【摘要】：對比研究了未處理、脈沖磁場處理、機械振動處理和脈沖磁場-機械振動復合處理對K4169高溫合金凝固組織和力學性能的影響,并考察了復合處理條件下不同的脈沖電壓、脈沖頻率及澆注溫度時合金的初生相形貌。結果表明:經(jīng)脈沖磁場-機械振動復合處理后,合金的晶粒尺寸由4.5 mm細化至0.98 mm,斷面等軸晶比例由36%提高至96%,且細化效果均好于單一的脈沖磁場處理或機械振動處理,同時合金的抗拉強度和延伸率較常規(guī)鑄造條件下分別提高了49.2%,37.3%。隨著脈沖電壓或脈沖頻率增加,合金的初生相逐漸退化,由發(fā)達的樹枝晶變成細小的等軸晶或薔薇狀晶體。在1380~1530℃范圍內(nèi),隨澆注溫度的提高,復合處理后合金的初生相不斷細化。
[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，

本文編號：2313500