【摘要】：對(duì)比研究了未處理、脈沖磁場(chǎng)處理、機(jī)械振動(dòng)處理和脈沖磁場(chǎng)-機(jī)械振動(dòng)復(fù)合處理對(duì)K4169高溫合金凝固組織和力學(xué)性能的影響,并考察了復(fù)合處理?xiàng)l件下不同的脈沖電壓、脈沖頻率及澆注溫度時(shí)合金的初生相形貌。結(jié)果表明:經(jīng)脈沖磁場(chǎng)-機(jī)械振動(dòng)復(fù)合處理后,合金的晶粒尺寸由4.5 mm細(xì)化至0.98 mm,斷面等軸晶比例由36%提高至96%,且細(xì)化效果均好于單一的脈沖磁場(chǎng)處理或機(jī)械振動(dòng)處理,同時(shí)合金的抗拉強(qiáng)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(dá)的樹枝晶變成細(xì)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(fù)合處理后合金的初生相不斷細(xì)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(hào)：2313500