摘要
采用主动填充式搅拌摩擦修复技术对含预制腐蚀坑的2A12铝合金板进行修复试验。通过对修复试样的微观组织、截面硬度进行观察与测试,并对修复试样与未修复试样以及母材进行疲劳寿命试验,研究其疲劳性能的变化。结果表明:根据修复区的组织特征,修复区可以分成母材、热影响区、热机影响区和修复核心区四部分。修复试样修复区的截面硬度分布呈'W'形,最小值出现在热机影响区附近;修复后试样的平均寿命有了很大提升,是未修复试样寿命的6.6倍左右,未修复试样和修复试样的疲劳寿命分别达到母材的6.28%和41.3%。疲劳断口显示未修复试样稳定扩展区的疲劳条带间距比修复试样的稳定扩展区间距大,说明未修复试样的裂纹扩展的比已修复的快,而且修复试样的稳定扩展区中出现大量脱落的第二相粒子。
The 2 A12 aluminum alloy plate with prefabricated corrosion pit was repaired by active filling friction stir repair technology.The microstructure and cross-section hardness of the repaired specimens were observed and tested,and the fatigue life tests of the repaired specimens,the unrepaired specimens and the base metal were tested to study the change of fatigue property.The results show that according to the microstructure of the repair zone,the repair zone can be divided into four parts:base metal,heat affected zone,heat mechanical affected zone and repair core zone.The hardness distribution of the cross section of repair zone of the repaired specimen presents'W'shape,and the minimum value appears near the heat mechanical affected zone.The average life of the sample after repair improves significantly,which is 6.6 times of that of the unrepaired sample,and the fatigue lives of unrepaired and repaired samples reach 6.28%and 41.3%of that of the base material,respectively.The fatigue fracture shows that the spacing of fatigue bands in the stable growth zone of the unrepaired specimens is larger than that of the repaired specimens,which indicates that the crack growth of the unrepaired specimens is faster than that of the repaired specimens,and a large number of second phase particles appear in the stable growth zone of the repaired specimens.
作者
丛家慧
王磊
王晓宇
安金岚
CONG Jiahui;WANG Lei;WANG Xiaoyu;An Jinlan(School of Mechanical and Electrical Engineering,Shenyang Aerospace University,Shenyang110036,China;KeyLaboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process,Shenyang110036,China)
出处
《热加工工艺》
北大核心
2019年第11期130-133,共4页
Hot Working Technology
基金
国家自然科学基金资助项目(51775355,51405309)
关键词
主动填充式搅拌摩擦修复
腐蚀坑
显微组织
显微硬度
疲劳性能
active filling friction stir repairing
corrosion pit
microstructure
microhardness
fatigue performance
