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首页> 外文期刊>ISIJ international >3D Observation of Micro-cracks as Cleavage Fracture Initiation Site in Ferrite-pearlite Steel
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3D Observation of Micro-cracks as Cleavage Fracture Initiation Site in Ferrite-pearlite Steel

机译：铁素体-珠光体钢中作为裂纹断裂起点的微裂纹的3D观察

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In order to establish a basis to predict fracture toughness of ferrite-pearlite steel, a two-stage investigation was performed. A 3D observation was first performed to characterize the relationship between micro-cracks and microstructures using a serial sectioning technique. Two types of micrographs before and after nital etching were taken to obtain 3D images of micro-cracks and microstructures, respectively. As a result of superposition of both the 3D images, it is found that a micro-crack initiated at ferrite-pearlite boundary and then propagated into pearlite grain. It is also found under the ellipse approximation of the micro-cracks that the distribution of major axis of micro-crack was close to that of the ferrite grain diameter and the distribution of miner axis was an intermediate between those of ferrite grain diameter and pearlite band thickness. Based on the results, we then proposed a 3D model on micro-crack with an oblate spheroid assumption of pearlite grain to quantitatively relate microstructures of ferrite-pearlite steel to the fracture stress. It was shown that the fracture stresses corrected by the proposed 3D model were 20–30% less than those evaluated by the conventional 2D model. It is expected to be caused by the reason that the accuracy of the conventional 2D model was less than that of the proposed 3D model based on the detailed 3D observation because the conventional model is based on the simplified assumption of 2D micro-crack in the 3D microstructure. Therefore, we can give a valuable basis to develop an accurate fracture toughness prediction model based on the detailed 3D observation.
机译：为了建立预测铁素体-珠光体钢的断裂韧性的基础，进行了两个阶段的研究。首先使用串行切片技术进行3D观察以表征微裂纹和微结构之间的关系。硝酸盐蚀刻之前和之后的两种显微照片分别获得了微裂纹和微结构的3D图像。作为两个3D图像叠加的结果，发现微裂纹在铁素体-珠光体边界开始，然后传播到珠光体晶粒中。还发现，在微裂纹的椭圆近似下，微裂纹的长轴分布接近于铁素体晶粒直径，而矿工轴的分布介于铁素体晶粒直径和珠光体带之间。厚度。根据结果​​，我们提出了一个微裂纹的3D模型，假设珠光体晶粒呈扁球形，将铁素体-珠光体钢的显微组织定量地与断裂应力相关联。结果表明，由建议的3D模型校正的断裂应力比常规2D模型评估的断裂应力小20–30％。可以认为是由于常规模型基于3D中2D微裂纹的简化假设，常规2D模型的精度低于基于详细3D观察提出的3D模型的精度。微观结构。因此，我们可以为基于详细的3D观测结果开发准确的断裂韧性预测模型提供有价值的基础。

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