Investigation on the Thermal Crack Evolution and Oxidation Effect of Compacted Graphite Iron Under Thermal Shock

被引:12
作者
Wang, Xiaosong [1 ]
Zhang, Weizheng [1 ]
Guo, Bingbin [1 ]
机构
[1] Beijing Inst Technol, Sch Mech Engn, Beijing 100081, Peoples R China
关键词
compacted graphite cast iron; crack; graphite; oxidation; thermal shock; GRAY CAST-IRON; FATIGUE RESISTANCE; NONSMOOTH SURFACE; BEHAVIOR;
D O I
10.1007/s11665-015-1641-8
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
For a better understanding of the thermal fatigue behavior in compacted graphite cast iron (CGI), the cyclic thermal shock test is carried out through alternating induction heating and water quenching. The optical and scanning electron microscopy observations are used to examine the cracks and oxidation behavior on the cross section and heating surface of the material specimen, respectively. The results show that the thermal cracks in CGI initiate at the graphite phases mostly, and the multi-sourced thermal cracks would result in stable cracks morphology finally through crack shielding effect. In the oxidation analysis, it is found that the oxidation of graphite is selective, and the graphite is the potential channels for oxygen diffusion from the outside into the matrix, resulting in local oxidation of matrix around graphite and continuous oxygen diffusion paths in the microstructure. Thermal cracks nucleate from the oxidation holes at graphite caused by decarburization, and they prefer to propagate and coalesce by penetrating the oxide bridges.
引用
收藏
页码:3419 / 3425
页数:7
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