脉冲磁场-机械振动复合作用下K4169高温合金凝固组织的细化

发布时间：2018-11-06 07:02

【摘要】：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。
[Abstract]:The effects of untreated, pulsed magnetic field treatment, mechanical vibration treatment and pulsed magnetic-mechanical vibration composite treatment on solidification structure and mechanical properties of K4169 superalloy were studied. The morphology of the primary phase of the alloy at pulse frequency and pouring temperature. The results show that the grain size of the alloy is refined from 4.5 mm to 0.98 mm, section and the equiaxed crystal ratio is increased from 36% to 96% after pulse magnetic field mechanical vibration treatment. The effect of refining is better than that of single pulsed magnetic field or mechanical vibration treatment, and the tensile strength and elongation of the alloy are increased by 49.2% and 37.3%, respectively, compared with the conventional casting conditions. With the increase of pulse voltage or pulse frequency, the primary phase of the alloy gradually degenerates, from developed dendrite to fine equiaxed crystal or rose crystal. In the range of 1380 鈩，

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