A Review of the Evolution of Residual Stresses in Additive Manufacturing During Selective Laser Melting Technology

Materials, Journal Year: 2025, Volume and Issue: 18(8), P. 1707 - 1707

Published: April 9, 2025

Residual stress (RS) is one of the main reasons for component failure during an additive manufacturing (AM) process, especially using selective laser melting (SLM) technology. This paper reviews RS's investigation methods, formation mechanisms and regularities distribution. When considering recent research progress, studies indicate that dominant primarily attributed to thermal induced by significant temperature gradients rapid forming which subsequently transforms into RS upon cooling room temperature, as verified simulation experiments. Then, distribution are analyzed. SLM gradually increases when it measured from surface layer substrate. In plane direction, at center edge part, tensile stresses found; middle area, transition area compressive stress, whole remains in equilibrium state. Based on forementioned conclusions, three-dimensional diagram sample was constructed. Finally, strategic approaches mitigation briefly discussed. The excessive can be reduced process parameter matching, greatly remitted pre-treatment/post-treatment, so improve quality formed parts. review provides a valuable theoretical basis practical applications SLM.

Language: Английский

Tailored microstructure and enhanced high temperature behavior of TiC/Inconel 718 composites through dual-gradient printing strategy in direct energy deposition

Journal of Materials Processing Technology, Journal Year: 2024, Volume and Issue: unknown, P. 118679 - 118679

Published: Nov. 1, 2024

Language: Английский

Microstructural, Mechanical, and Tribological Properties of Selective Laser Melted Inconel 718 Alloy: The Influences of Heat Treatment

Crystals, Journal Year: 2024, Volume and Issue: 15(1), P. 18 - 18

Published: Dec. 27, 2024

The present study investigates the microstructural, mechanical, and tribological properties of Inconel 718 alloy produced by selective laser melting (SLM) in relation to heat treatment. SLM-processed samples received a two-step treatment: solutionizing at 1065 °C for 1 h, followed double aging 720 8 h 620 6 h. as-built sample exhibited grain structure mostly characterized fine Laves phases, while hardening phases γ′ ((Ni3 (Al, Ti)) γ″ (Ni3Nb) precipitated during Following treatment, transformation crystallographic texture dislocation density occurred, yielding random reduced density, particularly XZ direction, attributed formation new grains via recrystallization microstructure. size XY plane decreased following whereas <001> direction remained unaffected. heat-treated had significantly higher tensile strength (1330 MPa vs. 960 MPa) hardness (530 HV 340 HV) relative samples. wear resistance surpassed that due enhanced mechanical resulting from dispersed precipitates microstructure with

Language: Английский