球铁EN-GJS-400-18U-LT低温冲击韧度研究及改进措施

Study and Improvement on Low Temperature Impact Toughness of Ductile Iron EN-GJS-400-18U-LT

风电用球墨铸铁件采用EN-GJS-400-18U-LT制造,出于成本和安全考虑,不再添加合金元素Ni,并对低温性能提出了更高的要求。实验结果表明,球化剂中氧化镁的出现会使球化剂中有效镁减少,进而导致球墨铸铁球化率较差及低温冲击时冲击功较低,通过对球化剂中有效镁的作用机理的探讨,提出了在实际生产中解决氧化镁出现的办法,有效地提高了球铁铸件的质量。

The ductile cast iron used in wind power generation equipment is made of EN-GJS-400-18U-LT. On account of cost and safety considerations, it is without alloying elements Ni, and a higher property at low temperature is necessary. Experimental results show that, the MgO in nodulizer makes effective Mg decreased, leading to poorer nodularity in ductile iron and lower impact energy in low-temperature impact. solution in actual production was put forward. The quality By analyzing the effective role of Mg in nodulizer, the efficient of ductile cast iron can be effectively improved.