Improvement of the mechanical properties of TC17 alloy by different heat treatments through directed energy deposition
Source abstract
Abstract
The microstructure evolution of TC17 alloy fabricated by directed energy deposition (DED) under different heat treatments was investigated, and its effects on tribological and mechanical properties were analyzed. The results indicated that the deposited TC17 alloy consisted of acicular α` martensite and residual β phase. Annealing at 840 °C and solution treatment at 800 °C promoted the precipitation and growth of lath and plate-like primary α phase (α P), as well as continuous and discontinuous grain boundary α phase (α GB). A phase free zone (PFZ) was observed adjacent to the continuous α GB. Aging induced the preferential precipitation of secondary α phase (α S) around the grain boundaries, but it did not fully occupy the PFZ region. As the aging temperature increased, both the α P and α S underwent coarsening. Heat treatment effectively enhanced the wear resistance of the TC17 alloy, with a wear rate of only 0.0343 mg/m after aging at 580 °C. The deposited TC17 alloy exhibited average tensile strength of 1224 MPa and average elongation of 1.2 %. Compared to the deposited samples, the average tensile strengths of the aging treatments at 580 °C, 630 °C, and 680 °C decreased by approximately 12.66 %, 15.28 %, and 18.06 %, respectively; while the average elongation increased by 475 %, 691.67 %, and 600 %, respectively.
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Research context
OpenAlex topics: Additive Manufacturing Materials and Processes · High Entropy Alloys Studies · Metal and Thin Film Mechanics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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