Experimental and CPFEM based study on IN738LC superalloy processed by laser powder bed fusion
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In the last two decades, additive manufacturing (AM) is becoming a blooming market because of its excellent advantages compared to conventional processing. Laser powder bed fusion (L-PBF) is one of most commercially used techniques for metals and alloys among a variety of AM processes. Nickel based superalloys are broadly utilized in gas turbines engines, which always endure extremely high temperatures during operation. Consequently, in these alloys, the high temperature behavior is comparatively more relevant than room temperature behavior. There have been outstanding efforts on revealing the elastic performances under high temperature and building orientation effects on anisotropy of 3D printed nickel-based superalloys. However, research on plastic behavior of additive manufactured nickel-based superalloys is still limited. The aim of the present paper is to study the effect of the building orientation on the mechanical properties of IN738LC alloys produced by L-PBF at elevated temperature from the perspective of microstructure. CP-FEM model simulations were performed to determine the mechanical properties and study the mechanisms of deformation by comparing with experimental findings. Particular focus was put on the effect of temperature and building orientation.
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