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采用真空熔炼、Ar气保护下拉式连续定向凝固方法制备了BFe10-1-1合金管材,确定了可获得表面光洁合金管材的工艺参数范围,并对不同制备工艺下合金管材的组织和力学性能进行了研究.结果表明,当冷却水流量、冷却距离和冷却水温度保持不变(分别为900 L/h,8 mm,25℃)时,在熔体温度1250—1280℃和下拉速度0.15—0.45 mm/s的范围内,合理匹配工艺参数,制备了直径10 mm、壁厚1.7 mm,内外表面光洁的柱状晶组织BFe10-1-1合金管材.微观偏析分析表明:主要合金元素中Ni和Fe是负偏析元素,主要富集于枝晶干,而Mn是正偏析元素,主要富集于枝晶间.与普通铸造相比,连续定向凝固方法制备的BFe10-1-1合金管材的偏析程度获得较大改善.合金管材室温拉伸呈典型的韧性断裂,延伸率达到49%,具有优良的塑性变形性能.试样的抗拉强度为212 MPa,显著低于普通铸造合金,有利于合金管材的后续加工成形.
BFe10-1-1 alloy tube was prepared by vacuum melting and Ar gas protection pull-down continuous directional solidification. The range of the process parameters of the surface smooth alloy tube was determined. The microstructure and mechanical properties of the alloy tube under different preparation processes The results show that when the cooling water flow rate, cooling distance and cooling water temperature remain unchanged (900 L / h, 8 mm, 25 ℃, respectively), the melt temperature is 1250-1280 ℃ and the pulldown speed is 0.15-0.45 mm / s, reasonable match the process parameters, prepared a diameter of 10 mm, wall thickness 1.7 mm, the inner and outer surface of the columnar crystal structure BFe10-1-1 alloy tube microstructure analysis showed that: the main alloying elements of Ni and Fe Is a negative segregation element, mainly enriched in dendritic dry, and Mn is a positive segregation element, mainly concentrated in the interdendritic. Compared with ordinary casting, continuous directional solidification BFe10-1-1 alloy tube obtained degree of segregation The tensile strength of the sample is 212 MPa, which is significantly lower than that of the ordinary cast alloy, which is good for the alloy pipe Follow-up processing into shape.