| Effect of aging treatment on the microstructures and mechanical properties evolution of 25Cr-20Ni austenitic stainless steel weldments with different Nb contents | |
| Zhang, Xu1,2,3; Li, Dianzhong3; Li, Yiyi3; Lu, Shanping3 | |
| Corresponding Author | Lu, Shanping(shplu@imr.ac.cn) |
| 2019-04-01 | |
| Source Publication | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
 |
| ISSN | 1005-0302 |
| Volume | 35Issue:4Pages:520-529 |
| Abstract | The microstructure evolutions and the mechanical properties of the 25Cr-20Ni austenitic stainless steel weld metals with different Nb contents were investigated during the long term aging treatment at 700 degrees C. M23C6 Nb(C, N),alpha-Cr phase and Nb-nitride phase (Z phase) were observed in the microstructures of the aged weld metals. The results showed that the alpha-Cr phase precipitated in the interdendritic regions of the weld metals after being exposed to 700 degrees C for 500 h and the element Nb accelerated the precipitation of the alpha-Cr phase significantly. The density of the alpha-Cr phase decreased with the increase of the distance away from the primary Nb(C, N). Additionally, the alpha-Cr phase showed a crystallographic relationship with the austenitic matrix, [1 (1) over bar(1) over bar] (alpha-Cr) // [1 (1) over bar0](gamma) and (01 (1) over bar)(alpha-Cr) // ((1) over bar(1) over bar1)(gamma). It was observed that the Z phase precipitated in the periphery of the Nb(C, N) and may replace the Nb(C, N) after long term exposure to high temperature. The transformation of the Nb(C, N) into Z phase suggested that the Z phase had a higher stability than the Nb(C, N) particles at 700 degrees C for long term aging. The tensile strength of the Nb-bearing weld metal showed a continuous decrease at the initial stage of the aging treatment and then went up slightly with the prolonged aging time. However, the elongations and the impact energies of the weld metals decreased monotonously with the increase of the aging time. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology. |
| Keyword | 25Cr-20Ni steel Weld metal Nb Aging treatment alpha-Cr phase Mechanical property |
| Funding Organization | research and development of nuclear materials and service safety assurance technology ; National Natural Science Foundation of China (NSFC) |
| DOI | 10.1016/j.jmst.2018.10.017 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | research and development of nuclear materials and service safety assurance technology[ZDRW-CN-2017-1] ; National Natural Science Foundation of China (NSFC)[51474203] |
| WOS Research Area | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:000455967200008 |
| Publisher | JOURNAL MATER SCI TECHNOL |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/131274 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Lu, Shanping |
| Affiliation | 1.Chinese Acad Sci, Key Lab Nucl Mat & Safety Assessment, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Peoples R China 3.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China |
| Recommended Citation GB/T 7714 | Zhang, Xu,Li, Dianzhong,Li, Yiyi,et al. Effect of aging treatment on the microstructures and mechanical properties evolution of 25Cr-20Ni austenitic stainless steel weldments with different Nb contents[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2019,35(4):520-529. |
| APA | Zhang, Xu,Li, Dianzhong,Li, Yiyi,&Lu, Shanping.(2019).Effect of aging treatment on the microstructures and mechanical properties evolution of 25Cr-20Ni austenitic stainless steel weldments with different Nb contents.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,35(4),520-529. |
| MLA | Zhang, Xu,et al."Effect of aging treatment on the microstructures and mechanical properties evolution of 25Cr-20Ni austenitic stainless steel weldments with different Nb contents".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 35.4(2019):520-529. |
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