Bond structure of 55SiCr steel used for coil springs of automotive suspension system
XING Xian-qiang1, CAO Wen-quan2, WANG Cun-yu2
1. Guangzhou Orsa Wire Science and Technology Co., Ltd., Guangzhou 510640, Guangdong, China; 2. Institute of Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China
Abstract:In order to study the effect of central segregation on the microstructure and properties of spring steel,the elemental segregation behavior,banded structure and mechanical properties of 55SiCr spring steel were studied by means of metallographic microscope,scanning electron microscope and electron probe. The results show that the content of Mn,Cr and Si in the banded structure is more than 1 times higher than that in the matrix. The segregation of alloying elements causes the banded structure. Cracks in the tensile specimens of spring steel originate from the segregated banded structure and eventually fracture through the growth of the banded structure. The banded segregation is an important factor affecting the mechanical properties of high strength spring steel.
邢献强, 曹文全, 王存宇. 汽车悬架系统用55SiCr弹簧钢丝带状组织[J]. 钢铁, 2020, 55(3): 68-73.
XING Xian-qiang, CAO Wen-quan, WANG Cun-yu. Bond structure of 55SiCr steel used for coil springs of automotive suspension system. Iron and Steel, 2020, 55(3): 68-73.
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