Element evaporation and as-cast structures of a new Ni-Co-based Superalloy affected by the second smelting power of electron beam smelting layered solidification technology

IF 2.6 3区材料科学 Q2 ENGINEERING, MANUFACTURING International Journal of Material Forming Pub Date : 2025-03-19 DOI:10.1007/s12289-025-01890-y

Lin Yang, Rusheng Bai, Yi Tan, Ying Yang, Pengting Li

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Abstract

Compared with traditional smelting technology, the GH4068 alloy prepared by electron beam smelting layered solidification technology (EBS-LST) has a more uniform microstructure and lower microsegregation. To further optimize the as-cast microstructure of GH4068 alloy, the element volatilization, microstructure and microsegregation of GH4068 alloy prepared by EBS-LST of different second layer smelting powers were studied. The experimental results show that element volatilization gradually aggravates with the increase of smelting power, and the volatilization of Cr element is the most obvious. By analyzing the cross-sectional microstructures of ingots, it is found that the dendrite zone gradually reduces, while the cellular dendrite zone and cellular structure zone gradually increase with the increase of smelting power. The secondary dendrite arm spacing of ingots with the smelting power of 10 kW, 12 kW and 14 kW are 55.9 μm, 48.1 μm and 42.1 μm, respectively, which are all smaller than the ingot prepared by traditional duplex melting is 65.8 μm. The microsegregation of ingots in the dendrite zone is the most serious, and the size of precipitated phases in the cellular structure zone is the biggest. Therefore, considering the above experimental results, this paper believes that 12 kW is the better second layer smelting power.

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一种新型镍钴基高温合金的元素蒸发和铸态组织受电子束熔炼层状凝固技术二次熔炼功率的影响

与传统熔炼工艺相比，电子束熔炼层状凝固技术（EBS-LST）制备的GH4068合金具有更均匀的组织和更低的微偏析。为了进一步优化GH4068合金的铸态组织，研究了不同第二层冶炼功率的EBS-LST制备的GH4068合金的元素挥发、显微组织和微偏析。实验结果表明，随着冶炼功率的增大，元素挥发逐渐加剧，其中Cr元素挥发最为明显。通过对钢锭断面组织的分析发现，随着冶炼功率的增大，枝晶区逐渐减少，胞状枝晶区和胞状组织区逐渐增多。熔炼功率为10 kW、12 kW和14 kW时，铸锭的二次枝晶臂间距分别为55.9 μm、48.1 μm和42.1 μm，均小于传统双熔炼铸锭的65.8 μm。铸锭在枝晶区微偏析最严重，在胞状组织区析出相尺寸最大。因此，综合上述实验结果，本文认为12 kW是较好的第二层冶炼功率。

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来源期刊

International Journal of Material Forming ENGINEERING, MANUFACTURING-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

5.10

自引率

4.20%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal publishes and disseminates original research in the field of material forming. The research should constitute major achievements in the understanding, modeling or simulation of material forming processes. In this respect ‘forming’ implies a deliberate deformation of material. The journal establishes a platform of communication between engineers and scientists, covering all forming processes, including sheet forming, bulk forming, powder forming, forming in near-melt conditions (injection moulding, thixoforming, film blowing etc.), micro-forming, hydro-forming, thermo-forming, incremental forming etc. Other manufacturing technologies like machining and cutting can be included if the focus of the work is on plastic deformations. All materials (metals, ceramics, polymers, composites, glass, wood, fibre reinforced materials, materials in food processing, biomaterials, nano-materials, shape memory alloys etc.) and approaches (micro-macro modelling, thermo-mechanical modelling, numerical simulation including new and advanced numerical strategies, experimental analysis, inverse analysis, model identification, optimization, design and control of forming tools and machines, wear and friction, mechanical behavior and formability of materials etc.) are concerned.