【摘要】 对制作汽车后视镜支架的三种管坯进行了物理化学检测 ,以期查找其弯裂的原因 .研究表明 ,支架的开裂不是加工工艺造成的 ,也排除了管坯中杂质元素含量的影响 ,开裂的原因是管坯微观组织不均匀 ,Si局部偏折和夹杂物富集 ,材料的延性和韧性降低造所成的 .更多还原

【Abstract】 Mechanical and chemical examinations were conducted on three types of tube blank for making backview mirror stands in automobile so as to find out the cause of bending crack of the stands. The results showed that the crack of the stands was not caused by either working process or the influence of the content of impurity elements, but the nonuniform microstructure of the tube blank, the local segregation of Si and the enrichment of impurities which decreased the ductility and toughness of the material.更多还原