中文摘要：

对带Al-Si涂层硼钢板进行汽车底板纵梁热冲压试验,利用光学显微镜,扫描电镜及能谱分析研究了热冲压前后该钢的组织和形貌。结果表明：热冲压后涂层由致密的化合物结构变成6层化合物结构,涂层中产生大量裂纹,变形处涂层脱落较多;涂层脱落越严重处,Si元素越少;涂层板在无润滑剂条件下热冲压时,零件表面划痕较多,涂层与模具产生粘着摩擦,导致零件断裂;玻璃润滑剂有利于改善摩擦条件,避免零件的成形开裂。

英文摘要：

Hot stamping test for car floor beam was carried out on Al-Si coated boron steel plate,and microstructure and morphologies of the steel before and after hot stamping were studied by means of optical microscope,scanning electron microscope and energy spectrum analysis.The results show that after hot stamping,the coating change from dense compound structure to 6 layer compound structure,and a large number of cracks occur in the coating,and the coating falls off seriously at deformation. The more serious the coating falls off,the less the silicon element. Under the condition of no lubrication,the parts have a lot of scratches on the surface,the coating and the mold produce adhesive friction,which leads to the fracture of the parts. Glass lubricant is beneficial to improve the friction condition and avoid the cracking of parts.