Effects of Ti Microalloying on the Microstructure and Mechanical Properties of a Novel GH1059 Alloy for Nuclear Applications

doi:10.20057/j.1003-8620.2025-00098

Special Steel ›› 2025, Vol. 46 ›› Issue (4): 84-91.DOI: 10.20057/j.1003-8620.2025-00098

• Product Research and Development • Previous Articles

Effects of Ti Microalloying on the Microstructure and Mechanical Properties of a Novel GH1059 Alloy for Nuclear Applications

Wang　Jiaqi^1，2，3， Yao　Zhiqiang^1，3， Wu　Jinrong^1，2，3， Guan　Xianjun^1，3， Wu　Yunsheng^1，3， Zhao　Le^1，3， Qin　Xuezhi⁴， Zhou　Lanzhang^1，3

1 Shi-changxu Innovation Center for Advanced Materials， Institute of Metal Research， Chinese Academy of Sciences， Shenyang 110016，China；2 School of Materials Science and Engineering， University of Science and Technology of China， Shenyang 110016，China；3 CAS Key Laboratory of Nuclear Materials and Safety Assessment， Institute of Metal Research， Chinese Academy of Sciences， Shenyang 110016，China；4 State Key Laboratory of Advanced Marine Materials， Ningbo Institute of Materials Technology and Engineering， Chinese Academy of Sciences， Ningbo 315201，China

Received:2025-04-13 Online:2025-08-01 Published:2025-08-01

Ti微合金化对新型核用GH1059合金显微组织和力学性能的影响

王佳祺^1，2，3，姚志强^1，3，伍金荣^1，2，3，管现军^1，3，吴云胜^1，3，赵乐^1，3，秦学智⁴，周兰章^1，3

1 中国科学院金属研究所师昌绪先进材料创新中心，沈阳 110016； 2 中国科学技术大学材料科学与工程学院，沈阳 110016； 3 中国科学院金属研究所中国科学院核用材料与安全评价重点实验室，沈阳 110016；4 中国科学院宁波材料技术与工程研究所海洋关键材料全国重点实验室，宁波 315201

通讯作者: 赵乐
作者简介:王佳祺（1998—），男，博士
基金资助:
国家自然科学基金联合基金项目（No.U23A6016），宁波市科技创新2025重大专项（No. 2022Z199）

Abstract

Abstract: The influence of Ti microalloying on the microstructure and mechanical properties of a novel Fe-Ni-based superalloy GH1059 with high-strength， high-toughness and long-life for fast reactors was investigated using SEM， EBSD， and TEM. The results showed that the addition of Ti significantly increased the amount of Ti-rich MC carbides， which precipitated in a finer and more dispersed manner， while effectively suppressing the formation of M₂₃C₆ carbides at grain boundaries （GBs）. With increasing Ti content， the average grain size of the alloy gradually decreased， while the fraction of low-Σ coincidence site lattice （CSL） boundaries remained largely unchanged. The results of 750 ℃ tensile and room temperature impact properties showed that Ti microalloying can simultaneously improve both strength and toughness. The tensile fracture mode was a mixed-mode fracture， and the deformed microstructure was mainly composed of dislocation cells and sub-grains. The improvement in mechanical properties were primarily attributed to solid-solution strengthening by Ti atoms， precipitation strengthening from TiC， grain refinement， and enhanced GB bonding force.

Key words: Ti Microalloying, Fe-Ni-based Superalloy, Microstructure, Tensile Properties, Impact Toughness

摘要： 采用SEM、EBSD和TEM等表征方法，研究了Ti微合金化对快堆用新型高强韧长寿命铁镍基高温合金GH1059的组织特征和力学性能的影响。结果表明，Ti元素的添加明显增加了富Ti型MC碳化物的数量，并使得其以更弥散、细小的形式析出。同时，能够有效抑制晶界M₂₃C₆碳化物形成。随着Ti含量的增加，合金的平均晶粒尺寸逐渐减小，低重位点阵晶界比例无明显变化。750 ℃拉伸和室温冲击结果表明，Ti微合金化可以协同提高强度和韧性。合金的拉伸断裂模式均呈混合断裂特征，变形微观组织主要由位错胞和亚晶组成。合金力学性能的改善主要归因于Ti的固溶强化、TiC的析出强化、细晶强化及晶界结合力的增强。

关键词: Ti微合金化, 铁镍基高温合金, 微观组织, 拉伸性能, 冲击韧性

CLC Number:

TG142.73

Wang　Jiaqi, Yao　Zhiqiang, Wu　Jinrong, Guan　Xianjun, Wu　Yunsheng, Zhao　Le, Qin　Xuezhi, Zhou　Lanzhang. Effects of Ti Microalloying on the Microstructure and Mechanical Properties of a Novel GH1059 Alloy for Nuclear Applications[J]. Special Steel, 2025, 46(4): 84-91.

王佳祺, 姚志强, 伍金荣, 管现军, 吴云胜, 赵乐, 秦学智, 周兰章. Ti微合金化对新型核用GH1059合金显微组织和力学性能的影响[J]. 特殊钢, 2025, 46(4): 84-91.

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Effects of Ti Microalloying on the Microstructure and Mechanical Properties of a Novel GH1059 Alloy for Nuclear Applications

Ti微合金化对新型核用GH1059合金显微组织和力学性能的影响

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