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Tailoring the microstructure evolution and mechanical properties for a novel N-doping NiCoCr-based superalloy processed by heat treatment after additive manufacturing
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AI
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J
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DOI：10.1016/j.msea.2026.150899.png)
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Abstract
En 中文
Nitrogen (N), as the most abundant interstitial element, can effectively enhance the yield strength of alloys through the effect of interstitial solid-solution strengthening. Moreover, N-doping can be conveniently and rapidly incorporated into alloys through additive manufacturing technology. However, for additive-manufactured alloys, heat treatment is a necessary procedure to increase the mechanical properties by promoting the precipitation of nanoscale phases. Here, we have conducted a study about the evolution of mechanical properties for an N-doping NiCoCr-based superalloy processed by additive manufacturing and heat treatment. The results show that the strength of this superalloy with N-doping reaches 1334.58 MPa, and the plasticity reaches 12.10% after the standard heat treatment. The N-doping can inhibit the precipitation of γ′ phase through N preferentially binding with Al and Ti, while the pinning effect of the grain boundary brought by the continuous precipitation of carbonitride and the grain refinement effect can achieve the improvement of comprehensive mechanical properties. These findings shed new light on the design concept of NiCoCr-based superalloy and processing optimization to promote the mechanical properties of the superalloy.
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3.7W
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