• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2025, Vol. 61 ›› Issue (2): 162-171.doi: 10.3901/JME.2025.02.162

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Study on Microstructure and Properties of 18Ni-350 Maraging Steel by Wire and Arc Addictive Manufacturing with Ultrasonic Impact Treatment

YANG Chunpan1, WANG Xiaowei1, LI Xuesong2, YANG Dongqing1, HUANG Yong1, PENG Yong1, WANG Kehong1   

  1. 1. Key Laboratory of Controlled Arc Intelligent Additive Technology, Ministry of Industry and Information Technology, Nanjing University of Science and Technology, Nanjing 210094;
    2. Offshore Oil Engineering Co., Ltd., Tianjin 300461
  • Received:2024-01-09 Revised:2024-09-25 Published:2025-02-26

Abstract: Wire and arc additive manufacturing of maraging steels with coarse dendritic crystals resulted in worse mechanical properties. In response to this phenomenon, the straight wall of 18Ni-350 maraging steel is fabricated by wire and arc additive manufacturing with ultrasonic impact treatment(UIT). The mechanical properties and microstructure of 18Ni-350 maraging steel with UIT are investigated. The results showed the UIT suppressed the formation of coarse dendritic crystals, changed the morphology of grain growth and refined the grain. Compared with directly deposited samples, the austenite content of UIT samples remained unchanged, while size is decreased and more homogeneously distributed. In addition, precipitated phases of Ni3Ti are observed in the directly deposited samples, while no precipitated phases are observed in the UIT samples. After solution+aging treatment, the UIT samples produced recrystallization phenomenon. Meanwhile, the transverse and longitudinal tensile strength reached 2079.5 MPa and 2109.5 MPa respectively, with the ultimate elongation reaching 6.95%. The mechanical properties of the UIT samples are satisfied than the directly deposited samples. The response effect of ultrasonic impact on age hardening is more significant.

Key words: maraging steel, ultrasonic impact treatment, wire and arc additive manufacturing, microstructure, mechanical property

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