Thermodynamic analysis of carbide precipitation and effect of its configuration on creep properties of FGH95 powder nickel-based superalloy

D.L. Shu; S.G. Tian; N. Tian; J. Xie; Y. Su

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Thermodynamic analysis of carbide precipitation and effect of its configuration on creep properties of FGH95 powder nickel-based superalloy

机译：碳化物沉淀的热力学分析及其构型对FGH95粉末镍基高温合金蠕变性能的影响

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By means of heat treatment at various regimes, creep property measurement, microstructure observation and thermodynamic analysis, the precipitation behaviors of carbides and effect of its configuration on the creep properties of FGH95 alloy are investigated. Results show that after solution treated at 1155 ℃ and fully heat treatment, the microstructure of alloy consists of fine γ' phase, γ matrix, (Nb, Ti)C and M_(23)C_6 carbides. The excellent creep life of alloy at 1034 MPa/650 ℃ is attributed to some fine carbide particles precipitating along boundaries to restrain dislocations and boundaries slipping. Moreover, the boundaries appear in the original PPB regions of alloy after solution treated at 1165 ℃, and the carbide films are continuously distributed along boundaries to weaken the bonding strength between grains, which are thought to be the main reason of the alloy displaying a weakest creep resistance. By means of thermodynamic calculation, the precipitation temperatures of NbC and TiC carbides are determined to be 1080 ℃ and 807 ℃, respectively. Compared to (Nb,Ti)C carbide, the reason of no WC carbide precipitated in the alloy is attributed to its smaller driving force of nucleation.

机译：通过各种方式的热处理，蠕变性能测量，显微组织观察和热力学分析，研究了碳化物的析出行为及其形态对FGH95合金蠕变性能的影响。结果表明，在1155℃固溶处理并充分热处理后，合金的微观组织由细γ'相，γ基体，（Nb，Ti）C和M_（23）C_6碳化物组成。合金在1034 MPa / 650℃时具有出色的蠕变寿命，这归因于一些细小的碳化物颗粒沿边界析出，以抑制位错和边界滑移。此外，在1165℃固溶处理后，合金的原始PPB区域出现了边界，碳化物膜沿边界连续分布，削弱了晶粒间的结合强度，这被认为是合金表现出最弱的主要原因。抗蠕变性。通过热力学计算，确定NbC和TiC碳化物的析出温度分别为1080℃和807℃。与（Nb，Ti）C碳化物相比，合金中未析出WC碳化物的原因是其成核的驱动力较小。

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来源
《Materials Science and Engineering》 |2017年第17期|152-161|共10页
作者
D.L. Shu; S.G. Tian; N. Tian; J. Xie; Y. Su;
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作者单位

Shenyang University of Technology, Shenyang 110870, China;

Shenyang University of Technology, Shenyang 110870, China;

Guizhou University of Engineering Science, Bijie 551700, China;

Shenyang University of Technology, Shenyang 110870, China;

Shenyang University of Technology, Shenyang 110870, China;

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正文语种 eng
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关键词
FGH95 alloy; Solution temperature; Creep properties; MC carbide; Thermodynamic analysis;

机译：FGH95合金;溶液温度;蠕变特性;MC碳化物;热力学分析;

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Thermodynamic analysis of carbide precipitation and effect of its configuration on creep properties of FGH95 powder nickel-based superalloy

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