About this Abstract |
| Meeting |
11th Conference on Trends in Welding Research + Additive Manufacturing (TWR+AM)
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| Symposium
|
11th Conference on Trends in Welding Research + Additive Manufacturing (TWR+AM)
|
| Presentation Title |
Effect of Welding Process-Induced Thermo-Mechanical Cycling on Ductility Dip Cracking
in Welds of High-Cr Ni-base Filler Metals |
| Author(s) |
Boian Alexandrov, Anil Singh, John Welsh, Yuxiang Luo, Mason Pacenta, Michael Mills |
| On-Site Speaker (Planned) |
Boian Alexandrov |
| Abstract Scope |
We present a new approach for quantifying the effect of thermo-mechanical cycling, induced by the welding process, on DDC in welds austenitic alloys. Finite element analysis (FEA) of such welds revealed a complex, three-dimensional asymmetric fatigue loading in the as-solidified weld metal. The combined effect of stress and strain on DDC is quantified by the spatial distribution of process-imposed mechanical energy (IME). The proposed approach is demonstrated through FEA process modeling and extensive metallurgical characterization of welds in high-Cr Ni-base filler metal welds. Physical simulation of dynamic recrystallization (DRX) followed by strain-to-fracture testing revealed a direct correlation between the extent of IME, DRX, and DDC in such welds. The results of this study are utilized in development of a fixed displacement thermal cycling (FDTC) test for DDC susceptibility. FEA process simulations combined with FDTC testing can identify process- and design-based approaches for mitigating DDC in high-Cr Ni-base filler metals welds. |
| Proceedings Inclusion? |
Undecided |