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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高温合金718Plus铸造组织、硬度和拉伸性能的影响。为此，通过真空感应熔炼铸造了五种不同硼和锆含量的合金，然后通过真空电弧重熔提纯。利用光学显微镜和扫描电子显微镜（配备有能量色散x射线光谱仪）进行微观结构分析，并通过x射线衍射分析进行相研究。结果表明，硼和锆倾向于显著减小枝晶臂间距，增加Laves、Laves/γ共晶和碳化物相的数量。硼导致了b4c和（Cr，Fe，Mo，Ni，Ti）~（3）b2相的形成，锆导致了金属间化合物相和ZrC碳化物的形成。在硼和锆的存在下，枝晶分支和枝晶间距之间的硬度及其差异通过将Laves等相集中在枝晶间距中而增加。这些元素对合金的拉伸性能，包括延展性和强度有负面影响，主要是因为Laves相的增加。应注意的是，拉伸性能的最大退化发生在锆含量最高的合金中。

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