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采用不同重熔工艺制备K452合金试样,测试试样在900℃下的拉伸性能。结果表明:当浇注温度为1430℃时,试样的抗拉强度从410 MPa变化到510 MPa,延伸率从3.5%变化到22.0%,实验数据较分散;试样中O和N平均含量较高,尤其N含量达0.0028%之多;断口上存在大量疏松。当浇注温度提高到1500℃时,拉伸性能得到提高,试样中O和N的平均含量有所降低,断口上疏松减少。当合金经过1590℃保温5 min的高温净化处理,浇注温度仍为1500℃时,试样的拉伸性能大幅度提高,O和N的平均含量明显降低,断口上没有观察到疏松,实验数据具有较好的一致性。
K452 alloy samples were prepared by different remelting process and the tensile properties of the samples at 900 ℃ were tested. The results show that when the pouring temperature is 1430 ℃, the tensile strength of the sample changes from 410 MPa to 510 MPa, the elongation changes from 3.5% to 22.0%, the experimental data are more dispersed; the average content of O and N in the sample is higher , Especially N content of up to 0.0028% as much; there is a lot of loose fracture. When the pouring temperature is increased to 1500 ℃, the tensile properties are improved, the average content of O and N in the sample is reduced, and the looseness of the fracture is reduced. When the alloy was treated with high temperature of 1590 ℃ for 5 min and the pouring temperature was still 1500 ℃, the tensile properties of the samples were greatly improved, the average contents of O and N were obviously decreased, and no looseness was observed on the fracture surface. The experimental data had Better consistency.