Determining the Influence of Braze Temperature on the Dissolution Behaviour and Kinetics of Isothermal Solidification During Transient Liquid Phase Bonding (TLPB) Ni-Based Superalloys

Abstract

A method for measuring the full liquid width of a braze joint during TLPB was developed based on enthalpy of solidification values obtained from DSC and microstructural measurements. This differs from most techniques in the literature which only measure the centreline eutectic width using metallographic methods. Comparison of full liquid width and eutectic only measurements confirmed that the rate of isothermal solidification and gap widening due to dissolution is underestimated, particularly at higher braze temperatures, when relying on eutectic measurements only. However, the time for complete isothermal solidification is the same whether considering the full liquid width or eutectic width. The underestimation of the IS rate by eutectic centreline measurements increases as the braze temperature increases above the filler liquidus temperature. The DSC enthalpy measurements were used to build a TLPB processing map for a range of braze temperatures and starting filler metal interlayer thickness. This map can predict the degree of gap widening and the time for complete isothermal solidification for this gap. Results indicate that an optimum braze temperature exists where the apposing influences of gap widening and increased IS rate combine to give the shortest IS completion time.

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Acknowledgments

Thanks to Thomas Georges, Francesco D’Angelo and Elizabeth Kendrick of Pratt and Whitney Canada for the contributions and guidance with this work.

Funding

This study was funded by the Government of Canada under the Natural Sciences and Engineering Council and Pratt and Whitney Canada under the Industrial Research Chair program.

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Correspondence to S. F. Corbin.

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The research described in this paper was partially funded by Pratt and Whitney Canada (P&WC). The work was carried out with guidance and communication with P&WC personnel

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Manuscript submitted September 14, 2020; accepted December 21, 2020.

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Corbin, S.F., Tadgell, C.A. Determining the Influence of Braze Temperature on the Dissolution Behaviour and Kinetics of Isothermal Solidification During Transient Liquid Phase Bonding (TLPB) Ni-Based Superalloys. Metall Mater Trans A 52, 1232–1247 (2021). https://doi.org/10.1007/s11661-021-06143-6

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