Carlos Roberto Xavier

TL;DR: In this paper, the microstructural changes that occur when Duplex Stainless Steels (DSS) are welded could be evaluated when bead-on-plate welding was carried out on a 2205 DSS by the GMAW process.

TL;DR: In this article, two DSS and one SDSS were welded by autogenous Tungsten Inert Gas (TIG) by three different heat inputs, and microstructural, mechanical, and electrochemical analysis was performed.

TL;DR: In this article, a model based on transport equations was numerically implemented by the finite volume method (FVM) in a computational code in order to simulate the influence of the heat input, base metal thickness and preheating temperature on the thermal evolution and cooling rate during the welding of the low alloy ferritic steels T/P23 and T /P24.

Abstract: A phenomenological model to predict the multiphase diffusional decomposition of the austenite in low-alloy hypoeutectoid steels was adapted for welding conditions. The kinetics of phase transformations coupled with the heat transfer phenomena was numerically implemented using the Finite Volume Method (FVM) in a computational code. The model was applied to simulate the welding of a commercial type of low-alloy hypoeutectoid steel, making it possible to track the phase formations and to predict the volume fractions of ferrite, pearlite and bainite at the heat-affected zone (HAZ). The volume fraction of martensite was calculated using a novel kinetic model based on the optimization of the well-known Koistinen-Marburger model. Results were confronted with the predictions provided by the continuous cooling transformation (CCT) diagram for the investigated steel, allowing the use of the proposed methodology for the microstructure and hardness predictions at the HAZ of low-alloy hypoeutectoid steels.

TL;DR: In this article, a model based on transport equations was numerically implemented by the finite volume method in a computational code in order to simulate the 2205 duplex stainless steels (DSSs) welding.