Numerical prediction of the microstructure of weld heat affected zone (HAZ) in SMAW weld deposits on Cr-Mo-V steel

摘要

The methodology for predicting the dimensions of the areas occupied by different grain sizes within the heat affected zone (HAZ) of a weld bead applied to a thick plate of low-alloy 1.25Cr-1Mo-0.25V steel using the SHAW process, based upon knowledge of weld bead dimensions, welding process variables and the basic metallurgy of the HAZ, allows us to satisfactorily calculate the microstructure within the HAZ for given welding parameters. The results obtained from predicting the dimensions of the areas occupied by different sizes of grains within the HAZ of a weld bead support the use of this model to simulate the microstructure of the HAZ in multi-layer welds with the aim of successfully refining thick bainite grains from the HAZ and improving the effectiveness of the joint during the welding process.