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Comparative study on weldability of Ti-containing TWIP and AISI 304L austenitic steels through the autogenous-GTAW process

  • V. García-García
  • I. Mejía
  • F. Reyes-Calderón
ORIGINAL ARTICLE
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Abstract

In this study, a pair of welds was made in austenitic stainless steel AISI 304L and the novel twinning-induced plasticity (TWIP) steel microalloyed with titanium. Microstructural characterization and mechanical assessment were conducted with the aim to compare the weldability of both materials. The weld joints were performed in two passes by means of the autogenous gas tungsten arc welding (GTAW) process. The operating parameters were defined with the aid of penetration depth predictions carried out by a finite element (FE) numerical model. The results indicated that the weldability of TWIP-Ti steel compared to that of the AISI 304L steel had some advantages as the lower extension of the heat affected zone (HAZ) and a lower mechanical properties loss with respect to the base material. The ferritic solidification mode towards the outer of the FZ in the AISI 304L steel avoided hot cracking in the HAZ. Conversely, the HAZ of TWIP-Ti steel did not present hot cracking despite the austenitic solidification mode. The higher thermal diffusivity of the TWIP-Ti steel had a positive effect in the HAZ conditions improvement, which in turn was correlated with the welding cooling rates and microstructural aspects through the FEM model.

Keywords

TWIP-Ti AISI 304L GTAW FEM Weldability 

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Notes

Funding information

This study is supported by the National Council on Science and Technology (Consejo Nacional de Ciencia y Tecnología-México) during the project CB-2012-01-0177572. The present research project was also supported by the Coordinación de la Investigación Científica-UMSNH (México) (CIC-1.8). Víctor García’s studies were sponsored by the National Council on Science and Technology (Consejo Nacional de Ciencia y Tecnología-México), N.B. [577720].

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Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2018

Authors and Affiliations

  • V. García-García
    • 1
  • I. Mejía
    • 1
  • F. Reyes-Calderón
    • 2
  1. 1.Instituto de Investigación en Metalurgia y MaterialesUniversidad Michoacana de San Nicolás de HidalgoMoreliaMexico
  2. 2.Departamento de Metal Mecánica, Posgrado en Metalurgia / Doctorado en Ciencias en Ingeniería, Tecnológico Nacional de México / Instituto Tecnológico de MoreliaMoreliaMexico

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