【摘要】 进行了 4、 8BFe30 1 1白铜杆的热型连铸试验 ,在铸型温度 12 30℃、冷却位置 8mm、拉铸速度30mm/min、压头 30mm时 ,可获得表面光洁的 4白铜杆 ;枝晶间距 30～ 4 0 μm ,横向偏析比为 0 .71 压头为 18mm时 ,获得了表面光洁的 8白铜杆 ;枝晶距 4 5～ 5 5 μm ,横向偏析比为 0 .6 3 其σb 为 338～35 3MPa ,δ10 大于 70 % 分析表明 ,缩小两相区宽度并使之位于铸型出口处是消除热裂纹的关键更多还原

【Abstract】 Heated mold continuous casting of 4 and 8Fe30 21 1cupronickel rod is performed.The 4 cupronickel rod of shining surface is obtained with mould temperature of 1230℃,cooling distance of 8mm,casting speed of 30mm/min and metal head of 30mm.The dendrite space of the 4 rod is 30～40μm,and the segregation coefficient on transverse cross section is 0.71.The 8 cupronickel rod of shining surface is obtained with otherwise the same conditions except that the metal head is 18mm.The dendrite space of the 8 rod is 45～55μm,and the segregation coefficient on transverse cross secetion is 0.63.The typical tensile strength and elongation of the rods are 338～353MPa and 70%respectively.The results show that the key to the removing of the hot tear is to shorten the solid+liquid zone and move this zone to the adjacent of mold exit.更多还原