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TC4-DT钛合金疲劳裂纹扩展行为及Paris区转折点
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2015-08-29
研究TC4-DT钛合金在近门槛区的疲劳裂纹扩展速率和Paris区的转折点现象，并通过扫描电镜分析断口形貌和扩展路径，讨论等轴初生α相含量对TC4-DT钛合金疲劳裂纹扩展行为的影响规律。
TC4-DT钛合金疲劳裂纹扩展行为及Paris区转折点Fatigue crack propagation behavior and turning point in
Paris region of TC4-DT titanium alloys
研究TC4-DT钛合金在近门槛区的疲劳裂纹扩展速率和Paris区的转折点现象，并通过扫描电镜分析断口形貌和扩展路径，讨论等轴初生α相含量对TC4-DT钛合金疲劳裂纹扩展行为的影响规律。结果表明：随着等轴初生α相含量的减少，TC4-DT钛合金在近门槛区的疲劳裂纹扩展速率显著降低，并在da/dN—ΔK曲线的Paris区逐渐呈现转折点现象，转折点位置所对应的DKt值逐渐增大；片层组织在近门槛区的裂纹扩展路径曲折，疲劳裂纹扩展速率显著降低。
The fatigue crack growth rate and the turning point in
Paris region of the curves of the TC4-DT titanium alloy was compared. The effect
of the content of primary α phase on fatigue crack propagation behavior of
lamellar microstructure of TC4-DT titanium alloy was discussed by scanning
electron microscopy (SEM) analyses of fracture morphology and crack propagation
paths. The results show that there occurs lower fatigue crack growth rate with
decrease in the content of primary α phase, with appearance of the turning point
in Paris region and increase in the ΔKt of turning point. The
lamellar microstructure exhibits tortuous crack paths and fatigue crack
propagation resistance, which indicates that the lamellar structure has better
damage tolerance compared with bimodal structure.
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