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Effects of applied pressure on the brazing of superplastic INCONEL 718 superalloy

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Abstract

A superplastic INCONEL 718 superalloy was brazed with a Ni-P and a Ni-Cr-P amorphous filler metal. The effects of applied pressure on the bonding strength, microhardness, and corrosion resistance were studied. The results showed that the brazements with Ni-Cr-P filler metal have higher bonding strength and better corrosion resistance than those with Ni-P filler metal using a conventional brazing method without applied pressure. When brazing was conducted under applied pressure, the bonding strength increased with applied pressure for the brazements with both filler metals. This was caused by a decrease of intermetallic phase through ejection of the liquid phase enriched with melting temperature depressants in the molten filler metals from the joint clearance. Corrosion tests show that these brazements failed at the brazed joint and at the grain boundaries in the region adjacent to the brazement.

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Authors and Affiliations

  1. the Department of Mechanical Engineering, Chung-Hua Polytechnic Institute, Taiwan, 300, Republic of China

    M. S. Yeh (Associate Professor)

  2. the Institute of Materials Science and Engineering, National Taiwan University, Taiwan, 106, Republic of China

    T. H. Chuang (Professor)

Authors
  1. M. S. Yeh
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  2. T. H. Chuang
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Yeh, M.S., Chuang, T.H. Effects of applied pressure on the brazing of superplastic INCONEL 718 superalloy. Metall Mater Trans A 28, 1367–1376 (1997). https://doi.org/10.1007/s11661-997-0273-5

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  • DOI: https://doi.org/10.1007/s11661-997-0273-5

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