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Restoration of XM-25 turbine blades via ded laser cladding: microstructural evolution and mechanical performance
An Tiancheng, Olena Berdnikova
ІЕЗ ім. Є.О. Патона НАН України. 03150, м. Київ, вул Казимира Малевича, 11.High-strength martensitic precipitation-hardened stainless steel XM-25, widely used in low-pressure steam turbine blades, faces severe surface wear and water erosion during service. This study presents the restoration of large XM-25 blades via Directed Energy Deposition (DED) laser cladding using parent material powder, followed by aging treatment at 480 °C for 4 hours. The cladding process parameters were optimized to achieve defect-free metallurgical bonding. Comprehensive characterization, including non-destructive testing (PT, RT), microstructural analysis (OM, SEM, EDS, XRD), microhardness measurement, tensile testing, and high-cycle fatigue testing (R = 0.1), was conducted to evaluate the repaired blades. Results show that the cladded layers exhibit refined martensitic structures with uniformly dispersed precipitation-strengthening phases, microhardness up to 400 HV0.2, tensile strength exceeding 1200 MPa, and yield strength above 1050 MPa. Residual stress in the cladding area is approximately 30 % of the base material, and the fatigue limit reaches 95 % of the substrate, indicating excellent mechanical performance. The study demonstrates that DED laser cladding with subsequent aging is a reliable engineering solution for restoring XM-25 turbine blades, enhancing structural integrity, fatigue resistance, and surface durability.
Restoration of XM-25 turbine blades via ded laser cladding: microstructural evolution and mechanical performance
An Tiancheng, Olena Berdnikova
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Collection of abstracts of scientific and technical seminars: "3D PRINTING OF METAL PRODUCTS" (May 27, 2025) and "NON-DESTRUCTIVE TESTING AND TECHNICAL CONDITION MONITORING" (May 28, 2025)
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(May 27, 2025)
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Publication of scientific articles in "The Paton Welding Journal" is free
2021.08.07 Proceedings of X International Conference Mathematical Modeling and Information Technologies in Welding and Related Processes
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