Wide-Gap Brazing of K417G Alloy Assisted by In Situ Precipitation of M3B2 Boride Particles
作者： Zhun Cheng , Xiaoqiang Li , Minai Zhang , Shengguan Qu , Huiyun Li
DOI: 10.3390/MA13143140
关键词: Alloy 、 Superalloy 、 Boride 、 Materials science 、 Brazing 、 Microstructure 、 Ultimate tensile strength 、 Powder metallurgy 、 Powder mixture 、 Composite material
摘要: In this study, K417G Ni-based superalloy with a 20-mm gap was successfully bonded at 1200 °C using powder metallurgy mixture. The results indicated that the microstructure and mechanical properties of as-bonded alloy were highly dependent on brazing time (15–45 min), mainly due to precipitation distribution characteristics M3B2 boride particles. Specifically, brazed for 30 min exhibited desirable properties, such as high tensile ultimate strength 971 MPa an elongation fracture 6.5% room temperature, exceeding balance value (935 MPa) base metal. excellent plasticity coherent strengthening dispersion in situ spherical equiaxed particles γ + γ′ matrix. addition, disappearance dendrites homogenization are other factors cannot be excluded. This technique, which can avoid eutectic transformation traditional brazing, provides new effective method wide-gap repair materials.
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