23C6, 計算結(jié)果與實(shí)驗(yàn)結(jié)果吻合。γ′相析出量主要由Al、Ta和Nb含量控制, 隨Al、Ta和Nb含量增加, γ′相析出量顯著增加, 固溶溫度明顯升高, 液相初凝與終凝溫度逐漸降低。C含量決定MC和M23C6的析出量, MC和M23C6析出量隨C含量增加而增大。μ相析出主要受Re、W、Mo和Cr的影響, 隨Re、W、Mo和Cr含量增加, μ相開始析出溫度顯著升高, 析出溫度范圍明顯變寬, 最大析出量明顯增大。"/>

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低Re鎳基單晶高溫合金平衡相析出行為的熱力學(xué)模擬計算
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清華大學(xué)材料學(xué)院先進(jìn)成形制造教育部重點(diǎn)實(shí)驗(yàn)室,中國航發(fā)沈陽黎明航空發(fā)動機(jī) 集團(tuán) 有限責(zé)任公司,清華大學(xué)材料學(xué)院先進(jìn)成形制造教育部重點(diǎn)實(shí)驗(yàn)室,清華大學(xué)材料學(xué)院先進(jìn)成形制造教育部重點(diǎn)實(shí)驗(yàn)室

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TG111.5

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國家自然科學(xué)(51374137和51171089)；國家科技重大專項(xiàng)(2012ZX04012-011)；國家重點(diǎn)基礎(chǔ)研發(fā)項(xiàng)目(2011CB706801)


Thermodynamic Simulation Calculation on Precipitation Behavior of Equilibrium Phases in a Low Re-bearing Nickel-based Single Crystal Superalloy
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Key Laboratory for Advanced Materials Processing Technology,Ministry of Education,School of Materials Science and Engineering,Tsinghua University,Aero Engine Corporation of China AECC Shenyang Liming Aero-Engine Group Corporation Ltd,Key Laboratory for Advanced Materials Processing Technology,Ministry of Education,School of Materials Science and Engineering,Tsinghua University,Key Laboratory for Advanced Materials Processing Technology,Ministry of Education,School of Materials Science and Engineering,Tsinghua University

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    基于Pandat熱力學(xué)計算軟件及PanNi數(shù)據(jù)庫, 采用熱力學(xué)相平衡計算方法, 研究了合金成分對低錸DD6合金平衡相析出行為的影響。結(jié)果表明: DD6合金平衡相主要為γ相、γ′相、μ相及碳化物MC和M23C6, 計算結(jié)果與實(shí)驗(yàn)結(jié)果吻合。γ′相析出量主要由Al、Ta和Nb含量控制, 隨Al、Ta和Nb含量增加, γ′相析出量顯著增加, 固溶溫度明顯升高, 液相初凝與終凝溫度逐漸降低。C含量決定MC和M23C6的析出量, MC和M23C6析出量隨C含量增加而增大。μ相析出主要受Re、W、Mo和Cr的影響, 隨Re、W、Mo和Cr含量增加, μ相開始析出溫度顯著升高, 析出溫度范圍明顯變寬, 最大析出量明顯增大。

    Abstract:

    Based on thermodynamic calculation Pandat software and PanNi database, thermodynamic phase equilibrium calculation method was employed to investigate the effect of alloying composition on precipitation behavior of equilibrium phases in a low Re-containing nickel-based single crystal superalloy DD6. Results indicate that the equilibrium phases consist of γ, γ′, μ, MC and M23C6, and the calculated results are in excellent agreement with the experimental results. The Al, Ta and Nb content mainly control the mass fraction of γ′ precipitates. With increase of Al, Ta and Nb content, the mass fraction of γ′ precipitates is significantly enhanced, the solution temperature of γ′ precipitates is obviously increased, and the liquid starting and finishing solidification temperature is gradually decreased. The C content determines the precipitation amount of MC and M23C6. Increment of C content results in more precipitation of carbides. The precipitation of μ phase is predominantly influenced by Re, W, Mo and Cr. With the increase of Re, W, Mo and Cr content, the initial precipitation temperature of μ phase is significantly enhanced, the maximum precipitation amount of μ phase is obviously increased, and the precipitation temperature range of μ phase is markedly extended.

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蘇香林,孫長波,許慶彥,柳百成.低Re鎳基單晶高溫合金平衡相析出行為的熱力學(xué)模擬計算[J].稀有金屬材料與工程,2017,46(12):3699~3714.[Su Xianglin, Sun Changbo, Xu Qingyan, Liu Baicheng. Thermodynamic Simulation Calculation on Precipitation Behavior of Equilibrium Phases in a Low Re-bearing Nickel-based Single Crystal Superalloy[J]. Rare Metal Materials and Engineering,2017,46(12):3699~3714.]
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  • 收稿日期:2017-03-31
  • 最后修改日期:2017-09-28
  • 錄用日期:2017-10-10
  • 在線發(fā)布日期: 2018-01-04
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