真空处理对薄壁球铁组织性能的影响  

Effects of vacuum treating on microstructure of thin-walled ductile cast iron

作　　者：李雷[1] 王强[1] 桃野正[2] 

机构地区：[1]河南理工大学材料科学与工程学院,河南焦作454000 [2]室兰工业大学材料物性工学科,日本室兰0508585

出　　处：《材料热处理学报》2011年第2期100-105,共6页Transactions of Materials and Heat Treatment

基　　金：河南省教育厅基金资助(2008A460009);河南理工大学博士基金;青年骨干教师基金资助(648524;649027);日本北海道科学技术综合振兴中心项目

摘　　要：制备了壁厚呈阶梯状的薄壁球墨铸铁件,研究了不同真空保压时间对薄壁球墨铸铁组织及石墨形貌的影响。结果表明,球墨铸铁合金熔体经过合适时间的真空保压,能够有效提高组织中的石墨数量,消除组织中分布的较大尺寸石墨。对于壁厚为2 mm的铸件,真空保压3 min后,组织性能最优。阶梯状铸件中不同壁厚部位中的珠光体率对熔体中的熔存含氧量的敏感度不同。熔体经真空保压3 min后,壁厚为4 mm和6 mm部位的珠光体率下降16%,而薄壁2 mm的部位珠光体率基本不变。The thin-walled ductile cast iron plate with step shape was fabricated.Effects of different holding time in vacuum on microstructure and graphite morphology of the thin walled ductile cast iron were studied.The results indicate that suitable holding time in vacuum can increase the amount of graphite nodule efficiently and remove the large graphite nodules in microstructrue.For the 2 mm-thick plate,when the melt is held in vacuum for 3 min,graphite nodules are fine and are distributed uniformly.The pearlite rates of the parts with different thickness for the cast plate exhibit different sensitivity to the dissolved oxygen in the melt.When the melts are held in vacuum for 3 min,the pearlite rates of the plate with thickness of 4 mm and 6 mm decrease by 16%,however,the pearlite rate of the plate with thickness of 2mm changes slightly.

关 键 词：薄壁球墨铸铁 真空保压 石墨数量 珠光体率 

分 类 号：TG143.5[一般工业技术—材料科学与工程]