ZK60镁合金搅拌摩擦焊接头疲劳裂纹扩展分析
Fatigue Crack Propagation Performance Analysis of Friction Stir Welding Joint of ZK60 Magnesium Alloy
张红霞1
作者信息
- 1. 新乡职业技术学院数控技术学院,河南 新乡 453006
- 折叠
摘要
利用龙门式FSW设备完成ZK60板材的对焊,通过实验测试研究接头疲劳裂纹扩展性能.研究结果表明:试样表面形成了许多微小的裂纹结构.处于初期疲劳断裂阶段时,在疲劳断口区域形成了裂纹扩展小刻面.裂纹到达稳定扩展阶段后形成扇形扩断口形貌特征,并且在稳定扩展区中形成了河流状花样,生成了众多解理面与解理台阶.疲劳焊接接头出现晶粒位向变化而发生协调变形的情况.当焊核区发生疲劳断裂后,将引起再结晶晶粒数量的显著减小.该研究有助于分析焊接头的力学性能,为设计优异的焊接头期待理论支撑意义.
Abstract
The fatigue crack propagation performance of ZK60 plate was studied by means of experimental test by using gantry FSW equipment.The results show that many micro crack structures are formed on the surface of the sample.At the initial fatigue fracture stage,a small facet of crack growth is formed in the fatigue fracture region.After the crack reaches the stable expansion stage,the fan-shaped fracture morphology is formed,and the river pattern is formed in the stable expansion zone,and many cleavage planes and cleavage steps are generated.The fatigue welded joint has coordinated deformation due to grain orientation change.The number of recrystallized grains decreases significantly when fatigue fracture occurs in the weld core.This study is helpful to analyze the mechanical properties of welded joints and provide theoretical support for the design of excellent welded joints.
关键词
ZK60镁合金/搅拌摩擦焊/接头/疲劳裂纹Key words
ZK60 magnesium alloy/friction stir welding/joint/fatigue crack引用本文复制引用
出版年
2024
NETL
NSTL
万方数据