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

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