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Characterization of Diffusion Bonded W/Steel Joint by Electroplating-Assisted Hot Isostatic Pressing
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Affiliation:

1.National Key Laboratory of Science and Technology on High-Strength Structural Materials, Central South University, Changsha 410083, China;2.State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China

Fund Project:

Sponsored by State Key Laboratory for Mechanical Behavior of Materials (20202214); National Natural Science Foundation of China (51931012)

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    Abstract:

    The Ni coating of 10 μm in thickness was firstly deposited on the cylinder surface of pure tungsten by electrochemical deposition, and then the W/steel joint cylinders were prepared by the hot isostatic pressing (HIP) diffusion bonding process for nuclear component application. The HIP bonding parameters were set as 900 °C/100 MPa/1 h. The structure and composition analyses show that the metallurgical bonds are achieved with a tensile strength of about 236 MPa. However, the W/steel joint fractures at W substrate near the bonding interface due to the residual stress concentration. The Cu addition was used as the soft intermediate layer to release the residual stress by creep or yield mechanism, thereby improving the tensile strength of W/steel joint to about 312 MPa. The adhesive force of coating and the hardness distribution in the bonding interfaces were also discussed.

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[Ma Yunzhu, Wang Jianning, Liu Wensheng, Dai Zhengfei, Cai Qingshan. Characterization of Diffusion Bonded W/Steel Joint by Electroplating-Assisted Hot Isostatic Pressing[J]. Rare Metal Materials and Engineering,2022,51(7):2393~2399.]
DOI:10.12442/j. issn.1002-185X. E20210018

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History
  • Received:June 07,2021
  • Revised:September 18,2021
  • Adopted:September 27,2021
  • Online: August 03,2022
  • Published: July 27,2022