超声滚压对5083铝合金焊接接头表面性能的影响
Effect of ultrasonic rolling on the surface properties of welded joints of 5083 aluminum alloy
李睿 1刘鹏涛 1杨超然 1毛旭1
作者信息
- 1. 大连交通大学 材料科学与工程学院,辽宁 大连 116028
- 折叠
摘要
对5083铝合金MIG焊接头进行表面超声滚压处理,对比分析了超声滚压处理前后接头表层微观组织、表面形貌、表面粗糙度、硬度、残余应力等表面性能变化,并测试了接头的耐腐蚀性能.结果表明:表面超声滚压处理后,接头表层金属发生了明显塑性流变,表层晶粒发生一定程度细化;接头表面粗糙度值明显降低,其中热影响区降低最明显,Ra值由2.93 μm降至0.155 μm,表面变得光滑平整;接头表面硬度增加,焊缝区提高最明显,由97.92HV升至124.67HV.超声滚压处理后接头焊缝附近的残余拉应力全部转变为-300 MPa左右的残余压应力.耐腐蚀试验结果表明,超声滚压处理后接头的表面耐腐蚀性能得到一定程度的提高.
Abstract
The surface ultrasonic rolling treatment of 5083 aluminum alloy MIG welded joints was carried out.The surface microstructure,surface morphology,surface roughness,hardness and residual stress of the joints before and after ultrasonic rolling treatment were compared and analyzed,and the corrosion resistance of the joints was tested.The results showed that after surface ultrasonic rolling treatment,the surface metal of the joint had obvious plastic flow,and the surface grains were refined to a certain extent.The surface roughness of the joint was obviously reduced,and the heat-affected zone was the most obvious.The Ra value was reduced from 2.93 µm to 0.155 μm,and the surface becomed smooth and flat.The surface hardness of the joint increased,and the weld zone increased most obviously,from 97.92HV to 124.67HV.After ultrasonic rolling treatment,the residual tensile stress near the weld of the joint was completely transformed into the residual compressive stress of about-300 MPa.The corrosion resistance test results showed that the surface corrosion resistance of the joint after ultrasonic rolling treatment was improved to a certain extent.
关键词
5083铝合金/表面超声滚压处理/表面粗糙度/残余应力/耐腐蚀性能Key words
5083 aluminium alloy/surface ultrasonic rolling treatment/surface roughness/residual stress/corrosion resistance引用本文复制引用
基金项目
航空科学基金项目(实验室类)(20200036064001)
出版年
2024
NETL
NSTL
万方数据