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TG6钛合金的高周疲劳性能
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2015-08-31
研究600 ℃不同应力集中系数(Kt)条件下TG6钛合金的高周疲劳性能，并用扫描电镜对疲劳断口形貌进行观察。
TG6钛合金的高周疲劳性能High cycle fatigue of TG6 alloy
研究600
℃不同应力集中系数(Kt)条件下TG6钛合金的高周疲劳性能，并用扫描电镜对疲劳断口形貌进行观察。结果表明：应力比(R)为0.1时，TG6合金光滑试样的疲劳极限为365
MPa，缺口试样的疲劳极限为220
MPa，表明该合金有敏感的缺口效应；光滑试样的疲劳裂纹源只有一个，出现在试样内部，缺口试样在试样表面有多个疲劳裂纹源；在疲劳裂纹扩展区可见明显疲劳条带和二次裂纹，随着裂纹扩展长度的增加，裂纹扩展速率加快，疲劳条带加宽；TG6合金疲劳断裂呈韧性断裂特征。
The high cycle fatigue (HCF) of TG6 titanium alloy was
investigated under the condition of different stress concentration factor
(Kt) at 600 ℃. In addition, the fatigue fracture surfaces of the
alloy were examined by scanning electron microscopy. The results show that the
high cycle fatigue limit strength for the smooth specimens is 365 MPa, and that
for the notched specimens is 220 MPa, indicating that the alloy has notch
sensitivity. SEM fractography indicates that the smooth specimens have one
inner-specimen initiation of fatigue cracks. However, the notched specimens have
multiple initiations of fatigue cracks across the surface. In the domain of
fatigue crack growth, fatigue striations and secondary cracks are distinctly
visible. As the length of crack grows, the width of the fatigue striations
increases. The fatigue fracture mode of TG6 titanium alloy shows a feature of
ductile fracture.
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