| Abstract Scope |
The Inconel 718 (IN718) is one of the most widely used Ni-based superalloy in additive manufacturing, due to its high weldability and high temperature strength. However, recent attempts in additively manufacturing IN718 by the Selective Laser Melting (SLM) technique however reported much inferior creep properties comparing to the conventional IN718. This particularly limited the implementation of SLM in aerospace application, and more in-depth research on how to improve the creep performance of SLM IN718 is urgently needed. In this study, the as-SLMed IN718 were post-heat treated to obtain different microstructure features and their creep properties were compared. Meanwhile, a microstructure-based creep model was built to understand the creep mechanisms for SLMed IN718. This study provides a comprehensive understanding on microstructure evolution under different heat treatment conditions and how different factors (grain structure, Laves phase, carbides) affect the creep performance of SLMed IN718. |