摘要
为研究原铁液硅含量对厚大断面球墨铸铁件凝固组织石墨形态和力学性能的影响,使用高精度热模拟系统,考察了不同硅含量的原铁液经过相同球化孕育工艺处理后在相同凝固条件下获得的厚大断面球墨铸铁件试样的凝固组织石墨形态和力学性能。结果表明,球化孕育工艺相同时,随着原铁液硅含量提高,厚大断面球墨铸铁件石墨形态恶化,力学性能下降。当钇基重稀土球化剂和含Ba孕育剂加入量分别为1.8%和0.4%时,原铁液硅含量控制在1.2%以内,有利于防止厚大断面球墨铸铁件石墨畸变,提高铸件力学性能。
In order to identify effect of Si in base iron on graphite morphology and mechanical properties of heavy section ductile iron, it was investigated that the graphite morphology and mechanical properties of the heavy section ductile iron samples contained different Si amount in base iron. The melts of the samples were all treated and inoculated under same process, and solidified under the same condition in a high precision thermal simulation system. Results of experiments indicated that the degenerate graphite increased and the mechanical properties of heavy section ductile iron decreased as the amount of Si in base iron increased. The results also show that it is necessary to restrict Si of base iron within 1.2% in order to control graphite degeneration and improve mechanical properties, when the base iron melt is treated with 1.8% nodularizer contained Y and 0.4% inoculant contained Ba.
出处
《铸造》
EI
CAS
CSCD
北大核心
2007年第5期513-515,共3页
Foundry
关键词
厚大断面球墨铸铁件
石墨形态
力学性能
硅
原铁液
heavy section ductile iron
graphite morphology mechanical property
Si
base iron
