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首页> 外文期刊>Materials Science and Engineering >Assessment of predominant microstructural features controlling 3D short crack growth behavior via a surrogate approach in Ti-6A1-4V
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Assessment of predominant microstructural features controlling 3D short crack growth behavior via a surrogate approach in Ti-6A1-4V

机译：通过Ti-6A1-4V中的替代方法评估控制3D短裂纹扩展行为的主要微观结构特征

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Complex 3D microstructure and mechanical properties can be precisely characterized and linked by employing the X-ray micro-tomography combined with EBSD serial sectioning. Global sensitivity and principal component analysis can be used to rank and coarsen the contributing features that control the mechanical response. Afterwards, by creating surrogate models, the relationship between the most contributing features and mechanical properties can be further analyzed via support vector machines. The aforementioned novel approach was applied to study the relationship between 3D microstructural features and short crack behavior in a Ti-6Al-4V alloy. It was revealed that short crack path, growth rate, and its variation are mainly affected by the interaction with neighboring grains; however, as the short crack front becomes larger, there is a decrease and a change in the importance of those interactions. A high number of grains in contact with long cracked a grains in the loading direction may impose a constraint on the crack opening resulting in low crack growth rates. For the larger crack front, the increase in the shear stress field around the cracked grains leads to crack bifurcations and to the formation of secondary cracks, resulting in a decrease in crack driving forces with low crack growth rates. It was concluded that short crack behavior is strongly affected by the shape, size, and crystallographic features of its neighboring grains, which cause variation in the shear and tensile stress fields resulting in crack growth rate variation.
机译：通过将X射线显微断层扫描与EBSD系列切片相结合，可以精确地表征和链接复杂的3D微结构和机械性能。全局灵敏度和主成分分析可用于对控制机械响应的贡献特征进行排序和粗化。之后，通过创建替代模型，可以通过支持向量机进一步分析最有贡献的特征与机械性能之间的关系。前述新颖方法被用于研究Ti-6Al-4V合金中3D微观结构特征与短裂纹行为之间的关系。结果表明，裂纹的短路径，生长速率及其变化主要受与相邻晶粒相互作用的影响。但是，随着短裂纹前沿变大，这些相互作用的重要性会降低并发生变化。在加载方向上与长裂纹的晶粒接触的大量晶粒可能会限制裂纹的开放，从而导致较低的裂纹扩展速率。对于较大的裂纹前沿，裂纹颗粒周围的剪切应力场的增加导致裂纹分叉并形成次级裂纹，从而导致裂纹驱动力降低且裂纹扩展速率较低。结论是，短裂纹行为受其相邻晶粒的形状，大小和晶体学特征强烈影响，这会导致剪切应力场和拉伸应力场发生变化，从而导致裂纹扩展速率发生变化。

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