Abstract
To achieve the brazed diamond tools with low thermal damage, the diamonds were brazed using Ni–Cr base filler metals containing up to 1.5 weight percent Nd. The microstructure of Ni–Cr base filler metals and the surface morphology and interfacial microstructure of brazed samples were characterized. The results show that by the addition of Nd, the microstructure of filler metals is obviously refined and becomes uniform. Meanwhile, Nd doping effectively reduces the graphitization degree and thermal residual stress of brazed diamonds. In addition, a variety of carbides (such as Cr3C2, Cr7C3, and SiC) which have low hot cracking tendencies are formed through occurring chemical/metallurgical reactions. The microstructural NdNi4B particles contribute to reducing the thermal damage of the brazed diamonds after brazing. At a doping level of 1.0 wt.% of rare-earth Nd, the maximum residual stress of brazed diamond was reduced by 20% and the material removal increased by 45.1%.
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Funding
This work was financially supported by the National Natural Science Foundation of China (Grant No. 52271017), Key Research and Development Plan Program of Anhui Province (No. 2022i01020008), Key Research and Development and Achievement Transformation Project of Science and Technology Projects in Wuhu City (2023yf032), and Scientific Research Starting Foundation of Anhui Polytechnic University (2022YQQ038) .
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Wang, B., Wang, P., Liu, C. et al. Effect of Nd element on the microstructure and mechanical performance of brazed diamonds with Ni–Cr filler metal. Weld World (2024). https://doi.org/10.1007/s40194-024-01725-5
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DOI: https://doi.org/10.1007/s40194-024-01725-5