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采用Gleeble-3500获得了带Al-Si镀层硼钢板的流动行为,并与无镀层板进行比较;在光学显微镜下观察变形条件对表面镀层完整性的影响;在SEM下观察了带Al-Si镀层硼钢板试样的断口形貌。结果表明,带Al-Si镀层硼钢板的抗拉强度和伸长率在试验条件下均低于无镀层板的。热拉伸变形后,硼钢表面Al-Si镀层产生了大量的裂纹,其宽度和密度对变形温度和应变速率较敏感。镀层的开裂导致基体裸露并氧化,降低了镀层的粘附力。断口形貌观察显示镀层与基体具有较明显的成形性差异。可以通过奥氏体化调控Al-Si镀层中富铁韧性相的相转变来增强其成形性。
The flow behavior of boron steel plate with Al-Si coating was obtained by Gleeble-3500 and compared with that of uncoated plate. The effect of deformation conditions on the surface coating integrity was observed under optical microscope. The microstructure of Al-Si coating with Al-Si coating Fracture morphology of boron steel samples. The results show that the tensile strength and elongation of Al-Si coated boron steel sheets are lower than those of the uncoated sheets under the experimental conditions. After hot tensile deformation, the Al-Si coating on the surface of boron steel produced a large number of cracks, its width and density are more sensitive to deformation temperature and strain rate. Cracking of the coating causes the substrate to be bare and oxidized, reducing the adhesion of the coating. Fracture morphology shows that the coating and the matrix have obvious formability differences. The formability can be enhanced by austenitizing the phase transformation of the iron-rich toughness phase in Al-Si coatings.