Study on exogenous inclusions in rotary bending fatigue fracture of Si- killed spring steel 55SiCr |
| |
| Authors: | MENG Yao- qing GUO Xiao- pei ZHAO Lei ZHAO Hao- qian ZHANG Lei |
| |
| Affiliation: | 1.Technology Center, Xingtai Iron and Steel Co., Ltd., Xingtai 054027, Hebei, China ; 2.Hebei Engineering Research Center for Wire Rod, Xingtai 054027, Hebei, China ;3. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China |
| |
| Abstract: | The size, distance from surface and composition of macro inclusions in rotary bending fatigue fracture of 1950MPa- class Si- killed 55SiCr suspension spring wire were analyzed by SEM- EDS. The composition distribution of endogenous oxide inclusions in the Si- killed 55SiCr wire rod were analyzed by means of FEI Explorer 4 automated scanning electron microscope, and the results show that macro inclusions in rotary bending fatigue fracture are exogenous inclusions. The distribution characteristics of these exogenous inclusions in the continuous casting bloom were studied by wire rod solidification dendritic display method. The results show that exogenous inclusions in fatigue fracture mainly are caused by the entrapment of mold powder, erosion of tundish line and submerged entry nozzle, and these exogenous inclusions mainly concentrate at the bloom loose side corner. |
| |
| Keywords: | spring steel exogenous inclusions rotary bending fatigue fracture bloom loose side corner |
|
| 点击此处可从《钢铁研究学报》浏览原始摘要信息 |
|
点击此处可从《钢铁研究学报》下载全文 |
|
