The role of addition of Ni on the microstructure and mechanical behaviour of C-Mn weld metals

Autores

  • Vicente Braz da Trindade UNI-SIEGEN
  • João da Cruz Payão Universidade Federal do Rio Janeiro
  • Luís Felile Guimarães Souza Centro Federal de Educação Tecnológica
  • Ronaldo da Rocha Paranhos Universidade Estadual do Norte Fluminense

DOI:

https://doi.org/10.5585/exacta.v5i1.1037

Palavras-chave:

Microconstituent martensite-austenite (M-A). Nickel effect. Submerged arc welding. Weld metal

Resumo

The aim in this work is to study the influence of nickel content (as-welded state and after stress relief heat treatment) on the microstructure and toughness of CMn weld metals obtained with submerged arc welding. The nickel content vary between 0.50 wt.% and 3.11 wt.%. The microstructures were observed using optical microscopy (OM) and scanning electron microscopy (SEM). The toughness was evaluated by Charpy-V impact testing in samples cut transversally to the weld bead. The impact energy showed that nickel content up to 1 wt.% improves the toughness due to the increase of the acicular ferrite (AF) content and microstructural refinement. On the other hand, higher nickel contents have a deleterious effect on the toughness due to the presence of the microconstituent martensite-austenite (M-A) in the weld metal. The stress relief heat treatment did not improve too much the weld metal toughness, even the M-A suffering decomposition (ferrite+carbide). This may be explained by the precipitation of carbides along the boundaries of the ferrite.

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Biografia do Autor

Vicente Braz da Trindade, UNI-SIEGEN

Pesquisador – University of Siegen Engenheiro de Projetos da Vallourec&Mannesmann Dusseldórfia – RNV [Alemanha]

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Publicado

30.06.2007

Como Citar

Trindade, V. B. da, Payão, J. da C., Souza, L. F. G., & Paranhos, R. da R. (2007). The role of addition of Ni on the microstructure and mechanical behaviour of C-Mn weld metals. Exacta, 5(1), 177–183. https://doi.org/10.5585/exacta.v5i1.1037

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