Measurement and simulation of residual stresses in transient liquid phase bonded ferritic steels

Mesure et simulation des tension résiduelles dans des aciers ferritique soudés par TLPB

Nicolás Di Luozzo (1, 2, 3) , Sandra Cabeza (4) , Michel Boudard (5, 6, 7) , Marcelo Fontana (1, 2, 3)

1 FIUBA - Facultad de Ingeniería [Buenos Aires]
2 CONICET - Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires]
3 INTECIN - Instituto de Tecnologías y Ciencias de la Ingeniería "Hilario Fernández Long" [Buenos Aires]
4 ILL - Institut Laue-Langevin
5 LMGP - Laboratoire des matériaux et du génie physique
6 CNRS - Centre National de la Recherche Scientifique
7 UGA - Université Grenoble Alpes

Ferritic steel bars – 25 mm in diameter – were welded by transient liquid phase bonding (TLPB) using Fe based amorphous metallic foils as filler material. The resulting residual stress (RS) field shows a low peak magnitude – of 147 MPa – as measured by neutron diffraction. The most distinctive feature of TLPB is the heat input delivered simultaneously at the whole joint that allows much lower cooling rates compared with arc welding (AW). Therefore, the elapsed time between 800 and 500 ºC (t 8/5) was particularly long reaching 390 sec. As a result, a low RS peak magnitude (147 MPa) was obtained in the as welded condition. This value is well below the RS peak magnitude obtained with AW which typically attain the yield strength of the base metal (276 MPa). The numerical simulation of RS at the welded bars was performed by a thermal and mechanical analysis. It shows that TLPB produced a large austenized region, low cooling rates and a remarkable t 8/5. Consequently, the large volume in which the heat input is delivered is the driving force to reduce RS peak magnitudes. From the mechanical analysis, it was found that the simulated RS were in good agreement with the measured RS. Therefore, the proposed numerical simulation model can be used to predict RS in TLPB weldments.

Domaines: Sciences de l'ingénieur [physics]

Nicolás Di Luozzo, Sandra Cabeza, Michel Boudard, Marcelo Fontana. Measurement and simulation of residual stresses in transient liquid phase bonded ferritic steels. Journal of Materials Science, 2022, ⟨10.1007/s10853-022-07911-4⟩. ⟨hal-03858380⟩