Alloys for Additive Manufacturing Symposium 2022 (AAMS22)

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Alloy and Process Optimization for Additive Manufacturing using CALPHAD Tools

Presenter: A.N. Grundy
Date: 12 September 2022
Time: 2:30pm – 2:50pm
Location: Small lecture hall
Session Name: Modelling and Simulations

Abstract

Computational thermodynamics (CALPHAD) is a powerful tool widely applied in materials science for alloy design or process optimization. Thermodynamic databases developed through the CALPHAD approach can predict thermodynamic properties as well as the phase equilibria of commercial and also novel multi-component alloys.

Using Thermo-Calc and its add-on kinetic tools DICTRA for diffusion and TC-PRISMA for precipitation and growth calculations, important material properties relevant to additive manufacturing (AM) can be calculated. The following case studies for the AM of steels, nickel superalloys, titanium and aluminium alloys are presented:

• Calculation of the solidification range and its importance for predicting cracking susceptibility.
• Calculation of microsegregation during AM and consequences for the precipitation of unwanted phases and the formation of martensite and retained austenite.
• Consequences of microsegregation on the post-build heat treatment strategy for eliminating composition gradients in the part.
• Strategies for improving solidification microstructure.
• Exploiting the cyclic thermal load of successive weld passes during AM for intrinsic heat treatment by precipitation and growth.

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