4.7 Article

Revealing carbide precipitation effects and their mechanisms during quenching-partitioning-tempering of a high carbon steel: Experiments and Modeling

期刊

ACTA MATERIALIA
卷 217, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2021.117176

关键词

High carbon steel; Quenching-partitioning-tempering; Carbide precipitation; Interface migration; Thermo-kinetic model

资金

  1. National Natural Science Foundation of China [U1808208]
  2. National Key R&D Program of China [2017YFA0204403]
  3. Shenzhen-Hong Kong Science and Technology Innovation Cooperation Zone Shenzhen Park Project [HZQB-KCZYB2020030]

向作者/读者索取更多资源

Quenching Partitioning Tempering (Q-P-T) is a promising process for treating ultra-high strength steels, achieving a good balance of strength and ductility by stabilizing metastable austenite and strengthening the martensite matrix. Competitive reactions during partitioning/tempering play a substantial role in the microstructures of Q-P-T steels.
Quenching Partitioning Tempering (Q-P-T), as a modified process of quenching and partitioning (Q&P), is a promising process to treat ultra-high strength steels with a good balance of strength and ductility. The essences of the Q-P-T process are to stabilize metastable austenite via carbon partitioning from martensite into austenite during partitioning and to strengthen the martensite matrix via nano-precipitation of micro-alloyed carbides during tempering. The competitive reactions, e.g. carbon segregation to dislocations, transition carbide precipitation and austenite decomposition, could occur during partitioning/tempering, which are expected to play a substantial role in the microstructures of the Q-P-T steels. In this contribution, the complex microstructure evolution during the Q-P-T processing of an Fe-0.67C-1.48Mn-1.53Si-0.038Nb steel was systematically characterized by various techniques. A concise QPT-LE (Local Equilibrium) thermo-kinetic model with dual interfaces (martensite/carbide and martensite/austenite) migration was established to predict the evolution of austenite fraction and its carbon content based on the consideration of competitive reactions mentioned above. In the QPT-LE model the effect of carbide precipitation is introduced, which is different from CCE (constrained carbon equilibrium) thermodynamic model and QP-LE thermo-kinetic model. Therefore, the QPT-LE model can be used to reveal the effects of carbide precipitation on the retained austenite fraction and its carbon content, while the prediction accuracy of carbide fraction can be further improved by considering the effect of carbon segregation to dislocation. In general, the QPT-LE model can better predict the experimental results compared with popular CCE model and QP-LE model. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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