Influencia do insumo de calor na corrosão interglanular dos aços AISI-316 soldados pelo processo MIG

AUTOR(ES)
DATA DE PUBLICAÇÃO

1995

RESUMO

The study of welding materiaIs play an important role in the development of the end-technology in manufacturing today. The Cr-Ni austenitic stainless steel may undergo different metallurgic transformation during and after the welding. These transformations can provoke irredeemable defects on the welded pieces during its lifetime. Due to the negative influence on the intergranular corrosion of the Cr-Ni austenitic stainless steel, the M IND.23 C IND.6 carbide precipitation is considered one of the more important problem in the welding of this material. The M IND.23 C IND.6 carbide formation is fundamentally affected by factors as chemical composition of the material, its microstructure and the thermal regime (rate temperature/time) imposed during the welding. The present work investigates the influence of the different heat inputs (IC) on the M IND.23 C IND.6 carbide precipitation in the heat affected zone (HAZ). The welds analyzed were made using metal inert gas (MIG) welding process on 4 mm AISI 316 steel sheets and filler metal of both ER-316L and ER-316L Si. Data acquisition was carried out automatically using an A/D card coupled to a microcomputer. Intergranular corrosion was tested following the ASTM-A708-79 norm. Different techniques of optical microscopy, scanning electron microscopy, qualitative and quantitative chemical microanalysis by dispersive energy , X rays difractometry and X rays images were used to verify the presence of intergranular corrosion. Diversely of the common observations founded in the literature, the phenomenon of intergranular corrosion was not verified in the experiments of this study, despite the different welding conditions applied.No presence of M IND.23 C IND.6 carbide was detected

ASSUNTO(S)

aço inoxidavel austenitico carbonetos arco de soldagem a gas de metal corrosão e anticorrosivos

ACESSO AO ARTIGO

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