of insoluble phases in the core area is smaller than that of conventional rolling. After differential temperature rolling, the difference of mechanical properties at different positions of plate become smaller and reach a more uniform state. Meanwhile, after differential temperature rolling, the surface elongation of plate increases obviously, but the central part decreases to a certain extent. Thus, the mechanical properties of plate can be improved by differential temperature rolling.

基金项目：

山东省高等学校科研发展计划项目（J17KB054）

毕莹莹（1983-），女，硕士，讲师 E-mail：9146633@qq.com

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