摘要
在国内外近年来可锻铸铁孕育剂研究的基础上,研制出一种能在800℃以下使共晶渗碳体迅速分解的可锻铸铁用高效孕育剂,其成分为0.4%~0.5%FeSiBa5RE3+0.1%NaCl十0.01%~0.013%Bi.用该复合孕育剂处理的可锻铸铁,在800℃以下保温20~30h,即可完全石墨化,机械性能可达到或超过KTH350-10.从而可取消传统的可锻铸铁退火必须经过900℃以上高温保温的第一阶段石墨化.因此可大大降低退火能耗,减少退火箱的烧损,消除铸件的变形、过热和过烧.既降低生产成本,又提高铸件质量.此外,还讨论了此孕育剂对可锻铸铁的孕育机理.
Based on the studies of the inoculants used for malleable iron in the present age,a new kind of high efficient complex inoculant consisting of 0. 4 %-0. 5 %FeSiBa5RE3+0. 1.%NaCl+0.01% ̄0.013%Bi, which can promote the eutectic cementite decomposed rapidly below 800℃,has been developed. The as-cast which iron specimens inoculated by this noculant can be annealed completely under 800℃×20h, 720℃×5h or 780℃×24h, 720℃×5h. Their mechanical properties are over KTH350-10. The inoculation mechanism of this complex inoculant is also discussed in this paper.
关键词
可锻铸铁
孕育剂
退火
石墨化
Malleable iron
Inoculants
Annealing
Graphitization