Abstract
In this study, a significant hardening effect was obtained in a low-carbon steel containing Ti and W by performing a 20 pct hot compressive deformation and 60 seconds stress relaxation at 1148 K to 1198 K (875 °C to 925 °C) in the austenite region. TEM observation indicated that the hardening effect in martensite and bainite was closely associated with a fine dispersion of ultrafine precipitates with particle size of 1 to 10 nm at peak hardness. These ultrafine precipitates were identified as W, Fe-rich (WFeTi)C carbides with MC-type B1 structure, the crystal parameter of which is quite similar to austenite matrix. The precipitation mechanism of these ultrafine particles is discussed and the strength increment from precipitation hardening is estimated by applying a structure-based strength model and microstructure characterization.
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Acknowledgments
The authors appreciate the financial support by the Fund of Key Laboratory of Advanced Materials of Ministry of Education (No. XJCL201906), the Heilongjiang Natural Science Foundation (Nos. QC2018051 and LH2019E028), the Heilongjiang Postdoctoral Fund of China (No. LBH-Z16046), the China Postdoctoral Science Foundation (2017T100227 and 2019M651259), the Fundamental Research funds for the Central Universities (Nos. 3072019CF1012 and 3072019CFJ1002), and China Scholarship Council (CSC) Scholarship and Natural Sciences Foundation of China (Grant Nos. 51671065 and 51471094).
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Manuscript submitted November 25, 2019.
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Wang, Z., Wang, J., Dong, H. et al. Hardening Through an Ultrafine Carbide Precipitation in Austenite of a Low-Carbon Steel Containing Titanium and Tungsten. Metall Mater Trans A 51, 3778–3788 (2020). https://doi.org/10.1007/s11661-020-05807-z
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DOI: https://doi.org/10.1007/s11661-020-05807-z