Abstract
The effects of different thermostatic substrate heating (TSH) temperatures on the stress state, microstructures, and mechanical properties of laser directed energy deposited (LDEDed) Inconel 718 alloy were systematically investigated. The results showed that the optimized TSH temperature (200 °C) transformed the original tensile residual stresses into compressive residual stresses, improved microstructure uniformity, and enhanced the comprehensive mechanical properties of the LDEDed Inconel 718 alloy. When the TSH temperature was 200 °C, the ultimate tensile strength (UTS) and yield strength (YS) of the specimen perpendicular to the building direction (0°) did not change significantly, while the elongation (EL) value was improved by 35.2 %. It was attributed to reduced dislocation density in conjunction with the relaxation of residual stresses. In contrast, the UTS and YS in the specimen parallel to the building direction (90°) increased by 20.4 % and 34.9 %, respectively, whereas the EL values decreased slightly. It was due to the combined effects of the massively precipitated finer and more homogeneous γ'' phase and grain refinement. Finally, the strengthening mechanism of TSH on the microstructures and mechanical properties of the LDEDed Inconel 718 alloy were systematically revealed.
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