Abstract
The microstructure evolution of high nitrogen austenitic steel wires under various annealing times and drawing temperatures was carefully characterized. Special attention was paid to the widely distributed twins and the nanoprecipitates at twin boundaries (TBs) in high nitrogen stainless steels (HNSSs). The results of microhardness indicated that the traditional Hall–Petch (H–P) equation, which only took the role of grain boundaries into account, was unsuitable. A new H–P equation that connected grain size, twin density, precipitates at TBs, and microhardness in HNSS was established for the first time and showed to be in good agreement with the experimental results. By analyzing the strained regions near TBs, a model describing the precipitation of nano-M23C6 carbides on coherent twin boundaries and incoherent twin boundaries was proposed. In addition, the influence mechanism of the nano-M23C6 at TBs on microhardness was discussed.
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ACKNOWLEDGMENTS
The authors wish to acknowledge the financial support from Project of Science and Technology Plan of Hebei Province (No. 15211007D). The authors are also appreciative of the facilities and assistance provided by the Electron Microscope Unit at the HBIS research institute.
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Ren, S., Sun, Z., Xu, Z. et al. Effects of twins and precipitates at twin boundaries on Hall–Petch relation in high nitrogen stainless steel. Journal of Materials Research 33, 1764–1772 (2018). https://doi.org/10.1557/jmr.2018.138
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DOI: https://doi.org/10.1557/jmr.2018.138