| The microstructure and mechanical performance optimization of a new Fe-Ni-based superalloy for Gen IV nuclear reactor: The critical role of Nb alloying strategy | |
| Wang, Jiaqi1,2; Qin, Xuezhi2,3,4; Cheng, Sihan1,2; Guan, Xianjun2,3; Zhou, Lanzhang2,3,4 | |
| Corresponding Author | Qin, Xuezhi(xzqin@imr.ac.cn) ; Zhou, Lanzhang(lzz@imr.ac.cn) |
| 2023-11-01 | |
| Source Publication | MATERIALS CHARACTERIZATION
 |
| ISSN | 1044-5803 |
| Volume | 205Pages:15 |
| Abstract | The effects of Nb alloying on microstructural evolution and mechanical performance of a newly developed solid -solution strengthened Fe-Ni-based superalloy, considered as the candidate material for high-temperature components manufacturing in fourth Generation (Gen IV) advanced nuclear reactor, were systematically investigated. The results show that the increase in the Nb content obviously increased the volume fraction and average size of MC carbides, and the MC carbides more preferentially distributed at grain boundaries. The average grain size and low sigma coincident site lattice (CSL) boundary exhibited a gradually decreased trend with increasing Nb content. Meanwhile, the thermal stability (grain size and grain boundary precipitation) of the alloy can be improved notably via Nb alloying. The tensile strength of Nb-alloyed alloys at 750 degrees C was enhanced significantly compared to that of Nb-free alloy, mainly due to the synergistic effect of solid-solution strengthening and fine grain strengthening. It was impressive that the variation of Nb content had no obvious influence on the yield strength, but gradually decreased the ultimate tensile strength. The detrimental effects of the decrease in sigma 3 boundaries and intergranular precipitates were assumed to restrict the strengthening factors. The ductility of Nb-alloyed alloys decreased remarkably due to the changed dominant deformation mechanism from planar slip to wavy slip; however, it showed an increasing trend in high Nb-content alloys due to the occurrence of dynamic recrystallization and grain rotation. The present work establishes Nb alloying as an effective method to optimize the microstructure and mechanical properties of solid-solution strengthened Fe-Ni-based superalloys, and the appropriate Nb content is recommended to be controlled below 0.5 wt% for this alloy. |
| Keyword | Fe -Ni -based superalloy Nb alloying Thermal stability Tensile property Deformation mechanism |
| Funding Organization | LingChuang Research Project of China National Nuclear Corporation |
| DOI | 10.1016/j.matchar.2023.113240 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | LingChuang Research Project of China National Nuclear Corporation |
| WOS Research Area | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing |
| WOS ID | WOS:001088216300001 |
| Publisher | ELSEVIER SCIENCE INC |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/177980 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Qin, Xuezhi; Zhou, Lanzhang |
| Affiliation | 1.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 2.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China 3.Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China 4.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, 72,Wenhua Rd, Shenyang 110016, Peoples R China |
| Recommended Citation GB/T 7714 | Wang, Jiaqi,Qin, Xuezhi,Cheng, Sihan,et al. The microstructure and mechanical performance optimization of a new Fe-Ni-based superalloy for Gen IV nuclear reactor: The critical role of Nb alloying strategy[J]. MATERIALS CHARACTERIZATION,2023,205:15. |
| APA | Wang, Jiaqi,Qin, Xuezhi,Cheng, Sihan,Guan, Xianjun,&Zhou, Lanzhang.(2023).The microstructure and mechanical performance optimization of a new Fe-Ni-based superalloy for Gen IV nuclear reactor: The critical role of Nb alloying strategy.MATERIALS CHARACTERIZATION,205,15. |
| MLA | Wang, Jiaqi,et al."The microstructure and mechanical performance optimization of a new Fe-Ni-based superalloy for Gen IV nuclear reactor: The critical role of Nb alloying strategy".MATERIALS CHARACTERIZATION 205(2023):15. |
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