Abstract
In this study, microstructural evolutions and phase selection phenomena during laser deposition of a hardfacing Ni-Cr-B-Si-C alloy at different processing conditions are experimentally investigated. The results show that even minor variations in the thermal conditions during solidification can modify the type and morphology of the phases. Higher undercoolings obtained at faster cooling rates suppressed the primary borides and encouraged floret-shape mixtures of Ni and Cr5B3 via a metastable reaction. Variations in the boride phases are discussed in terms of nucleation- and growth-controlled phase selection mechanisms. These selection processes also influenced the nature and proportion of the Ni-B-Si eutectics by changing the amount of the boron available for the final eutectic reactions. The results of this work emphasize the importance of controlling the cooling rate during deposition of these industrially important alloys using laser beam or other rapid solidification techniques.
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Acknowledgments
This research was carried out under project number MC7.06259 in the framework of the Research Program of the Materials innovation institute M2i (www.m2i.nl). The Wall Colmonoy Ltd. (The U.K.) is acknowledged for providing Colmonoy 69 powder.
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Hemmati, I., Ocelík, V., Csach, K. et al. Microstructure and Phase Formation in a Rapidly Solidified Laser-Deposited Ni-Cr-B-Si-C Hardfacing Alloy. Metall Mater Trans A 45, 878–892 (2014). https://doi.org/10.1007/s11661-013-2004-4
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DOI: https://doi.org/10.1007/s11661-013-2004-4