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首页> 外文期刊>Journal of Materials Engineering and Performance >The Effect of Boron and Zirconium on the Structure and Tensile Properties of the Cast Nickel-Based Superalloy ATI 718Plus
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The Effect of Boron and Zirconium on the Structure and Tensile Properties of the Cast Nickel-Based Superalloy ATI 718Plus

机译：硼和锆对铸镍超合金ATI 718PLUS的结构和拉伸性能的影响

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摘要

The effects of boron and zirconium on cast structure, hardness, and tensile properties of the nickel-based superalloy 718Plus were investigated. For this purpose, five alloys with different contents of boron and zirconium were cast via vacuum induction melting and then purified via vacuum arc remelting. Microstructural analysis by light-optical microscope and scanning electron microscope equipped with energy-dispersive x-ray spectroscopy and phase studies by x-ray diffraction analysis were performed. The results showed that boron and zirconium tend to significantly reduce dendritic arm spacing and increase the amount of Laves, Laves/gamma eutectic, and carbide phases. It was also found that boron led to the formation of B~(4)C and (Cr, Fe, Mo, Ni, Ti)~(3)B~(2)phases and zirconium led to the formation of intermetallic phases and ZrC carbide. In the presence of boron and zirconium, the hardness and its difference between dendritic branches and inter-dendritic spaces increased by concentrating such phases as Laves in the inter-dendritic spaces. These elements had a negative effect on tensile properties of the alloy, including ductility and strength, mainly because of the increase in the Laves phase. It should be noted that the largest degradation of the tensile properties occurred in the alloys containing the maximum amount of zirconium.
机译：研究了硼和锆对镍基超合金718Plus浇铸结构，硬度和拉伸性能的影响。为此目的，通过真空诱导熔化铸造具有不同含量和锆的五种合金，然后通过真空弧形重熔纯化。通过光光学显微镜和扫描电子显微镜配备有能量分散X射线光谱和X射线衍射分析的相研究的微观结构分析。结果表明，硼和锆倾向于显着降低树突式臂间距，增加熔炉，疏浚/γ共晶和碳化物阶段的量。还发现硼导致B〜（4）C和（Cr，Fe，Mo，Ni，Ti）〜（3）B〜（2）阶段和锆的形成导致了金属间相和Zrc的形成碳化物。在硼和锆存在下，通过在树突间空间中浓缩这些相，通过浓缩这些相，在树突状分支和树突间空间之间的硬度和其差异增加。这些元素对合金的拉伸性质具有负面影响，包括延展性和强度，主要是由于疏浚阶段的增加。应当注意，拉伸性质的最大劣化在含有最大锆的合金中发生。

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