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Effect of aging treatment on the microstructures and mechanical properties evolution of 25Cr-20Ni austenitic stainless steel weldments with different Nb contents
Zhang, Xu; Li, Dianzhong; Li, Yiyi; Lu, Shanping
2019-04-01
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume35Issue:4Pages:520-529
AbstractThe 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.
Keyword25Cr-20Ni steel Weld metal Nb Aging treatment alpha-Cr phase Mechanical property
Indexed BySCI
Language英语
WOS IDWOS:000455967200008
PublisherJOURNAL MATER SCI TECHNOL
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/81245
Collection中国科学院金属研究所
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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