Effect of V Addition on Microstructure and Mechanical Properties in C–Mn–Si Steels after Quenching and Partitioning Processes

Three C-Si-Mn Q&P steels with different V addition after one-step and two-step quenching and partitioning (Q&P) processes were investigated by means of optical microstructure observation, X-ray diffraction (XRD) measurement, transmission electron microscopy (TEM) characterization and particl...

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Bibliographic Details
Published in:Metals (Basel ) 2021-08, Vol.11 (8), p.1306
Main Authors: Zhang, Gong-Ting, Zhu, Na-Qiong, Sun, Bo-Wei, Zhao, Zheng-Zhi, Zheng, Zhi-Wang, Tang, Di, Li, Lin
Format: Article
Language:English
Subjects:
Carbon
Ductility
Grain refinement
Hardening rate
High strength steels
Hot rolling
Interrupted quenching
Mechanical properties
Microstructure
Particle size distribution
Partitioning
Plastic properties
precipitate size distribution
Precipitation hardening
Retained austenite
Steel
Strengthening
Temperature
Tempered martensite
V microalloyed Q&P steel
Vanadium carbide
Work hardening
work hardening rate
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Summary:Three C-Si-Mn Q&P steels with different V addition after one-step and two-step quenching and partitioning (Q&P) processes were investigated by means of optical microstructure observation, X-ray diffraction (XRD) measurement, transmission electron microscopy (TEM) characterization and particle size distribution (PSD) analysis. The effect of V addition on strength and ductility of the steels was elucidated by comparative analysis on the microstructure and mechanical properties as functions of partitioning time and temperature. For one-step Q&P treatment, the mechanical properties were mainly controlled by the tempering behavior of martensite during partitioning. V addition was helpful to mitigate the deterioration of mechanical properties by precipitation strengthening and grain refinement strengthening. For two-step Q&P treatment, the satisfying plasticity was attributed to the transformation-induced plasticity (TRIP) effect of retained austenite maintaining the high work hardening rate at high strain regime. The higher volume fraction of retained austenite with high stability resulted from the refined microstructure and the promoted carbon partitioning for the steel with 0.16 wt% V addition. However, the carbon consumption due to the formation of VC carbides led to the strength reduction of tempered martensite.
ISSN:2075-4701
2075-4701
DOI:10.3390/met11081306