Abstract
This study examined the impact of current solution treatment on the microstructure and mechanical properties of the Co-28Cr-6Mo-0.22C alloy investment castings. The findings reveal that the current solution treatment significantly promotes the dissolution of carbides at a lower temperature. The optimal conditions for solution treatment are determined as a solution temperature of 1,125 °C and a holding time of 5.0 min. Under these parameters, the size and volume fraction of precipitated phases in the investment castings are measured as 6.2 µm and 1.1vol.%. The yield strength, ultimate tensile strength, and total elongation of the Co-28Cr-6Mo-0.22C investment castings are 535 MPa, 760 MPa, and 12.6%, respectively. These values exceed those obtained with the conventional solution treatment at 1,200 °C for 4.0 h. The findings suggest a phase transformation of M23C6→σ+C following the current solution treatment at 1,125 °C for 5.0 min. In comparison, the traditional solution treatment at 1,200 °C for 4.0 h leads to the formation of M23C6 and M6C carbides. It is noteworthy that the non-thermal effect of the current during the solution treatment modifies the free energy of both the matrix and precipitation phase. This modification lowers the phase transition temperature of the M23C6→σ+C reaction, thereby facilitating the dissolution of carbides. As a result, the current solution treatment approach achieves carbide dissolution at a lower temperature and within a significantly shorter time when compared to the traditional solution treatment methods.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (Nos. 52271034, 51974183, and 51974184), Science and Technology Major Project of Yunnan Province (No. 202302AB080020), and Natural Science Foundation of Shanghai (No. 22ZR1425000).
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Chang-jiang Song
Ph. D., Professor. His research interests mainly focus on solidification theory and microstructure control, and fabrication of super performance metastable engineering materials through solidification process control. He has supervised over 30 projects and published more than 130 papers in academic journals.
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Dan, Zy., Liu, J., Zhang, Jl. et al. Microstructure and mechanical properties of Co-28Cr-6Mo-0.22C investment castings by current solution treatment. China Foundry (2024). https://doi.org/10.1007/s41230-024-3158-y
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DOI: https://doi.org/10.1007/s41230-024-3158-y