Effect of the overlapping factor on the microstructure and mechanical properties of pulsed Nd:YAG laser welded Ti6Al4V sheets
Effect of the overlapping factor on the microstructure and mechanical properties of pulsed Nd:YAG laser welded Ti6Al4V sheets
复制标题
重叠系数对脉冲Nd:YAG激光焊接Ti6Al4V板材显微组织和力学性能的影响
DOI：
10.1016/j.matchar.2014.04.005
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发表时间：
2014-07
影响因子：
4.7
通讯作者：
Zhang Jian-Xun
中科院分区：
文献类型：
--
作者：
Gao Xiao-Long;Liu Jing;Zhang Lin-Jie;Zhang Jian-Xun
通过显微组织观察、显微硬度测试、拉伸试验和疲劳试验，研究了脉冲Nd：YAG激光焊接Ti 6Al 4V钛合金薄板时，重叠因子对焊接接头显微组织和力学性能的影响。显微组织分析表明，随着搭接系数的增大，熔合区晶粒变粗，热影响区宽度增大。随着搭接系数的增大，热影响区中完全由马氏体α′和第二α相组成的区域宽度增大，从熔合区到母材方向的组织沿着梯度减小，显微硬度梯度减小。拉伸和疲劳试验结果表明，中等搭接系数的接头力学性能优于低搭接系数和高搭接系数的接头。根据试验结果，可以说，如果使用适当的重叠因子，可以获得良好的Ti6Al4V合金焊接。
The effect of the overlapping factor on the microstructures and mechanical properties of pulsed Nd:YAG laser welded Ti6Al4V alloy sheets was investigated by microstructural observations, microhardness tests, tensile tests and fatigue tests. A microstructural examination shows that by increasing the overlapping factor, the grains in the fusion zone become coarser, and the width of the heat affected zone increases. As overlapping factor increases, the width of region composed completely of martensite α′ and the secondary α phase in the heat affected zone increases, consequently the gradient of microstructure along the direction from the fusion zone to base metal decreases, so does the gradient of microhardness. The results of tensile and fatigue tests reveal that the joints made using medium overlapping factor exhibit better mechanical properties than those welded with low and high overlapping factors. Based on the experimental results, it can be stated that a sound weld of Ti6Al4V alloy can be obtained if an appropriate overlapping factor is used.
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作者：
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