Abstract
17-4 precipitation hardenable (PH) stainless steel is a commonly used alloy for a wide range of industrial applications, making it a valuable addition to the additive manufacturing (AM) sphere. In order to confidently use 17-4PH as an AM feedstock, its behavior must be understood under the wide range of thermal conditions and rapid solidification rates characteristic of AM processes. There have been many studies on the microstructure and properties of 17-4PH in laser powder bed applications, but most focus only on final heat-treated microstructure with little attention paid to the as-built microstructure [1–4]. There is very little published research on the microstructure of 17-4PH using plasma-based additive manufacturing methods. Clearly, a large gap still exists in the understanding of 17-4PH that must be addressed before AM parts built with 17-4PH can be used. This work begins to address this gap by observing the relationship between the microstructure, the thermal gradient, and the velocity of the solidification front to build the foundation for a process–structure–property relationship for this alloy.
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Acknowledgments
The authors would like to acknowledge Syncrude, NSERC, and HI-AM without whose support this work would not have been possible.
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McDonald, A. et al. (2023). Microstructure Map of Rapidly Solidified 17-4PH Stainless Steel. In: Proceedings of the 62nd Conference of Metallurgists, COM 2023. COM 2023. Springer, Cham. https://doi.org/10.1007/978-3-031-38141-6_67
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DOI: https://doi.org/10.1007/978-3-031-38141-6_67
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