Abstract
A low-carbon steel micro-alloyed with Nb, V and Ti was subjected to partial austenitized followed by two-step quenching and partitioning (Q&P) process. Combined use of static dilatometer, SEM and EPMA techniques revealed the microstructure evolution and elements variation during partitioning process. The result shows that the retained austenite normally located inside or around M/A the island with blocky morphology as well as obvious carbon enrichment. With increasing partitioning time, the carbon enrichment region expanded and the carbides precipitated inside the tempered martensite. The rate of Bainite transformation dilatation during partitioning process accelerated with increasing partitioning time, whereas carbide precipitation during martensite temper lead to a compression at the same time.
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References
J.G. Speer, D.K. Matlock, B.C.D. Cooman, J.G. Schroth, Carbon partitioning into austenite after martensite transformation. Acta Mater. 51, 2611–2622 (2003)
D.V. Edmonds, K. He, F.C. Rizzo, B.C. De Cooman, D.K. Matlock, J.G. Speer, Quenching and partitioning martensite—a novel steel heat treatment. Mater. Sci. Eng. A 438–440, 25–34 (2006)
A.J. Clarke, J.G. Speer, M.K. Miller, R.E. Hackenberg, D.V. Edmonds, D.K. Matlock, F.C. Rizzo, K.D. Clarke, E. De Moor, Carbon partitioning to austenite from martensite or bainite during the quench and partition (Q&P) process: a critical assessment. Acta Mater. 56, 16–22 (2008)
A.J. Clarke, J.G. Speer, D.K. Matlock, F.C. Rizzo, D.V. Edmonds, M.J. Santofimia, Influence of carbon partitioning kinetics on final austenite fraction during quenching and partitioning. Scripta Mater. 61, 149–152 (2009)
Y. Toji, G. Miyamoto, D. Raabe, Carbon partitioning during quenching and partitioning heat treatment accompanied by carbide precipitation. Acta Mater. 86, 137–147 (2015)
F. Hajyakbary, J. Sietsma, G. Miyamoto, T. Furuhara, M.J. Santofimia, Interaction of carbon partitioning, carbide precipitation and bainite formation during the Q&P process in a low C steel. Acta Mater. 104, 72–83 (2016)
H.K.D.H. Bhadeshia, D.V. Edmonds, The bainite transformation in a silicon steel. Metall. Mater. Trans. A. 10, 895–907 (1979)
X. Tan, Y. Xu, X. Yang, D. Wu, Microstructure—properties relationship in a one-step quenched and partitioned steel. Mater. Sci. Eng. A 589, 101–111 (2014)
K.O. Findley, J. Hidalgo, R.M. Huizenga, M.J. Santofimia, Controlling the work hardening of martensite to increase the strength/ductility balance in quenched and partitioned steels. Mater. Des. 117, 248–256 (2017)
H.Y. Li, X.W. Lu, W.J. Li, X.J. Jin, Microstructure and mechanical properties of an ultrahigh-strength 40SiMnNiCr steel during the one-step quenching and partitioning process. Metall. Mater. Trans. A 41, 1284–1300 (2014)
J.G. Speer, D.V. Edmonds, F.C. Rizzo, D.K. Matlock, Partitioning of carbon from supersaturated plates of ferrite, with application to steel processing and fundamentals of the bainite transformation. Curr. Opin. Solid State Mater. Sci. 8, 219–237 (2004)
Acknowledgements
The authors acknowledge support by the National Natural Science Foundation of China (Nos. 51674080, 51404155 and U1260204), the Program for New Century Excellent Talents in University (NCET-13-0111) and the Program for Liaoning Excellent Talents in University (LR2014007).
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Peng, F., Xu, Y., Gu, X., Wang, Y., Liu, X., Yu, Y. (2018). Transformation Behavior During Isothermal Partitioning Process in Micro-alloyed Q&P Steel. In: Han, Y. (eds) Advances in Materials Processing. CMC 2017. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-13-0107-0_40
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DOI: https://doi.org/10.1007/978-981-13-0107-0_40
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