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脈沖磁場-機械振動復(fù)合作用下K4169高溫合金凝固組織的細(xì)化
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國家自然科學(xué)基金 (51261026)；航空科學(xué)基金 (20125356009)


Microstructure Refinement of Superalloy K4169 with Compound Treatment of Pulsed Magnetic Field and Mechanical Vibration
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    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(fù)合處理對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(jié)果表明：經(jīng)脈沖磁場-機械振動復(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(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:

    Effects of no treatment, pulsed magnetic field (PMF) treatment, mechanical vibration treatment and compound treatment of pulsed magnetic field and mechanical vibration on the solidified structure and mechanical properties of superalloy K4169 were studied comparatively. Morphologies of primary phase of the alloy with different pulse voltages, pulse frequencies and pouring temperatures under the conditions of compound treatment were investigated. The results show that average grain size of the alloy is refined from 4.5 mm to 0.98 mm, and the fraction of equiaxed grains of the alloy is increased from 36% to 96% by compound treatment. Refinement effect of solidified structure by compound treatment is more efficient than that of pulsed magnetic field treatment or mechanical vibration treatment. Meanwhile, tensile strength and elongation of the alloy with compound treatment compared with the alloy in traditional condition increase by up to 49.2% and 37.3%, respectively. With the increase of the pulse voltage or frequency, primary phase of the alloy degrades gradually from well-developed dendrites into fine equiaxed grains or rosette crystals. When the pouring temperature is 1380~1530 °C, the increase of pouring temperature enhances the refinement effect of compound treatment

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謝小華,周 全,陳樂平,肖程波,湯 鑫.脈沖磁場-機械振動復(fù)合作用下K4169高溫合金凝固組織的細(xì)化[J].稀有金屬材料與工程,2015,44(12):3166~3172.[Xie Xiaohua, Zhou Quan, Chen Leping, Xiao Chengbo, Tang Xin. Microstructure Refinement of Superalloy K4169 with Compound Treatment of Pulsed Magnetic Field and Mechanical Vibration[J]. Rare Metal Materials and Engineering,2015,44(12):3166~3172.]
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  • 收稿日期:2014-12-20
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  • 在線發(fā)布日期: 2016-08-29
  • 出版日期: 2015-12-25