Analysis of Solidification Microstructure in Additive Manufacturing by Multi-Phase Field Method

2017 ◽  
Vol 2017.30 (0) ◽  
pp. 197
Author(s):  
Yusuke SHIMONO ◽  
Mototeru Oba ◽  
Sukeharu NOMOTO ◽  
Yuichiro KOIZUMI ◽  
Akihiko CHIBA
Keyword(s):  
Additive Manufacturing ◽  
Phase Field ◽  
Field Method ◽  
Solidification Microstructure ◽  
Phase Field Method ◽  
Multi Phase

scholarly journals Non- and Quasi-Equilibrium Multi-Phase Field Methods Coupled with CALPHAD Database for Rapid-Solidification Microstructural Evolution in Laser Powder Bet Additive Manufacturing Condition

2021 ◽  
Author(s):  
Sukeharu Nomoto ◽  
Masahito Segawa ◽  
Makoto Watanabe
Keyword(s):  
Additive Manufacturing ◽  
Cooling Rate ◽  
Microstructural Evolution ◽  
Phase Field ◽  
Solidification Microstructure ◽  
Phase Field Method ◽  
Quasi Equilibrium ◽  
Cooling Rates ◽  
Multi Phase ◽  
Non Equilibrium

Solidification microstructure is formed under high cooling rates and temperature gradients in powder-based additive manufacturing. In this study, a non-equilibrium multi-phase field method (MPFM), which was based on a finite interface dissipation model proposed by Steinbach et. al., coupled with a CALPHAD database was developed for a multicomponent Ni alloy. A qua-si-equilibrium MPFM was also developed for comparison. Two-dimensional equiaxed micro-structural evolution for the Ni (Bal.)–Al–Co–Cr–Mo–Ta–Ti–W–C alloy was performed at various cooling rates. The temperature–γ fraction profiles obtained under 10^5 K/s using non- and qua-si-equilibrium MPFMs were in good agreement with each other. Over 10^6 K/s, the differences between non- and quasi-equilibrium methods grew as the cooling rate increased. The non-equilibrium solidification was strengthened over a cooling rate of 10^6 K/s. Colum-nar-solidification microstructural evolution was performed under cooling rates from 5×10^5 K/s to 1×10^7 K/s at various temperature gradient values under the constant interface velocity (0.1 m/s). The results showed that as the cooling rate increased, the cell space decreased in both methods, and the non-equilibrium MPFM agreed well with experimental measurements. Our results show that the non-equilibrium MPFM can simulate solidification microstructure in powder bed fusion additive manufacturing.

214 Topology optimization of microstructure applying a multi-phase field method

2015 ◽  
Vol 2015.28 (0) ◽  
pp. _214-1_-_214-2_
Author(s):  
Yoshiki Kamo ◽  
Junji Kato ◽  
Tomohiro Takaki ◽  
Takashi Kyoya
Keyword(s):  
Topology Optimization ◽  
Phase Field ◽  
Field Method ◽  
Phase Field Method ◽  
Multi Phase
Sign in / Sign up

Export Citation Format

Share Document