Efecto de las velocidades de enfriamiento sobre la resistencia a la corrosión en juntas soldadas de acero al carbón AISI SAE 1045

Abstract

In this project were analyzed AISI SAE 1045 steel specimens welded for electric arc to joints T, top and overlap, which through thermographic pictures taken during the welding process and analyzed in the FLIR software temperatures were identified in three points each specimen, one in the melting zone, the other on heat affected zone and the last point in the base material, this allows make cooling graphs respect to time, these results were compared with the TTT diagram of the study material and also with the metallographic analysis were observed and analyzed the micro structural components in the base material was perlite while the fusion zone and the heat affected zone is bainite due to the isothermal transformation from austenite to each specimen type. To conclude this analysis the samples were subjected to non-destructive testing hardness profiles following the norm ASTM E18 and microhardness following the norm ASTM E384, nothing that in the heat affected zone toughness was improved compared with other areas of the material. Finally, was studied the behavior of the samples against corrosion by testing salt spray tested in accordance with ASTM B-117 carried out for a period of one hundred hours thus determining the loss of material in inches lost per year (mpy) concluding that the temperatures reached in the welding process did not influence the corrosion resistance.