锻压技术

预拉变形量对2219铝合金固溶处理后晶粒度的影响

英文标题：Influence of pretension deformation amount on grain size of aluminum alloy 2219 after solution treatment

分类号：TG146.2

出版年,卷(期):页码：2018,43(6):162-165

摘要：

针对运载火箭贮箱2219铝合金瓜瓣拉形成形过程中的粗晶问题，为制定合理的2219铝合金瓜瓣多道次拉形成形工艺，将退火态平板拉伸试件预拉到不同变形量后进行固溶处理，然后测定其晶粒度，建立固溶处理前预拉变形量和晶粒度之间的关系曲线，研究固溶处理前预拉变形量对2219铝合金固溶处理后晶粒度的影响。结果表明，不同固溶处理前预拉变形量对固溶热处理后晶粒尺寸影响显著，且存在一个临界变形量，预拉变形量小于3%时，晶粒尺寸与原始晶粒尺寸相当；当预拉变形量处于3%~5%区间时，随着预变形量的增大，晶粒尺寸不断增大。

For the problem of coarse grain in the stretch forming process of aluminum alloy 2219 scalloped segment of carrier rocket tank, in order to develop a reasonable multipass forming process, the solution treatment was conducted after the tensile specimens with annealing state were prestretched under different deformation amounts, and the grain size was measured. Then, the relationship curve between the pretension deformation before solution treatment and the grain size was established, and the influence of pretension deformation before solution treatment on the grain size of aluminum alloy 2219 after solution treatment was studied. The results show that the influences of different prestretch deformation amount on the grain size after solution treatment are significant, and there is a critical deformation amount. When the pretension deformation amount is less than 3%, the grain size is equal to the original grain size. However, when the pretension deformation amount is within 3%-5%, with increasing of the deformation amount, the grain size increases.

基金项目：

天津市科技支撑项目（17YFZCGX00530）

张杰刚（1980-），男，硕士研究生；Email：664217923@qq.com；通讯作者：李继光（1981-），男，博士，高级工程师；Email：jiguangli2008@126.com

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