A numerical model for simulating the effect of strain rate on eutectic band thickness
Journal article, 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.

Macrosegregation

Alloy 718

Solidification

Hot cracking

Author

J. Draxler

University West

P. Akerstrom

Luleå University of Technology

J. Edberg

Luleå University of Technology

L. -E. Lindgren

Luleå University of Technology

Sukhdeep Singh

Chalmers, Industrial and Materials Science, Materials and manufacture

T. Raza

University West

J. Andersson

University West

Welding in the World, Le Soudage Dans Le Monde

0043-2288 (ISSN)

Vol. 64 10 1635-1658

Subject Categories

Applied Mechanics

Other Materials Engineering

Metallurgy and Metallic Materials

Areas of Advance

Materials Science

DOI

10.1007/s40194-020-00918-y

More information

Latest update

10/6/2020