Welding of Different Metals Across Ferritic Substrates: A Thermal Modeling | Original Article

ABSTRACT:

In the modern era, scientists are able to accurately predict the microstructural evolution of complex metallurgical systems, including the formation of phases at elevated temperatures over l.ong periods of time. Those calculations are useful because they provide insight without the need for laborious and costly experiments. Computational simulations are especially useful in the power generation industry, where the service parameters have a significant impact on the materials used. Dissimilar metal welds (DMWs) ranging in hardness from T23 to T91 will be the focus of this investigation into the application of thermodynamic simulations to their behaviour under hightemperature, creep-like conditions. Precipitation sequences in the base metals, as well as carbon migration in DMWs from the higher alloyed to the lower alloyed material at elevated temperatures, and the distribution of precipitates across the fusion line of the DMWs, are all calculated using the software MatCalc. The simulation results are validated by testing creep-exposed cross-weld samples at 80 MPa, 600 °C, and 625 °C for up to 14,000 hours.