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| Creep behavior and damage evolution of T92/Super304H dissimilar weld joints |
| Xiao-wei Zhai1, Jin-feng Du2, Lin-ping Li2, Chao Zhou2, Zheng Zhang1 |
| 1 School of Material Science and Engineering, Beihang University, Beijing 100191, China;
2 Shenhua Guohua (Beijing) Electric Power Research Institute Co., Ltd., Beijing 100025, China |
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Abstract Creep tests of T92/Super304H joints were performed at 923 K under the stress of 85–165 MPa. Microstructure evolution was characterized by light microscopy, scanning electron microcopy and transmission electron microscopy to probe the relationship between creep performance deterioration and microstructure evolution. Results showed that for all the creep tests, failure occurred at fine-grained heat-affected zone of T92, and the joints have lower creep strength than the base metal T92. However, as the stress increased from 85 to 165 MPa, the creep fracture changed from a mixed mode, i.e., intergranular fracture in the center part and transgranular fracture in the edge part to total transgranular fracture. The longer the creep life, the greater is the proportion of the intergranular fracture. The M23C6 coarsened and the Laves phase precipitated along grain boundaries during long-term creep. Vacancies nucleate and propagate at the interface between coarse M23C6, Laves phase and matrix. Finally, cracks forming along grain boundaries are responsible for intergranular fracture.
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Received: 05 February 2018
Published: 09 May 2018
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| Cite this article: |
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Xiao-wei Zhai,Jin-feng Du,Lin-ping Li, et al. Creep behavior and damage evolution of T92/Super304H dissimilar weld joints[J]. Journal of Iron and Steel Research International, 2019, 26(7): 751-760.
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| [2] |
Hai-sheng Chen Yong-qin Wang, Wei-qi Du Liang Wu Yuan-xin Luo,. Fatigue–creep interaction based on continuum damage mechanics for AISI H13 hot work tool steel at elevated temperatures[J]. , 2018, 25(5): 580-588. |
| [3] |
Zhi-gang Xie, ? Yan-ming He ? Jian-guo Yang ? Xiang-qing Li ? Chuan-yang Lu ? Zeng-liang Gao. Microscopic damage mechanism of SA508 Gr3 steel in ultra-high temperature creep[J]. , 2018, 25(4): 453-459. |
| [4] |
Fa-cai Ren . He Wang . Xiao-ying Tang . Fei Chen. Creep rupture behavior and microstructural evolution of modified 9Cr–1Mo heat-resistant steel[J]. , 2018, 25(12): 1303-1307. |
| [5] |
Long Guo , . Yun-huan Sui . Xing-zhong Zhang. High-temperature creep constitutional model ofQ460E steel and effect of creep on bulging deformation of continuous casting slab[J]. , 2018, 25(11): 1123-1130. |
| [6] |
Yu-cheng Lei,,*,Xiao-kai Guo,Hong-xia Chang,Tian-qing Li,,Qiang Zhu,Gang Chen, Long-ren Xiao. Cavitation erosion behavior of CLAM steel weld joint in liquid lead-bismuth eutectic alloy[J]. Chinese Journal of Iron and Steel, 2017, 24(9): 935-942. |
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2019, Vol. 26 
