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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替代方法控制3D短裂纹生长行为的主要微观结构特征

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摘要

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：通过采用X射线微断层扫描与EBSD串联切片相结合，可以精确地表征和连接复合3D微观结构和机械性能。全局敏感性和主要成分分析可用于排名和促进控制机械响应的贡献功能。之后，通过创建代理模型，可以通过支持向量机进一步分析最贡献特征和机械性能之间的关系。应用上述新方法研究了Ti-6Al-4V合金中的3D微观结构特征与短裂纹行为之间的关系。据透露，短裂缝路径，生长速率及其变异主要受与邻近谷物的相互作用的影响;然而，随着短裂缝前沿变大，这些相互作用的重要性降低和变化。在负载方向上的长裂解晶粒的大量晶粒可以对裂缝开口施加约束，导致低裂纹生长速率。对于较大的裂缝前沿，裂缝晶粒周围的剪切应力场的增加导致裂纹分叉并形成二次裂缝，导致裂纹驱动力的降低，具有低裂纹的生长速率。结论是，短裂纹行为受其相邻晶粒的形状，尺寸和晶体特征的强烈影响，这导致剪切和拉伸应力场的变化导致裂纹生长速率变化。

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