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用装配3点弯曲试验装置的扫描电镜原位分析了GA钢板变形情况下镀层中裂纹的产生、扩展、镀层断裂及GA钢板在塑性变形过程中镀层与钢基体界面交互作用的情况。试验及分析结果表明:镀层承受拉应力的一侧,裂纹在Г/δ1相界面处产生,在δ1相中沿着垂直于镀层平面的方向扩展,并沿着Г相/钢基体界面延伸,镀层塑性变形的迹象不明显;镀层承受压应力的一侧表现出了明显的塑性变形,存在裂纹之间的相互作用和不均匀变形情况。合金化镀层无论承受拉应力还是压应力,镀层主要的破坏形式是断裂,而与镀层相接触的钢基体的主要破坏形式是局部不均匀塑性变形。
The formation, propagation and crack of the coating in the deformation of the GA steel plate and the interaction between the coating and the steel substrate interface in the plastic deformation process of the GA steel were analyzed by scanning electron microscopy (SEM) with 3-point bending test equipment. The experimental results show that the coating is exposed to tensile stress and the cracks are generated at the interface of Г / δ1 phase, extend in the δ1 phase along the plane perpendicular to the coating plane and extend along the interface of Г phase / steel substrate. The coating The plastic deformation is not obvious; the coating under compressive stress shows obvious plastic deformation, there is the interaction between the cracks and the uneven deformation. Regardless of whether tensile or compressive stress is applied to the alloyed coating, the main failure mode of the coating is fracture, whereas the main failure mode of the steel substrate in contact with the coating is local non-uniform plastic deformation.