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首页> 外文会议>European Conference on Fracture >INFLUENCE OF CRYSTALLOGRAPHIC MISORIENTATION ON THE INITIATION AND GROWTH OF SHORT FATIGUE CRACKS IN A BETA-TITANIUM ALLOY
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INFLUENCE OF CRYSTALLOGRAPHIC MISORIENTATION ON THE INITIATION AND GROWTH OF SHORT FATIGUE CRACKS IN A BETA-TITANIUM ALLOY

机译：结晶误导性对β-钛合金短疲劳裂纹引发和生长的影响

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The present study is focused on the experimental characterisation of short crack initiation and growth in the solution annealed metastable beta-titanium alloy TIMETALLCB (Ti-6.8Mo-4.5Fe-1.5Al), applying EBSD (electron back-scattering diffraction) technique and using a servohydraulic testing system, which is equipped with a laser interferometric strain displacement gauge (ISDG) system. It was shown that microstructurally short fatigue cracks initiate preferentially either at grain boundaries without recognisable plastic deformation or at slip bands. Investigations of the local crystallographic orientation of grains involved in the growth process by EBSD documented that high-misorientation-angle conditions are favourable for this cracking stage. The short crack growth behaviour was found to depend on the misorientation of neighbouring grains. The ratio of crack depth c to half surface crack length a was determined to be approximately c/a = 0.5 by microscopic examination of cross sections of the specimens indicating the strong effect of anisotropy on the short crack growth behaviour. The anisotropy of the elastic properties of the microstructure and its influence on the stress distribution were determined in order to develop a better understanding of crack initiation and growth mechanisms. Determination of Young's modulus of individual grains as well as Young's modulus and Poisson's ratio of polycyrstals enabled to determine the anisotropic elastic constants of the material studied. The resulting values were applied to a FE simulation calculating the stress distribution. The prediction of this calculation regarding the locations of maximum elastic compatibility stress agrees very reasonably with the experimentally observed crack initiation sites.
机译：本研究专注于溶液退火稳定性β-钛合金TimetallCB（Ti-6.8MO-4.5FE-1.5AL）的短裂纹引发和生长的实验表征，施加EBSD（电子背散射衍射）技术和使用伺服液位测试系统，配备有激光干涉菌株位移计（ISDG）系统。结果表明，微观结构短的疲劳裂缝优先于晶界，没有可识别的塑性变形或滑动带。 EBSD参与生长过程中涉及的谷物的局部晶体取向的研究记录了这种裂化阶段的高杂志角条件。发现短裂纹增长行为取决于邻近谷物的杂乱。通过显微镜检查试样的横截面的微观检查确定裂缝深度C至半表面裂缝长度A的比例约为C / A = 0.5，表明各向异性对短裂纹生长行为的强效应强。确定了微观结构的弹性性质的各向异性及其对应力分布的影响，以便更好地理解裂纹启动和生长机制。杨氏模量的杨氏模量，以及杨氏模量和泊松的多折比率使能研究的材料的各向异性弹性常数。将得到的值应用于计算应力分布的FE模拟。对于最大弹性相容性应力的位置的预测，与实验观察到的裂纹引发位点非常合理地同意。

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