Grain Refinement and Strengthening Mechanisms of In-situ Follow-up Hammering-Assisted Wire Arc Additive Manufacturing for Hydraulic Turbine Blade Repairing

Xiaochen Xiong; Xunpeng Qin; Lin Hua; Gang Wan; Shilong Wei; Mao Ni; Zeqi Hu

doi:10.1007/s12540-022-01335-0

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자료유형: 학술저널

저자정보: Xiaochen Xiong (Wuhan University of Technology) Xunpeng Qin (Wuhan University of Technology) Lin Hua (Wuhan University of Technology) Gang Wan (China Yangtze Power Co. Ltd) Shilong Wei (Yellow River Water Conservancy and Hydropower Development Corporation Co. Ltd) Mao Ni (Wuhan University of Technology) Zeqi Hu (Wuhan University of Technology)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.29 No.6

발행연도: 2023.6

수록면: 1,796 - 1,814 (19page)

DOI: 10.1007/s12540-022-01335-0

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An in-situ follow-up hammering-assisted (FH) wire arc additive manufacturing (WAAM) process is proposed for hydraulicturbine blade repairing. With different hammering intervention temperatures above the austenite recrystallization temperature(Tre-γ), the influence and mechanism of the process on the grain size of prior austenite grains and room-temperaturemartensite, as well as the texture of 0Cr13Ni5Mo deposited layers are systematically studied. The OM, SEM and EBSD areused for characterization. The repairing layer of large-sized blade is dominated with the coarse columnar grains with severalmillimeters in length, and the grain size is rated as grade 0. After the FH process, the prior austenite grains are significantlyrefined to grade 8. As the hammering temperature increases, the recrystallized austenite grains gradually grow and coarsenowing to the higher ambient temperature. FH at 950 ℃, a temperature slightly higher than the Tre-γ can achieve the austenitegrains with excellent grain refinement effect. Meanwhile, thanks to microstructure inheritance, the room-temperature martensiticis also refined from 4.69 to 2.47 μm, and the typical < 100 > fibre texture content in the deposited layer is obviouslyreduced with the texture intensity reduced from 6.68 to 2.95. Furthermore, the yield strength is increased by about 200 MPa.The main strengthening mechanisms are grain refinement strengthening and dislocation strengthening, and the contributionsto the yield strength are 96.1 MPa and 79 MPa respectively. Additionally, the FH process is also expected to simultaneouslyimprove the formability of the blade repaired layer.

#Hydraulic turbine blade repairing · In-situ follow-up hammering · Wire arc additive manufacturing · Grain refinement · Strengthening mechanism

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