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首页> 外文期刊>Materials Science and Engineering >The effects of colony microstructure on the fatigue crack growth behavior for Ti-6A1-2Zr-2Sn-3Mo-1Cr-2Nb titanium alloy
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The effects of colony microstructure on the fatigue crack growth behavior for Ti-6A1-2Zr-2Sn-3Mo-1Cr-2Nb titanium alloy

机译：菌落组织对Ti-6A1-2Zr-2Sn-3Mo-1Cr-2Nb钛合金疲劳裂纹扩展行为的影响

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摘要

The fatigue crack growth (FCG) behavior for materials applied in aerospace field is very important, for the majority of incidents happened were due to fatigue fracture. Six double annealing processes were conducted to get different colony features for Ti-6A1-2Zr-2Sn-3Mo-1Cr-2Nb alloy. Then the effects of the colony microstructure on the FCG behavior of this alloy are studied. The results show that the FCG curves for Ti-6A1-2Zr-2Sn-3Mo-1Cr-2Nb alloy under four processes are distinguished by a clearly defined transition point. The values of △K_T (transitional stress intensity range) under these processes are almost the same, about 15 MPam~(1/2). The fatigue crack growth rates (FCGR) for six microstructures vary obviously at low △K-levels (△K ≤ △K_T) and then tend to approach each other at high △K-levels (△K ≥ △K_T). Above phenomena are all due to the difference of crack deflection effect caused by different colony microstructures. The α platelet thickness and colony size are two key parameters determining the crack deflection effect of colony microstructure. For microstructure with thin α platelets, the main crack cuts the α platelets easily and propagates in a flat way. In this situation, the colony size exerts no influence on crack propagation path. For microstructure with thick a platelets, the main crack tends to propagate along the colony boundaries or the α platelet spacings. In this situation, the colony size can greatly influence the crack propagation path. The bigger the colony size, the more the tortuous crack path.
机译：航空航天材料的疲劳裂纹扩展（FCG）行为非常重要，因为大多数事故是由于疲劳断裂引起的。对Ti-6A1-2Zr-2Sn-3Mo-1Cr-2Nb合金进行了六次双退火工艺以获得不同的菌落特征。然后研究了菌落微观结构对该合金FCG行为的影响。结果表明，Ti-6A1-2Zr-2Sn-3Mo-1Cr-2Nb合金在四个过程中的FCG曲线具有明确定义的转变点。在这些过程中，△K_T（过渡应力强度范围）的值几乎相同，约为15 MPam〜（1/2）。六个微观组织的疲劳裂纹扩展速率（FCGR）在低△K等级（△K≤△K_T）时变化明显，然后在高△K等级（△K≥△K_T）时趋于彼此接近。以上现象均归因于不同菌落微结构导致的裂纹偏转效果的差异。 α血小板厚度和菌落大小是决定菌落微结构裂纹变形效果的两个关键参数。对于具有薄α片的微结构，主裂纹容易切割α片并以平坦方式传播。在这种情况下，菌落尺寸对裂纹扩展路径没有影响。对于具有厚血小板的微结构，主裂纹倾向于沿着菌落边界或α血小板间距传播。在这种情况下，菌落的大小会极大地影响裂纹的传播路径。菌落尺寸越大，裂纹路径越曲折。

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  • 来源
    《Materials Science and Engineering》 |2015年第5期|252-258|共7页
  • 作者

    Xiao-Hui Shi; Wei-Dong Zeng; Chun-Ling Shi; Hao-Jun Wang; Zhi-Qiang Jia;

  • 作者单位

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China;

    AVIC Xi'an Aircraft Industry (Group) Company Limited, Xi'an, Shaanxi 710089, China;

    AVIC Xi'an Aircraft Industry (Group) Company Limited, Xi'an, Shaanxi 710089, China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China;

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  • 正文语种 eng
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  • 关键词

    Titanium; Platelet width; Fatigue crack growth; Colony size; Transition;

    机译：钛;血小板宽度;疲劳裂纹扩展;菌落大小;过渡;

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