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Effect of processing parameters on the microstructure and mechanical properties of wide-gap braze repairs on nickel-superalloy René 108

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Abstract

Gas turbine components experience large temperature gradients due to thermal cycling that often result in cracking. When brazing wide gaps greater than 500 μm in width, capillary action is inadequate to fill the joint and activated diffusion healing (ADH) is applied for repairs. ADH utilizes a mixture of a low melting temperature filler metal and an additive powder with a composition similar to that of the base metal. This research studies the effect of processing parameters on the microstructure and mechanical properties of repaired joints on DS René 108 superalloy. AWS BNi-2 and BNi-5 grade filler metals were mixed with MAR-M 247 alloy powder at weight percent ratios of 40:60, 50:50, and 60:40. For BNi-2 containing brazes, the mechanical properties improved with increasing additive powder. In contrast, the BNi-5 containing brazes showed an opposite trend. Brazing temperatures were held at 1200°C and 1232°C. The mechanical properties for both braze alloys improved at the higher brazing temperature. Diffusion hold temperatures were held at 1100°C and 1121°C for 2 h and 4 h. For the BNi-2 alloys, the higher temperature and longer brazing time improved mechanical properties. For the BNi-5 alloys, the lower brazing temperature and shorter brazing time improved mechanical properties.

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Acknowledgements

This work was performed under the NSF Ma2JIC Center program and the financial support from GE Power and Water is gratefully acknowledged. Special thanks go to Bryan Riggs at Ohio State University for the microhardness mapping.

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Authors and Affiliations

  1. Center for Welding, Joining, and Coatings Research, Colorado School of Mines, Golden, CO, 80401, USA

    Cheryl Hawk & Stephen Liu

  2. G. E. Power and Electric, Greenville, SC, 29615, USA

    Srikanth Kottilingam

Authors
  1. Cheryl Hawk
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  2. Stephen Liu
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  3. Srikanth Kottilingam
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Correspondence to Stephen Liu.

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Recommended for publication by Commission XVII - Brazing, Soldering and Diffusion Bonding

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Hawk, C., Liu, S. & Kottilingam, S. Effect of processing parameters on the microstructure and mechanical properties of wide-gap braze repairs on nickel-superalloy René 108. Weld World 61, 391–404 (2017). https://doi.org/10.1007/s40194-016-0420-y

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  • DOI: https://doi.org/10.1007/s40194-016-0420-y

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