2219铝合金环件孔洞缺陷分析

Analysis of hole defect of 2219 aluminum alloy ring

在对2219环锻件进行探伤时发现在内部存在缺陷,距内径约ø5 mm,距端面约80 mm,探伤显示缺陷呈长条状,长度约为30 mm,方向与锻件的直径方向平行。为了分析该缺陷产生的原因,实验室对有缺陷的试样进行了宏观组织、显微组织、扫描电镜及能谱分析,结果表明:2219铝合金环锻件出现的缺陷为孔洞缺陷,是由于原材料在冶炼时AlZr投入温度偏低,降低了元素扩散速率,增大AlZr合金相偏聚,产生了孔洞缺陷。

During the inspection of 2219 ring forgings,it was found that there were defects inside,which were about 5 mm from the inner diameter and 80 mm from the end face.The flaw detection showed that the defects were long strips with the length of about 30 mm,and the direction was parallel to the diameter direction of the forgings.In order to analyze the causes of the defects,the macrostructure,microstructure,scanning electron microscopy and energy spectrum analysis of the defective samples were studied in the laboratory.The results showed that the defects of 2219 aluminum alloy ring forging were hole defects,which were caused by the low AlZr input temperature during smelting.It reduced the diffusion rate of elements and increased the segregation of AlZr alloy phase,leading to the formation of hole defects.