Oxidation during the production of FGH4095 superalloy powders by electrode induction-melt inert gas atomization

doi:10.1088/1674-1056/27/4/044701

中国物理B ›› 2018, Vol. 27 ›› Issue (4): 44701-044701.doi: 10.1088/1674-1056/27/4/044701

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Oxidation during the production of FGH4095 superalloy powders by electrode induction-melt inert gas atomization

Shan Feng(峰山), Min Xia(夏敏), Chang-Chun Ge(葛昌纯)

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

收稿日期:2017-09-07 修回日期:2017-12-12 出版日期:2018-04-05 发布日期:2018-04-05
通讯作者: Min Xia, Chang-Chun Ge E-mail:xmdsg@ustb.edu.cn;ccge@mater.ustb.edu.cn

Oxidation during the production of FGH4095 superalloy powders by electrode induction-melt inert gas atomization

Shan Feng(峰山), Min Xia(夏敏), Chang-Chun Ge(葛昌纯)

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received:2017-09-07 Revised:2017-12-12 Online:2018-04-05 Published:2018-04-05
Contact: Min Xia, Chang-Chun Ge E-mail:xmdsg@ustb.edu.cn;ccge@mater.ustb.edu.cn

摘要/Abstract

摘要：

Super-clean and super-spherical FGH4095 superalloy powder is produced by the ceramic-free electrode induction-melt inert gas atomization (EIGA) technique. A continuous and steady-state liquid metal flow is achieved at high-frequency (350 kHz) alternating current and high electric power (100 kW). The superalloy is immersed in a high-frequency induction coil, and the liquid metal falling into a supersonic nozzle is atomized by an Ar gas of high kinetic gas energy. Numerical calculations are performed to optimize the structure parameters for the nozzle tip. The undesired oxidation reaction of alloying elements starts at 1000℃ with the reaction originating from the active sites on the powder surfaces, leading to the formation of oxides, Me_xO_y. The role of active sites and kinetic factors associated with the diffusion of oxygen present in the atomization gas streams are also examined. The observed results reveal that the oxidation process occurring at the surface of the produced powders gradually moves toward the core, and that there exists a clear interface between the product layer and the reactant. The present study lays a theoretical foundation for controlling the oxidation of nickel-based superalloy powders from the powder process step.

关键词: electrode induction-melt inert gas atomization (EIGA), powder metallurgy (P/M), FGH4095 superalloy powders, supersonic nozzle, oxidation

Abstract:

Key words: electrode induction-melt inert gas atomization (EIGA), powder metallurgy (P/M), FGH4095 superalloy powders, supersonic nozzle, oxidation

中图分类号: (Kinetic theory of gases)

47.45.Ab

61.82.Bg (Metals and alloys) 68.08.-p (Liquid-solid interfaces) 68.35.Fx (Diffusion; interface formation)

峰山, 夏敏, 葛昌纯. Oxidation during the production of FGH4095 superalloy powders by electrode induction-melt inert gas atomization[J]. 中国物理B, 2018, 27(4): 44701-044701.

Shan Feng(峰山), Min Xia(夏敏), Chang-Chun Ge(葛昌纯). Oxidation during the production of FGH4095 superalloy powders by electrode induction-melt inert gas atomization[J]. Chin. Phys. B, 2018, 27(4): 44701-044701.

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Oxidation during the production of FGH4095 superalloy powders by electrode induction-melt inert gas atomization

Oxidation during the production of FGH4095 superalloy powders by electrode induction-melt inert gas atomization

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