Abstract
The relationship between the microstructure , mechanical properties and martensitic phase transformation of N-containing Co–26Cr–5Mo–5W alloys by selective laser melting (SLM ) is studied. The high-resolution transmission electron microscope and X-ray diffraction observations show that two phases (ε and γ phase) co-exist in N-free alloys. In contrast, a significant decrease of ε phase is observed in N-containing alloys. It is believed that the stabilization of γ phase in N-containing alloys results from the lattice distortion and Si-rich fine-distributed precipitates that block the motion of dislocations. Both the ultimate tensile strength and 0.2% proof strength can be significantly improved by nitrogen addition. Interestingly, the elongation slightly increases as well. They are ~1385 MPa, ~1140 MPa, and ~18.4% for 0.08 N-containing Co–26Cr–5Mo–5W alloys, respectively. It is clear that nitrogen addition during the SLM processing could be a promising strategy to fabricate Co–Cr–Mo–W alloys with an excellent combination of strength and ductility by suppressing face-centered cubic (fcc) → hexagonal close-packed (hcp) martensitic phase transformation .
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The use of facilities in the State Key Laboratory for Powder Metallurgy and the Institute for Materials Microstructure at Central South University is acknowledged.
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Wang, B., An, X., Liu, F., Song, M., Ni, S., Liu, S. (2019). Influence of Nitrogen on Microstructure, Mechanical Properties and Martensitic Phase Transformation of Co–26Cr–5Mo–5W Alloys by Selective Laser Melting. In: TMS 2019 148th Annual Meeting & Exhibition Supplemental Proceedings. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-05861-6_40
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DOI: https://doi.org/10.1007/978-3-030-05861-6_40
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