针对薄壁铸态铁素体球铁生产中的问题,对含 Bi 硅基孕育剂对铸态铁素体球铁的孕育效果及对石墨形态的影响作了实验室试验。结果表明,含适量 Bi 的硅基孕育剂能较显著地提高铸态铁素体球铁孕育效果,尤其适合于铸态铁素体薄壁小件。控制...针对薄壁铸态铁素体球铁生产中的问题,对含 Bi 硅基孕育剂对铸态铁素体球铁的孕育效果及对石墨形态的影响作了实验室试验。结果表明,含适量 Bi 的硅基孕育剂能较显著地提高铸态铁素体球铁孕育效果,尤其适合于铸态铁素体薄壁小件。控制好孕育剂中 Bi 含量,Bi 对石墨形态不会产生不良影响。展开更多
Spheroidal graphite malleable cast iron is a new structural material developed in the recent years. This paper studies the influence of the residual content of rare earth and magnesium on the nodule counts, the time o...Spheroidal graphite malleable cast iron is a new structural material developed in the recent years. This paper studies the influence of the residual content of rare earth and magnesium on the nodule counts, the time of first stage graphitization and the rate of ferritization of it. Moreover, the role of sulfides of rare earth and magnesium in the process of graphitization has been analyzed. The results show that the residual content of rare earth and magnesium has a notable influence on the graphitic nodule counts and the time of the first stage graphitization of spheroidal graphite, but has unremarkable influence on the time of the second stage graphitization. There are a large number of spherical sulfides of rare earth and magnesium in as-cast structure, which will act as the nucleus of graphite in the process of first stage graphitization.展开更多
文摘Spheroidal graphite malleable cast iron is a new structural material developed in the recent years. This paper studies the influence of the residual content of rare earth and magnesium on the nodule counts, the time of first stage graphitization and the rate of ferritization of it. Moreover, the role of sulfides of rare earth and magnesium in the process of graphitization has been analyzed. The results show that the residual content of rare earth and magnesium has a notable influence on the graphitic nodule counts and the time of the first stage graphitization of spheroidal graphite, but has unremarkable influence on the time of the second stage graphitization. There are a large number of spherical sulfides of rare earth and magnesium in as-cast structure, which will act as the nucleus of graphite in the process of first stage graphitization.
