Density determination and simulation of Inconel 718 alloy at normal and metastable liquid states

doi:10.1016/j.jmst.2017.10.014

J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (3): 436-439.DOI: 10.1016/j.jmst.2017.10.014

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Density determination and simulation of Inconel 718 alloy at normal and metastable liquid states

H.P. Wang, C.H. Zheng, P.F. Zou, S.J. Yang, L. Hu, B. Wei()

Department of Applied Physics, Northwestern Polytechnical University, Xi’an 710072, China

Received:2017-09-28 Revised:2017-10-20 Accepted:2017-10-23 Online:2018-03-20 Published:2018-03-20
About author:

Dr. Huang is currently an Associate Professor at Depart-ment of Mechanical Engineering, University of Hong Kong. He received his BEng and MSc in Solid Mechanics from Shanghai Jiao Tong University (SJTU) in 2002 and 2004, respectively, and his PhD in Materials Science from Delft University of Technology (TU Delft) in 2008. Dr. Huang was a Research Engineer at ArcelorMittal in Maizieres-les- Metz, France, from 2008 to 2010. In 2010, Dr. Huang joined University of Hong Kong as an Assistant Professor and was promoted to Associate Professor with tenure in 2016. He is an editorial board member of Materials Science and Tech-nology and Metallurgical and Materials Transactions A. Dr. Huang received twice the Outstanding Reviewer Award from Scripta Materialia. Dr. Huang’s works have been published in top journals of his research field including Science, Acta Materialia, Journal of Mechanics and Physics of Solids and International Journal of Plasticity. His current research inter-ests focus on two areas: (1) fundamentals of microstructure-property relationship and phase transformation of metals and alloys, and (2) development of lightweight high-strength steels for automotive applications. Both experimental and modelling works are involved in his research. Dr. Huang’s research projects include funda-mental projects as well as industry-oriented projects and have been well funded by General Research Fund, Innovation and Technology Fund, National Science Foun-dation of China, and industries from Europe and China (e.g. ArcelorMittal France, General Motors, Ansteel).

Abstract

Abstract:

The density of liquid Inconel 718 alloy was experimentally measured by electrostatic levitation technique, where the maximum undercooling of 100 K was realized for the commercial sample. The measured density of liquid Inconel 718 alloy is 7.39 g cm^-3 at the liquidus temperature of 1663 K which was confirmed by DSC experiment, with the linear temperature coefficient of -6.89 × 10^-4 g cm^-3 K^-1. Correspondingly, four ternary Ni-Cr-Fe compositions were designed to simulate the density of liquid Inconel 718 alloy with 16000 atoms, from which the liquid structure is revealed by pair distribution function. The predicted result shows a remarkable enhancement with the decrease of temperature at the first neighbor distance.

Key words: Undercooling, Density, Liquid metal and alloy, Levitation

H.P. Wang, C.H. Zheng, P.F. Zou, S.J. Yang, L. Hu, B. Wei. Density determination and simulation of Inconel 718 alloy at normal and metastable liquid states[J]. J. Mater. Sci. Technol., 2018, 34(3): 436-439.

Figures/Tables 4

Fig. 1. Thermal analysis and levitation processing of Inconel 718 alloy. (a) DSC curve; (b) temperature profile of levitated sample.

Fig. 2. Measured and calculated density of liquid Inconel 718 alloy. (a) Measured density and thermal expansion coefficient; (b) simulated density compared with experimental results; (c) enlarged part of measured and calculated density.

Table 1 Density of liquid Inconel 718 alloy and similar composition alloys.

Alloy	T_L (K)	ρ_L(g cm^‐3)	?ρ/?T (10^-4 g cm^-3 K^-1)	Ref.
Ni	1726	7.87	-6.73	[9]
Cr	2180	7.91	-11.9	[29]
Fe	1808	6.98	-5.81	[30]
Ni₅₁Cr₂₅ Fe₂₄	1679	7.32	-7.70	Present work
Ni₅₆Cr₂₃ Fe₂₁	1682	7.35	-7.79	Present work
Ni₆₀Cr₂₁ Fe₁₉	1685	7.37	-7.89	Present work
Ni₅₁Cr₃₀ Fe₁₉	1673	7.29	-7.46	Present work
Inconel 718 alloy	1663	7.39	-6.89	Present work

Fig. 3. Pair distribution functions g(r) of liquid Ni60Cr21Fe19 alloy. (a) Total g(r) from 1100 to 2000 K; (b) (c) and (d) g(r) heights at the first (R1), second (R2) and third (R3) neighbor distances.

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Density determination and simulation of Inconel 718 alloy at normal and metastable liquid states

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