Effect of post-treatment on the microstructure and high-temperature oxidation behaviour of additively manufactured inconel 718 alloy
Effect of post-treatment on the microstructure and high-temperature oxidation behaviour of additively manufactured inconel 718 alloy
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DOI：
10.1016/j.corsci.2019.06.030
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发表时间：
2019-09-01
影响因子：
8.3
通讯作者：
Lee, Kee-Ahn
中科院分区：
文献类型：
--
作者：
Kang, Yeon-Ji;Yang, Sangsun;Lee, Kee-Ahn
研究了固溶时效和热等静压处理对选择性激光熔化Inconel 718合金高温（900，1000 ℃）氧化的影响。氧化结果表明，HIP处理后的抗氧化性得到改善，这归因于HIP样品的更高密度和晶界处的微观结构差异。SA合金中阳离子沿着晶界扩散，而富Ti碳化物阻碍了HIP合金的晶界扩散。在SA合金中，γ“相和δ相分别在晶粒内和熔池边界处观察到。在热等静压处理的合金中，观察到不连续的MC，沿着与细小的γ '相。
The effect of solution ageing and hot isostatic pressing treatments on the high-temperature (900, 1000 degrees C) oxidation of selective laser melted Inconel 718 alloy was studied. Oxidation results showed improved oxidation resistance after HIP treatment, attributed to higher density of the HIP sample and microstructural differences at the grain boundaries. Cations diffused along the grain boundary in SA alloy, while Ti-rich carbides retarded grain boundary diffusion in HIPed alloy. In SA alloy, the gamma '' and delta phases were observed within the grain, and at the molten pool boundary, respectively. In HIPed alloy, discontinuous MC were observed, along with fine gamma' phases.