Numerical simulation and process optimization of new Ni-based GH4151 superalloy for electroslag remelting

被引：1

作者：

Jia L. ^{[1
]}

Cui H. ^{[1
]}

Yang S.-F. ^{[2
]}

Lü S.-M. ^{[3
]}

Xie X.-F. ^{[3
]}

Qu J.-L. ^{[3
]}

Miao Q.-D. ^{[4
]}

机构：

[1] Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing

[2] State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing

[3] Beijing GAONA Materials &Technology Co., Ltd., Beijing

[4] State Key Laboratory for Comprehensive Utilization of Vanadium and Titanium Resources, Pangang Group Institute Co., Ltd., Panzhihua

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2023年 / 33卷 / 09期

基金：

中国国家自然科学基金;

关键词：

dendrite spacing; electro-slag remelting; high alloying; melting rate; Ni-based superalloy; slag thickness;

D O I：

10.11817/j.ysxb.1004.0609.2023-43910

中图分类号：

学科分类号：

摘要：

The GH4151 alloy is a high alloying, deformation-resistant high-temperature alloy. Element segregation in the smelting process tends to cause large cracks in the ingot. MeltFlow-ESR commercial numerical simulation software has been used in this study, together with on-site electroslag smelting techniques, to simulate the primary and secondary dendrite arm spacing of the as-cast structure of GH4151 nickel-based superalloy electroslag ingots. The analysis has been undertaken of the slag pool temperature and the morphology of the metal melt under different electroslag remelting conditions seeking a suitable smelting process to reduce trial-and-error costs. The results indicate that as the melting rate increases (130−210 kg/h), the temperature of the slag pool first rises then falls, and the dendrite arm spacing increases. The appearance of the metal melt gradually changes from a “U” shape to a “V” shape, and there is a certain linear relationship between the depth of the melt pool and the melting rate. The effect of slag quantity on melt pool volume is more complex. At a melt speed of 140 kg/h, as the slag quantity increases from 50 kg to 75 kg, the depth of the melt pool increases from 199 mm to 205 mm; whereas at a melt speed of 180 kg/h, as the slag quantity increases from 67 kg to 120 kg, the depth of the melt pool decreases. Through industrial trials, defect-free large-diameter d 450 mm electroslag cast ingots have been obtained with no shrinkage porosity or cracking. The thickness of the slag skin is 1.78 mm. The experimental measurements of the dendrite arm spacing are basically consistent with the results of the simulations, indicating that this simulation software can be used to predict the dendrite arm spacing of electroslag ingots. © 2023 Central South University of Technology. All rights reserved.

引用

页码：2873 / 2889

页数：16

共 24 条

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