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Deformation Mechanism and Microstructure Evolution of T92/S30432 Dissimilar Welded Joint During Creep

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Abstract

The cross dissimilar welds between T92 martensitic steel and S30432 austenitic steel were crept at 625 °C with different applied stresses, and the creep deformation and microstructure behaviors were characterized. The results revealed that the creep deformation behavior of dissimilar weld joint was controlled by its martensitic T92 part due to the Ni-based filler metal employed. The fracture positions of crept dissimilar welded joints were located in base metal of T92 steel as the applied stress over than 140 MPa. The fracture type was mainly caused by plastic deformation and characterized by dimples and surface necking. In contrast, as applied stress was <140 MPa, fractured location was transferred into the fine-grained heat-affected zone of T92 part identified to be the intergranular brittle fracture. This phenomenon was controlled by creep deformation and related to undissolved carbides, fine grain size and constraint effect induced by creep deformation inconsistent in this zone.

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Acknowledgments

This research work was financially supported by Project of National Natural Science Foundation of China (Grant No. 51505328), Key Project in the Science and Technology Pillar Program of Tianjin (Grant No. 11ZCKFGX03000) and Distinguished-Reserved Academic Program of Tianjin University.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China

    Lianyong Xu, Yongfa Wang, Hongyang Jing, Lei Zhao & Yongdian Han

  2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin, 300072, China

    Lianyong Xu, Yongfa Wang, Hongyang Jing, Lei Zhao & Yongdian Han

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  1. Lianyong Xu
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  2. Yongfa Wang
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Correspondence to Lei Zhao.

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Xu, L., Wang, Y., Jing, H. et al. Deformation Mechanism and Microstructure Evolution of T92/S30432 Dissimilar Welded Joint During Creep. J. of Materi Eng and Perform 25, 3960–3971 (2016). https://doi.org/10.1007/s11665-016-2254-6

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  • DOI: https://doi.org/10.1007/s11665-016-2254-6

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