过热度、传热系数以及高斯分布参数对Ag-28Cu-2Ni合金凝固组织的影响

doi:10.11896/cldb.18070192

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Abstract Based on the CAFE method (cellular automaton-finite element coupling model), the three-dimensional microstructure under the water-cooled copper mold casting conditions was simulated with the help of Procast software, the simulation results are in agreement with the experimental results. In addition, the effect of the process parameters (superheat and heat transfer coefficient) and the Gauss distribution parameters (the nucleation undercooling (ΔTv(s),_max), the maximum nucleation density (nv(s),max), and the standard deviation of nucleation undercooling (ΔT_v(s),σ) on the solidification structure of the alloy was also studied. The simulation results show that with the increase of superheat, the proportion of columnar crystals gradually increases, the grain size of the fine columnar crystals increases, and the CET (columnar to equiaxed transition) transformation position shifts to the interior of the alloy casting. Under the condition of water cooling (h=5 000 W/(m²·K)), the solidification structure of Ag-28Cu-2Ni alloy is almost all columnar crystals, and the grain is coarse. Under the condition of air cooling (h=2 000 W/(m²·K)), the columnar crystal region shrinks, and the equiaxed crystal area occupy the major part. Under the condition of slow cooling (h=10 W/(m²·K)), the solidification structure of the casting is almost entirely equiaxed crystals. Furthermore, the higher the mean undercooling, the larger the columnar dendrite zones, and the larger the maximum nucleation density, the smaller the size of grains. The larger the standard deviation, the more discrete the grain distribution, and the more uniform the grain size distribution.

Key words： cellular automata-finite element (CAFE) microstructure superheat heat transfer coefficient Gaussian distribution parameter

Published: 31 July 2019

CLC number:

TG21

Fund:This work was supported by the National Key Research and Development Program of China (2017YFB0305700), National Natural Science Foundation of China (U1602271, 51707087, U1602275), Major Science and Technology Projects in Yunnan Province (2018ZE011, 2018ZE012, 2018ZE022, 2018ZE026) and Yunnan Basic Applied Research Program (2018FB088).

About author:: Jiheng Fang, graduated from Kunming Institute of Precious Metals in 2017, majoring in materials scie-nce. In the same year, he entered the powder room of the research and development center for Kunming Institute of Precious Metals. He mainly engaged in solidification experiments and computational simulation of precious metals. In recent years, he has published or included 8 SCI/EI papers as the first author.
Ming Xie, doctoral tutor, researcher. He was awarded the “Special Allowance” by the State Council Government and the “Yunling Scholar” in Yunnan Province. Hosted and participated in the completion of more than 50 major scientific and technological projects such as the national “Eighth Five-Year” scientific and technological research, 863 Plan, National Science and Technology Support Plan, National Foundation Key Projects (NSFC-Yunnan Joint Fund), National Key Military Industry, Ministry of Industry and Information Technology Strong Foundation Project, 2017 national key research and development plan and so on. He has
won 16 national, provincial and ministerial scientific and technological progress awards, and 1 first prize of Yunnan Science and Technology Progress Science and Technology Innovation Team; more than 20 national invention patents, and more than 100 academic papers published in influential acade-mic journals and conferences at home and abroad. Among them, more than 30 articles were included in SCI and EI; more than 10 national military stan-dards, national standards and enterprise standards were written, and he participated in the writing of Handbook of Powder Metallurgy, Encyclopedia of Materials, Application Manual for Electrical Alloy Products, etc.

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	FANG Jiheng
	LIU Xi
	XIE Ming
	HU Jieqiong
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	ZHANG Jiming
	YANG Youcai
	CHEN Yongtai
	WANG Saibei
	LI Zaijiu

Cite this article:

FANG Jiheng,LIU Xi,XIE Ming, et al. Effect of Superheat, Heat Transfer Coefficient and Gaussian Distribution Parameters on Solidification Structure of Ag-28Cu-2Ni Alloy[J]. Materials Reports, 2019, 33(18): 3077-3084.

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http://www.mater-rep.com/EN/10.11896/cldb.18070192 OR http://www.mater-rep.com/EN/Y2019/V33/I18/3077

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