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对比研究了未处理、脉冲磁场处理、机械振动处理和脉冲磁场-机械振动复合处理对K4169高温合金凝固组织和力学性能的影响,并考察了复合处理条件下不同的脉冲电压、脉冲频率及浇注温度时合金的初生相形貌。结果表明:经脉冲磁场-机械振动复合处理后,合金的晶粒尺寸由4.5 mm细化至0.98 mm,断面等轴晶比例由36%提高至96%,且细化效果均好于单一的脉冲磁场处理或机械振动处理,同时合金的抗拉强度和延伸率较常规铸造条件下分别提高了49.2%,37.3%。随着脉冲电压或脉冲频率增加,合金的初生相逐渐退化,由发达的树枝晶变成细小的等轴晶或蔷薇状晶体。在1380~1530℃范围内,随浇注温度的提高,复合处理后合金的初生相不断细化。
The effects of untreated, pulsed magnetic field, mechanical vibration and pulsed magnetic field - mechanical vibration on the solidification microstructure and mechanical properties of K4169 superalloy were investigated. The effects of different pulse voltage, pulse frequency and pouring temperature When the alloy morphology of the primary phase. The results show that the grain size of the alloy is refined from 4.5 mm to 0.98 mm and the proportion of equiaxed grains increases from 36% to 96% after pulsed magnetic field-mechanical vibration treatment, and the refining effect is better than single pulse Magnetic field treatment or mechanical vibration treatment, while the tensile strength and elongation of the alloy increased by 49.2%, 37.3% respectively compared with the conventional casting conditions. As the pulse voltage or pulse frequency increases, the primary phase of the alloy gradually degenerates from well-formed dendrites to fine equiaxed or rosaceous crystals. In the range of 1380 ~ 1530 ℃, with the increase of pouring temperature, the primary phase of the alloy was refined continuously.