Rotating–bending fatigue of a laser-welded superelastic NiTi alloy wire
Rotating–bending fatigue of a laser-welded superelastic NiTi alloy wire
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DOI：
10.1016/j.matchar.2005.12.009
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发表时间：
2006-07
影响因子：
4.7
通讯作者：
X. Yan;Dazhi Yang;M. Qi
中科院分区：
文献类型：
--
作者：
X. Yan;Dazhi Yang;M. Qi
研究了激光焊接超弹性NiTi合金丝材的弯曲疲劳性能。与母材相比，当应变幅保持在0.4%以上时，焊接试样的失效循环次数显著减少。这主要是由焊接接头中的粗晶和枝晶组织引起的。当应变幅小于0.4%时，焊接和未焊接的试件都可以承受106次循环而不发生破坏。
The rotating–bending fatigue of a laser-welded superelastic NiTi alloy wire was investigated. In comparison with the base metal, the welded specimens show significantly reduced numbers of cycles to failure when strain amplitude remains above 0.4%. This is mainly caused by coarse-grained and dendritic microstructure in the welded joints. Both the welded and unwelded specimens can be loaded up to 106cycles without failure if the strain amplitude remains below 0.4%.