A numerical model for simulating the effect of strain rate on eutectic band thickness
Artikel i vetenskaplig tidskrift, 2020

Large tensile strains acting on the solidifying weld metal can cause the formation of eutectic bands along grain boundaries. These eutectic bands can lead to severe liquation in the partially melted zone of a subsequent overlapping weld. This can increase the risk of heat-affected zone liquation cracking. In this paper, we present a solidification model for modeling eutectic bands. The model is based on solute convection in grain boundary liquid films induced by tensile strains. The proposed model was used to study the influence of strain rate on the thickness of eutectic bands in Alloy 718. It was found that when the magnitude of the strain rate is 10 times larger than that of the solidification rate, the calculated eutectic band thickness is about 200 to 500% larger (depending on the solidification rate) as compared to when the strain rate is zero. In the paper, we also discuss how eutectic bands may form from hot cracks.

Hot cracking

Macrosegregation

Alloy 718

Solidification

Författare

J. Draxler

Högskolan Väst

P. Akerstrom

Luleå tekniska universitet

J. Edberg

Luleå tekniska universitet

L. -E. Lindgren

Luleå tekniska universitet

Sukhdeep Singh

Chalmers, Industri- och materialvetenskap, Material och tillverkning

T. Raza

Högskolan Väst

J. Andersson

Högskolan Väst

Welding in the World, Le Soudage Dans Le Monde

0043-2288 (ISSN)

Vol. In Press

Ämneskategorier

Teknisk mekanik

Annan materialteknik

Metallurgi och metalliska material

Styrkeområden

Materialvetenskap

DOI

10.1007/s40194-020-00918-y

Mer information

Senast uppdaterat

2020-07-31