摘要
针对铝锂合金Al-Li-S-4进行对接搅拌摩擦焊,通过拉伸试验、微观组织观察、硬度测试等手段考察了铝锂合金对接接头的搅拌摩擦焊性能。结果发现,随着工艺参数热输入量R(转速/焊速)的增加,接头力学性能包括抗拉强度、伸长率等逐渐下降,当R>10时,下降趋势更加明显。R=1.5时其抗拉强度达到母材的83%。同时,热输入量的增大造成了微观组织的变化。材料的流动性增强,焊核区和热机影响区的界限变得模糊,晶粒更加粗大。硬度测试表明,接头区域的硬度低于母材,并且随着热输入量的增大,接头受到热循环影响的软化区域变宽,力学性能受到影响。
Butt friction stir welding was carded out on A1-Li-S-4 alloy base metal. The tensile testing, microstructure observation and hardness test, mechanical properties and impact factors were studied. The results show that as process parameters heat input R （rotational speed/welding speed） increases, the mechanical properties of the welded joint including tensile strength, elongation gradual decline. In the case R〉10, downward trend of the mechanical properties is more obvious, in the case R=1.5, the tensile strength of the sample is 83% of the parent metal. At the same time, the increase of heat input changes in the microstrueture. The liquidity of the material enhances, which lead that the boundaries of welding area and heat engine influencing zone become blurred, and the grains become more bulky. The hardness tests show that the joint area of hardness is lower than parent metal. With the increase of heat input, the softening area affected by thermal cycle gets wider, and the mechanical properties are affected.
出处
《热加工工艺》
CSCD
北大核心
2014年第11期48-51,共4页
Hot Working Technology
关键词
搅拌摩擦焊
铝锂合金
微观组织
力学性能
friction stir welding
aluminum lithium alloy
microstructure
mechanical property
