汽车底板纵梁用带Al-Si涂层硼钢板的热冲压  

Hot stamping of Al-Si coated boron steel plate used for car floor beam

作　　者：李兵[1,2] 张春[1,3] 王敏[1] 肖海峰[1] 张宇[2] 

机构地区：[1]湖北汽车工业学院材料科学与工程学院,湖北十堰442002 [2]东风汽车公司工艺研究所,湖北十堰442002 [3]西安交通大学机械学院,陕西西安710049

出　　处：《金属热处理》2017年第6期38-42,共5页Heat Treatment of Metals

基　　金：国家自然科学基金(51205116);湖北省教育厅科学计划项目(Q20151803)

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。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.

关 键 词：热冲压 硼钢板 AL-SI涂层 裂纹 

分 类 号：TG162.79[金属学及工艺—热处理]