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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Thermo-mechanical Response of Materials with Special Emphasis on In-situ Techniques
Presentation Title Rationalization of Heterogeneous Creep Deformation Behavior of Dissimilar Metal Welds
Author(s) Mohan Subramanian, Sudarsanam Suresh Babu, Jonathan Galler, John DuPont, Zhili Feng, Xinghua Yu
On-Site Speaker (Planned) Mohan Subramanian
Abstract Scope Dissimilar metal welds (DMWs) made between 2.25Cr-1Mo steel (BCC matrix) and Alloy 800H (FCC matrix) using Inconel filler metal are typically used in the steam generator of power plants. However, under extreme loading conditions at high temperature, these joints fail prematurely in service. To rationalize this premature failure to underlying microstructure evolution, simulated creep tests were performed on samples extracted from these dissimilar weld configurations after different levels of aging. Local creep strain measurements made using Digital Image Correlation (DIC) in these tests confirmed accelerated creep at BCC region close to the FCC/BCC interfaces and their steady state creep rate was observed to be 6.01 x 10-5 hr-1, as against the global steady state creep rate of 1.01 x 10-5 hr-1 for a creep test condition: 625C, 50MPa. The above heterogeneous creep deformation was correlated to underlying microstructure evolution.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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