Implemented in-situ heat treatment process for controlling the residual thermal stresses during the fabrication of Ti-6Al-4V titanium alloy through additive manufacturing
Journal
Materials Letters
Journal Volume
356
Date Issued
2024-02-01
Author(s)
Abstract
The aim of this study is to eliminate the conventional heat treatment process and save on associated equipment, time, energy, and professional labor costs. In this work, an in-situ heat treatment scanning strategy has been implemented to control the thermal residual stress produced during the fabrication of Ti-6Al-4V titanium alloy through the selective laser melting (SLM) manufacturing process. The laser scanning was performed twice: first, it was used for melting and bonding the powder to build the samples, and second, it was used to remove the residual stress. Additionally, the laser power variation impact was also analyzed from 100 W to 300 W. It has been found that the strength and ductility both improved by 20–25 %. The microstrain and dislocation density were also analyzed and found that the significant reduction in microstrain and dislocation denticity after in-situ heat treatment.
Subjects
Dislocation density | In-situ heat treatment | Residual stress | SLM process | Ti-6Al-4V alloy
SDGs
Type
journal article