The influence of alloying elements on heat-resistance of Ni-based filler metals and brazed joints

Keywords

high-temperature vacuum brazing, brazing filler metal, nickel superalloy, heat resistance, oxidation depth, adhesive-active elements.

Cite as

Maksymova S. V., Voronov V. V., Kovalchuk P. V., and Zvolinsky I. V. The influence of alloying elements on heat-resistance of Ni-based filler metals and brazed joints. Physicochemical Mechanics of Materials. 2022. 58(5), 081-086.

Abstract

The influence of adhesive-active elements on the heat resistance of the experimental Ni–Cr–Co–Al–(Ti, Nb, W, Mo, Zr)-based filler and brazed joints of nickel superalloy ZhS6U made these fillers are analyzed. Doping with zirconium (>2 wt%) has been found to significantly impair the heat resistance of both the brazing filler metal and the brazed joints. It is shown that it is possible to partially compensate the negative effects of zirco­nium, due to increased doping with chromium. It is noted that the additional doping with chromium (up to 15 wt%) can increase the heat resistance of nickel filler metal by almost 30%. It is also found that additional alloying with titanium and niobium instead of zirco­nium allows obtaining a level of heat resistance of both filler metal and brazed joint close to the values of the base metal – heat-resistant nickel superalloy ZhS6U.

References

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