Analysis of Solidification Microstructure and Segregation Tendency of Large N08120 Nickel-Based Alloy Ingot

Liu Yu; Zhang Xiaoman; Xu Wenliang

doi:10.20057/j.1003-8620.N250610

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Analysis of Solidification Microstructure and Segregation Tendency of Large N08120 Nickel-Based Alloy Ingot

Smelting and Solidification | 更新时间：2026-07-14

- Analysis of Solidification Microstructure and Segregation Tendency of Large N08120 Nickel-Based Alloy Ingot
- Special Steel Vol. 47, Issue 4, Pages: 67-73(2026)
- 作者机构：
  
  核电关键材料全国重点实验室，宝武特种冶金有限公司，上海 200940
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.N250610
  CLC： TG27
- Received：23 December 2025，
  
  Revised：2026-02-10，
  
  Accepted：11 February 2026，
  
  Published：30 July 2026
- 稿件说明：
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刘煜,张晓慢,徐文亮.大型N08120镍基合金铸锭的凝固组织及偏析倾向分析[J].特殊钢,2026,47(04):67-73.

Liu Yu,Zhang Xiaoman,Xu Wenliang.Analysis of Solidification Microstructure and Segregation Tendency of Large N08120 Nickel-Based Alloy Ingot[J].Special Steel,2026,47(04):67-73.
刘煜,张晓慢,徐文亮.大型N08120镍基合金铸锭的凝固组织及偏析倾向分析[J].特殊钢,2026,47(04):67-73. DOI： 10.20057/j.1003-8620.N250610.

Liu Yu,Zhang Xiaoman,Xu Wenliang.Analysis of Solidification Microstructure and Segregation Tendency of Large N08120 Nickel-Based Alloy Ingot[J].Special Steel,2026,47(04):67-73. DOI： 10.20057/j.1003-8620.N250610.

摘要

高端装备的大型化需求对镍基耐蚀合金大型铸锭的组织及偏析控制提出更为严苛的要求。本研究针对N08120合金20 t扁锭，利用金相显微镜、扫描电镜及电子探针等测试方法，开展了铸锭凝固组织及成分偏析倾向的分析，以期为工业生产评估大型镍基合金铸锭凝固质量，制定均匀化热处理工艺等提供指导。结果表明，铸锭细晶区和柱状晶区厚度分别约为5、116 mm，铸锭沿厚度方向无明显宏观成分偏析。从铸锭表层向铸锭中心过渡，枝晶形貌和二次枝晶臂间距（SDAS）均有显著变化，表层枝晶更为细小，柱状晶区枝晶干长度增加且有一定方向性，而中心等轴晶区枝晶粗大并失去方向性，SDAS从96 μm单调增至383 μm。枝晶间Cr、Nb、Mo为正偏析元素，C为负偏析元素，Ni和Fe无明显偏析倾向，偏析程度随位置从表层向铸锭心部逐渐增加，Nb的偏析会导致含Nb第二相析出。

Abstract

The demand for large-scale high-end equipment has imposed more stringent requirements on the microstructure and segregation control of large ingots of nickel-based corrosion-resistant alloys. In this paper， for a 20-ton flat ingot of N08120 alloy， testing methods such as metallographic microscope， scanning electron microscope and electron probe micro-analysis were used to analyze the solidification structure and composition segregation tendency of the ingot， aiming to provide guidance for evaluating the solidification quality of large nickel-based alloy ingots in industrial production and formulating homogenization heat treatment processes. The results showed that the thicknesses of the fine-grained zone and the columnar grain zone of the ingot were approximately 5 mm and 116 mm， respectively， and there was no significant macroscopic compositional segregation along the thickness direction of the ingot. From the surface to the center of the ingot， there were significant changes in both the dendrite morphology and the secondary dendrite arm spacing （SDAS）. The dendrites in the surface layer were finer， the dendrite trunk length in the columnar grain zone increased and exhibited a certain degree of orientation， while the dendrites in the central equiaxed grain zone were coarse and lost their orientation. And the SDAS increased monotonically from 96 μm to 383 μm. Among the elements， Cr， Nb， and Mo in the interdendritic regions were positive segregation elements， C was negative segregation element， and Ni and Fe showed no obvious segregation tendency. The degree of segregation gradually increased from the surface layer to the center of the ingot， and the segregation of Nb leads to the precipitation of Nb-containing second phases.

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references

刘海定，王东哲，魏捍东，等 . 高性能镍基耐腐蚀合金的开发进展［J］. 材料导报， 2013 ， 27 （ 5 ）： 99 - 105 .

张亨年，赵展，李澍，等 . 大锭型GH4169合金铸锭真空感应熔炼凝固过程及缩孔控制［J］. 中国有色金属学报， 2025 ， 35 （ 7 ）： 2287 - 2297 .

寇金凤，白亚冠，聂义宏，等 . C650R镍基合金大型锭铸态组织特征及均匀化工艺［J］. 特殊钢， 2025 ， 46 （ 4 ）： 100 - 106 .

葛洪硕，任一峰，张广军 . 8620系齿轮钢300 mm×340 mm铸坯宏观偏析改善［J］. 特殊钢， 2023 ， 44 （ 3 ）： 69 - 73 .

Kou S . A criterion for cracking during solidification ［J］. Acta Materialia ， 2015 ， 88 ： 366 - 374 .

张嘉惠，王治刚，李艳，等 . 冷氢化反应器的选材对比［J］. 中国化工装备， 2023 ， 25 （ 5 ）： 22 - 25 .

于艳，翟启杰，胡汉起 . 形核剂成分对高碳钢凝固过程的影响［J］. 铸造， 2004 ， 53 （ 8 ）： 606 - 608 .

安号，任兵芝，张益齐，等 . 电磁搅拌下连铸凝固与宏观偏析的研究进展［J］. 热加工工艺， 2025 ， 54 （ 1 ）： 12 - 16+23 .

Wang B T X ， Wu Y X ， Liu W Q ， et al . Roles of Al/Ni ratio and solidification cooling rate in grain boundary engineering of Al x CrFeMnNi （2-x） high entropy alloy ［J］. Materials Characterization ， 2024 ， 218 ： 114507 .

Vandersluis E ， Ravindran C . Comparison of measurement methods for secondary dendrite arm spacing ［J］. Metallography， Microstructure， and Analysis ， 2017 ， 6 （ 1 ）： 89 - 94 .

欧阳伟豪，周健，高鹏，等 . 铌含量对H13钢枝晶偏析及碳化物组成和形貌的影响［J］. 机械工程材料， 2022 ， 46 （ 12 ）： 43 - 49 .

刘煜，徐文亮 . N08120镍基合金厚板生产全流程Z相析出规律研究［J］. 特殊钢， 2023 ， 44 （ 5 ）： 83 - 89 .

Zhao L ， Song Y ， Zhai G C ， et al . Effect of cooling rate on solidification microstructure， microsegregation， and nanoprecipitates in medium carbon CrMo cast steel ［J］. Journal of Materials Research and Technology ， 2024 ， 31 ： 635 - 648 .

匡泓旭，董艳伍，姜周华，等 . 铸态GH4975合金中偏析元素扩散及析出相回溶动力学特性［J］. 大型铸锻件， 2024 （ 5 ）： 14 - 19 .

Zhang Z Y ， Pan Y W ， Chen Z F ， et al . Effect of cooling rate on the solidification behavior and elemental segregation in a cast NiCoCr-based superalloy ［J］. Journal of Materials Research and Technology ， 2025 ， 39 ： 189 - 201 .

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