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TG6鈦合金的高周疲勞性能
發(fā)布人：上海艾荔艾金屬材料有限公司www.85978597.cn
更新時(shí)間：2015-08-31
研究600 ℃不同應(yīng)力集中系數(shù)(Kt)條件下TG6鈦合金的高周疲勞性能，并用掃描電鏡對(duì)疲勞斷口形貌進(jìn)行觀察。
TG6鈦合金的高周疲勞性能High cycle fatigue of TG6 alloy
研究600
℃不同應(yīng)力集中系數(shù)(Kt)條件下TG6鈦合金的高周疲勞性能，并用掃描電鏡對(duì)疲勞斷口形貌進(jìn)行觀察。結(jié)果表明：應(yīng)力比(R)為0.1時(shí)，TG6合金光滑試樣的疲勞極限為365
MPa，缺口試樣的疲勞極限為220
MPa，表明該合金有敏感的缺口效應(yīng)；光滑試樣的疲勞裂紋源只有一個(gè)，出現(xiàn)在試樣內(nèi)部，缺口試樣在試樣表面有多個(gè)疲勞裂紋源；在疲勞裂紋擴(kuò)展區(qū)可見(jiàn)明顯疲勞條帶和二次裂紋，隨著裂紋擴(kuò)展長(zhǎng)度的增加，裂紋擴(kuò)展速率加快，疲勞條帶加寬；TG6合金疲勞斷裂呈韌性斷裂特征。
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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