What the study found
The study found that post-deposition heat treatment changed the mechanical behavior of WAAM-CMT (Wire Arc Additive Manufacturing with Cold Metal Transfer) deposited Inconel 718. Annealing at 1100 °C for two hours followed by furnace cooling improved strength and hardness, but slightly reduced impact toughness.
Why the authors say this matters
The authors conclude that this trade-off offers an optimal balance for specific engineering requirements. They also suggest that WAAM-CMT fabricated and heat-treated Inconel 718 shows promise for engineering applications that demand high performance and durability.
What the researchers tested
The researchers fabricated an Inconel 718 wall using the WAAM-CMT process and compared specimens in the as-deposited condition with specimens after post-deposition heat treatment. They evaluated tensile behavior, impact toughness, and microhardness, and examined the microstructure with optical microscopy, x-ray diffraction (XRD), and scanning electron microscopy (SEM) of fractured samples.
What worked and what didn't
According to the abstract, annealing at 1100 °C for two hours followed by furnace cooling improved strength and hardness. The same treatment slightly reduced impact toughness, indicating a trade-off between these properties.
What to keep in mind
The abstract does not provide detailed numerical results, so only the direction of the changes is available here. It also does not describe sample size, statistical analysis, or broader testing conditions.
Key points
- The study compared as-deposited and heat-treated Inconel 718 walls made by WAAM-CMT.
- Annealing at 1100 °C for two hours with furnace cooling increased strength and hardness.
- Impact toughness decreased slightly after the heat treatment.
- The researchers used tensile tests, impact tests, microhardness measurements, optical microscopy, XRD, and SEM.
- The authors describe the treated material as promising for engineering applications.
Disclosure
- Research title:
- Heat treatment improved strength and hardness in WAAM Inconel 718
- Authors:
- Amit Sharma, Shankar Singh, Vivek Kumar
- Institutions:
- Sant Longowal Institute of Engineering and Technology, Sant Longowal Institute of Engineering and Technology, Sant Longowal Institute of Engineering and Technology
- Publication date:
- 2026-03-30
- OpenAlex record:
- View
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