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首页> 外文期刊>ISIJ international >Plastic Deformation and Fracture Behavior of Galvannealed Coating
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Plastic Deformation and Fracture Behavior of Galvannealed Coating

机译：镀锌涂层的塑性变形和断裂行为

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摘要

Deformation and fracture in galvannealed coating which was subjected to tensile or compressive stress by three point bend test were investigated by scanning electron microscopy. In the coating subjected to compressive stress, cracks were generated in the δ_1 phase and propagated at an angle inclined to coating plane in the δ_1 phase. Then, fracture occurred within δ_1 phase, or, along the Γ-Fe interface. In the coating subjected to tensile stress, cracks were generated in the δ_1 phase and propagated perpendicularly to coating plane in the δ_1 phase. Then, cracks reached and propagated along the Γ-Fe interface. The coating did not show any plastic deformation under tensile stress but showed apparent plastic deformation under compressive stress. During deformation of the coating and the steel substrate, there was substantial interaction and inhomogeneity. Major deformation mode in the coating was cracking while that in the steel substrate was inhomogeneous plastic deformation in the regions adjoining to the cracks, irrespective of compressive or tensile stress.
机译：通过扫描电子显微镜研究了通过三点弯曲试验经受拉伸或压缩应力的镀锌涂层的变形和断裂。在受到压缩应力的涂层中，在δ_1相中产生裂纹，并以相对于δ_1相中的涂层平面倾斜的角度扩展。然后，在δ_1相内或沿Γ-Fe界面发生断裂。在受到拉伸应力的涂层中，在δ_1相中产生裂纹，并在δ_1相中垂直于涂层平面传播。然后，裂纹沿着Γ-Fe界面到达并传播。该涂层在拉伸应力下没有表现出任何塑性变形，但是在压缩应力下表现出明显的塑性变形。在涂层和钢基材变形期间，存在大量的相互作用和不均匀性。涂层的主要变形模式是开裂，而钢基底的变形模式是在裂纹附近的塑性变形，而不考虑压缩应力或拉伸应力。

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