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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Effect of minor niobium addition on microstructure of a nickel-base directionally solidified superalloy
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Effect of minor niobium addition on microstructure of a nickel-base directionally solidified superalloy

机译:微量铌对镍基定向凝固高温合金组织的影响

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Scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron probe microanalysis (EPMA) and differential scanning calorimetry (DSC) were used to study the effect of minor niobium addition on as-cast microstructure of a nickel-base directionally solidified superalloy. A proper niobium addition resulted in the formation of homogeneous γ' particles almost with the same size throughout the whole dendrite. The ternary eutectic reaction L → (M_(23)C_6 + γ + γ) occurred with increasing niobium content, but no eutectic was found when niobium content was high enough because the NbC preferably precipitated and the eutectic reaction was suppressed.
机译:用扫描电子显微镜(SEM),透射电子显微镜(TEM),电子探针显微分析(EPMA)和差示扫描量热法(DSC)研究了少量铌对镍基定向凝固超合金铸态组织的影响。 。适当添加铌会导致形成均匀的γ'颗粒,在整个枝晶中其大小几乎相同。三价共晶反应L→(M_(23)C_6 +γ+γ)随着铌含量的增加而发生,但是当铌含量足够高时,由于NbC最好析出并抑制了共晶反应,所以没有发现共晶。

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