摘要
对6 mm厚度的H62黄铜搅拌摩擦焊(FSW)焊缝的微观组织、力学性能进行了研究,测试并比较了焊缝和母材金属的动电位和电阻率在热-力作用下的变化.结果表明,焊缝金属经热和机械力的作用后,焊核区、热力影响区和热影响区的平均晶粒尺寸较母材的35.6μm均有细化,依次为3.8,22.2,30.6μm,反应在力学性能上焊核区硬度最高,拉伸断裂发生在硬度较低的前进侧,在微观断口中存在大量尺寸不均的网状韧窝;焊缝的腐蚀电位较母材有所提高,腐蚀电流密度降低,电阻率高于母材.
The 6mm thick H62 brass plate was welded by friction stir welding and the microstructures and mechanical properties of the joints were investigated.Meanwhile,the potentiodynamic polarization and electrical resistivity of the joints were compared to the base metal,respectively.The results show that the welds have finer crystal grains under the thermal and mechanical force.The average grain sizes of weld nugget zone,thermo-mechanically affected zone and heat affected zone were 3.8 μm,22.2 μm and 30.6 μm,respectively.The maximum measure value of weld hardness is in the nugget zone and the fracture of specimens occurred at the advanced side because of lower hardness.Many dimples that had different size can be observed on the tensile fracture surface by SEM.The corrosion potential of the weld was more positive than the one of the base material,and the corrosion current density was less than the one of the parent material.In addition the electrical resistivity of weld exceeds the base material.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2014年第2期83-86,117,共4页
Transactions of The China Welding Institution
基金
吉林省科技厅高科技资助项目(20100362)
关键词
H62黄铜
搅拌摩擦焊
力学性能
耐蚀性能
电阻率
H62 brass
friction stir welding
mechanical property
corrosion-resistance property
electrical resistivity
