摘要
对比试验发现,随流孕育剂的合适成分(wB/%)为:70～75Si,1.5～2.5Ba,1～2Ca,≤1.5Al,粒度为0.3～0.7mm。随流孕育剂加入量过高容易产生夹杂物、夹渣缺陷,还会发生孕育剂聚集引起的硬质点。试验表明:气缸体加入0.08%～0.15%的随流孕育剂使石墨长度减少约0.05mm,硬度偏差从20HB减小到约8HB,抗拉强度提高14.4MPa,本体强度稳定达到250MPa。球铁曲轴加入0.06%～0.08%的随流孕育剂能改善球化,细化石墨,提高强度和伸长率,但缩松倾向可能会增大,还可能因球铁浇注温度较低,发生孕育剂聚集。
It was found by comparison tests that the proper composition (w B / %) of the stream inoculant is (w B / %):70～75 Si, 1.5～2.5 Ba, 1～2 Ca, ≤1.5 Al; the proper grain size is 0.3～0.7 mm. Too high addition amount of the stream inoculant is easy to cause inclusions, slag and inoculant cluster which would lead to the formation of hard spots. Test showed that, for the cylinder block, as a result by adding 0.08%～0.15% of stream inoculant, the graphite length was reduced by 0.05 mm, the hardness difference reduced from 20 HB to about 8 HB, tensile strength was increased by 14.4 MPa, and the tensile strength of block itself was kept steadily at 250 MPa, For the crankshaft, adding 0.06%～0.08% of stream inoculant could improve nodularity, fine the graphite, increase strength and elongation, however the shrinkage tendency would increase and maybe cause inoculant cluster due to the relatively lower pouring temperature of nodular iron.
出处
《现代铸铁》
CAS
2005年第3期1-5,共5页
Modern Cast Iron
关键词
随流孕育
灰铁
球铁
stream inoculation
gray iron
nodular iron
