| Elimination of 8-ferrite in N50 steel and its effect on cryogenic mechanical properties | |
| Zhai, Ruzong1,2,3; Zhang, Honglin1,3; Xu, Bin1,3; Liu, Sheng1,2,3; Xie, Bijun1,3; Sun, Mingyue1,3 | |
| Corresponding Author | Xu, Bin(bxu@imr.ac.cn) |
| 2022-09-01 | |
| Source Publication | CRYOGENICS
 |
| ISSN | 0011-2275 |
| Volume | 126Pages:12 |
| Abstract | 8 ferrite serves as a detrimental phase in TF (Toroidal Field) superconducting magnet jacket pipe materials. The distribution features of ferrite in N50 casting and forging were investigated, and the cryogenic mechanical properties with different ferrite content were studied accordingly. The results indicated that the non-equilibrium crystallization leads to the solidification mode gradually changing from AF (Austenitic-ferritic) at the surface to the FA (Ferritic-austenitic) at the center of the casting. The skeleton 8 ferrites induced by interdendritic segre-gation could disappear almostly after annealing while the tangled lath 8 ferrite at the center of casting caused by the more serious segregation seems to be stable. Based on thermodynamics calculations and through changing the Cr and Ni content according to the Espy diagram, the stable ferrites can be eliminated when the Creq/Nieq is less than 1.25. From fractography, the cryogenic impact toughness of N50 steel would be deteriorated because more secondary cracks were taken place by the mismatched deformation between the harder residual 8 ferrites and matrix. Though the elimination of 8 ferrites caused a slight decrease in cryogenic tensile strength, it greatly improved the cryogenic impact toughness. |
| Keyword | 8 ferrite Cr-Ni equivalent ratio Cryogenic Mechanical properties |
| Funding Organization | National Key Research and Development Program ; Key Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; IMR Innovation Foundation ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Ling Chuang Research Project of China National Nuclear Corporation ; Youth Innovation Promotion Association of CAS |
| DOI | 10.1016/j.cryogenics.2022.103522 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Key Research and Development Program[2017YFE0301403] ; Key Program of the Chinese Academy of Sciences[ZDRW-CN-2021-2-4-2] ; National Natural Science Foundation of China[52173305] ; National Natural Science Foundation of China[52101061] ; China Postdoctoral Science Foundation[2020M681004] ; IMR Innovation Foundation[2022-PY12] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDC0400000] ; Ling Chuang Research Project of China National Nuclear Corporation ; Youth Innovation Promotion Association of CAS |
| WOS Research Area | Thermodynamics ; Physics |
| WOS Subject | Thermodynamics ; Physics, Applied |
| WOS ID | WOS:000880086300002 |
| Publisher | ELSEVIER SCI LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/176546 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Xu, Bin |
| Affiliation | 1.Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China |
| Recommended Citation GB/T 7714 | Zhai, Ruzong,Zhang, Honglin,Xu, Bin,et al. Elimination of 8-ferrite in N50 steel and its effect on cryogenic mechanical properties[J]. CRYOGENICS,2022,126:12. |
| APA | Zhai, Ruzong,Zhang, Honglin,Xu, Bin,Liu, Sheng,Xie, Bijun,&Sun, Mingyue.(2022).Elimination of 8-ferrite in N50 steel and its effect on cryogenic mechanical properties.CRYOGENICS,126,12. |
| MLA | Zhai, Ruzong,et al."Elimination of 8-ferrite in N50 steel and its effect on cryogenic mechanical properties".CRYOGENICS 126(2022):12. |
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