Microstructure modelling of laser metal powder directed energy deposition of alloy 718
Artikel i vetenskaplig tidskrift, 2019

A multi-component and multi-phase-field modelling approach, combined with transformation kinetics modelling, was used to model microstructure evolution during laser metal powder directed energy deposition of Alloy 718 and subsequent heat treatments. Experimental temperature measurements were utilised to predict microstructural evolution during successive addition of layers. Segregation of alloying elements as well as formation of Laves and δ phase was specifically modelled. The predicted elemental concentrations were then used in transformation kinetics to estimate changes in Continuous Cooling Transformation (CCT) and Time Temperature Transformation (TTT) diagrams for Alloy 718. Modelling results showed good agreement with experimentally observed phase evolution within the microstructure. The results indicate that the approach can be a valuable tool, both for improving process understanding and for process development including subsequent heat treatment.

DED

Thermal cycle

Modelling

Heat treatment

Phase-field

Författare

Andreas Segerstark

GKN Aerospace Sweden

Chamara Kumara

Högskolan Väst

Fabian Hanning

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Nikhil Dixit

Högskolan Väst

Shrikant Joshi

Högskolan Väst

Johan Moverare

Högskolan Väst

Linköpings universitet

Per Nylen

Högskolan Väst

Additive Manufacturing

2214-8604 (eISSN)

Vol. 25 357-364

Ämneskategorier

Bearbetnings-, yt- och fogningsteknik

Annan materialteknik

Metallurgi och metalliska material

Styrkeområden

Materialvetenskap

DOI

10.1016/j.addma.2018.11.024

Mer information

Senast uppdaterat

2018-12-05