氩气和氮气雾化镍基高温合金粉末的对比研究

IF 0.9 4区 材料科学 Q3 MATERIALS SCIENCE, CERAMICS
Weijie Zhong, Hanlin Peng, Dongling Jiao, Wanqi Qiu, Zhongwu Liu, Wenyong Xu, Zhou Li, Guoqing Zhang
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引用次数: 0

摘要

这项工作可以研究和比较氩气和氮气雾化制备的镍基高温合金粉末的冷却速度、表面形貌和微观结构。结果表明:氩气和氮气雾化粉末的主相为FCC结构γ相和γ′强化相;x射线衍射未检测到粉末表面有明显的氮化物或氧化物。随着粉末粒度的减小,γ相的面间距和晶格常数增大。氮气雾化粉末和氩气雾化粉末是球形的,而氩气雾化粉末的球形度更高,表面更光滑。氩雾化产生了少量的卫星粒子,而雾化后的氮粉则有更多的分裂粒子。异形粉的比例随粉体粒度的减小而减小。通过控制晶粒尺寸,可以有效地获得高球形度的高温合金粉末。由于氩气雾化粉末的热膨胀系数较高,在相同粒径的情况下,氩气雾化粉末的波谷要高于氮气雾化粉末。随着粉末粒径的减小,两种粉末的空心度均减小,其中氩雾化粉末的空心度下降更快。熔滴冷却速度对粉末的表面特性有重要影响。氩雾化粉末的枝晶形貌比氮雾化粉末的枝晶形貌更明显。随着粉末粒度的减小,径向枝晶逐渐消失,枝晶和胞状晶体主导粉末表面。根据表面二次枝晶臂间距计算粉末的冷却速率。结果表明,氩雾化粉末的冷却速率为2.09 × 104 K ?S-1到1.26 ?105万?S-1,而氮气雾化粉末在2.71 ?104万?S-1和1.86 ?105k·s-1。由于冷却速度快,氮雾化粉末的二次枝晶臂间距比相同粒径的氩雾化粉末小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Comparative Study of Nickel-Based Super-Alloy Powders Atomized by Argon and Nitrogen

Comparative Study of Nickel-Based Super-Alloy Powders Atomized by Argon and Nitrogen

This work allowed the study and comparison of the cooling rate, surface morphology, and microstructure of nickel-based super-alloy powders produced by the atomization of argon and nitrogen. The results show that the principal phase in argon and nitrogen atomized powders has an FCC structured γ-phase with γ′-strengthening phase. X-ray diffraction detected no apparent nitride or oxide on the powder surface. The interplanar spacing and lattice constant of γ-phase increase as the powder size decreases. Nitrogen- and argon-atomized powders are spherical, but argon- atomized powders have higher sphericity and smoother surfaces. Atomization by argon has produced a small number of satellite particles, whereas atomized nitrogen powders have more split particles. The proportion of special-shaped powder decreases with the decreasing powder particle size. The super-alloy powder with high sphericity can be effectively obtained by controlling the particle size. Because of the higher coefficient of thermal expansion, the trough of argon-atomized powders is higher than that of nitrogen-atomized powders with the same particle size. As the powder particle size decreases, the hollowness of the powders declines for both powders, with the argon- atomized powder falling more quickly. The cooling rate of melted alloy droplets has an essential effect on the surface characteristics of the powder. The dendrite morphology of argon-atomized powders is more evident than that of nitrogen-atomized powders. As the powder particle size decreases, the radial dendrites gradually disappear, with dendrites and cellular crystals dominating the powder surface. The cooling rate of the powder is calculated based on the surface secondary dendrite arm spacing. It is found that argon-atomized powders exhibit cooling rates from 2.09 × 104 K ? s–1 to 1.26 ? 105 K ? s–1, while nitrogen-atomized powders show higher cooling rates in the range between 2.71 ? 104 K ? s–1 and 1.86 ? 105 K · s–1. Because of the higher cooling rate, nitrogen- atomized powders have a lower secondary dendrite arm spacing than argon-atomized powders with similar particle sizes.

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来源期刊
Powder Metallurgy and Metal Ceramics
Powder Metallurgy and Metal Ceramics 工程技术-材料科学:硅酸盐
CiteScore
1.90
自引率
20.00%
发文量
43
审稿时长
6-12 weeks
期刊介绍: Powder Metallurgy and Metal Ceramics covers topics of the theory, manufacturing technology, and properties of powder; technology of forming processes; the technology of sintering, heat treatment, and thermo-chemical treatment; properties of sintered materials; and testing methods.
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