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为研究真空感应熔炼炉的真空度对Ni-Fe-Cr基合金力学性能的影响,在不同真空度条件下制备 4 个样品。化学分析结果表明:在氩气保护气氛下,Al和Ti的损耗较多,而在真空条件下其损耗较少。气体分析结果表明:样品中氧和氮的含量随真空度的增加而降低。而在更高的真空度下,样品中的氧和氮则没有损耗。热力学计算表明:由于平衡的氧含量值较低,TiO2和Al2O3生成的可能性高。高真空度使合金的拉伸强度和屈服强度降低,但是由于少量的杂质以及Al和Ti的损耗,合金的伸长率和断面收缩率增加。此外,提高真空度使合金由脆性断裂转变为韧性断裂。
In order to study the vacuum degree of vacuum induction melting furnace on the mechanical properties of Ni-Fe-Cr based alloys, four samples were prepared under different vacuum conditions. The results of chemical analysis show that the loss of Al and Ti is more under the protective atmosphere of argon, while the loss under vacuum is lower. Gas analysis showed that the content of oxygen and nitrogen in the sample decreased with the increase of vacuum degree. At higher vacuums, there is no loss of oxygen and nitrogen in the sample. Thermodynamic calculations show that TiO2 and Al2O3 are highly likely to be formed due to lower equilibrium oxygen content values. The high degree of vacuum reduces the tensile strength and yield strength of the alloy, but due to the small amount of impurities and the loss of Al and Ti, the elongation and reduction of area of the alloy increase. In addition, increasing the vacuum allows the alloy to transform from brittle fracture to ductile fracture.