Enhanced High Temperature Mechanical Properties of TiCp Reinforced Inconel 718 by Laser Powder Directed Energy Deposition

Abstract

The demand for composite materials with heightened mechanical strength at elevated temperatures has driven interest in their development. This study employs laser powder directed energy deposition (LPDED) to examine the mechanical properties of Inconel 718 composite powders with varying TiCp concentrations at both room and high temperatures. During LPDED, TiCp dissolves into the matrix, forming (Nb, Ti)Cp and altering solidification characteristics. (Nb, Ti)Cp not only prevents Laves phase formation during LPDED but also effectively inhibits grain growth in subsequent heat treatment. Additionally, dissolved carbon atoms impede dislocation mobility, significantly impacting mechanical properties. This investigation underscores the intricate transformations achievable through precise TiCp control in LPDED, offering valuable insights into the development of high-performance metal matrix composites for high-temperature applications.