1 Beijing Key Laboratory of Green Recyclable Process for Iron & steel Production Technology, Research Institute of Technology, Shougang Group Co. Ltd., Beijing 100043, China; 2 Shougang Jingtang Steel Company, Tangshan 063200, China
Cite this article:
Xiaolin LI, Yang CUI, Baoliang XIAO, Dawei ZHANG, Zhao JIN, Zheng CHENG. Effects of On-Line Rapid Induction Tempering on Pricipitation Strengthening Mechanism of V(C, N) in V-N Microalloyed Steel. Acta Metall Sin, 2018, 54(10): 1368-1376.
The low carbon bainite steel with high strength, excellent toughness and plasticity was widely used for pipeline, engineering machinery, ocean station vessel and other fields. The light weight of structure of construction machines puts forward higher requirements for performance of steel, which promotes the development and application of low carbon microalloyed steel. A low carbon bainite steel combined with V-N microalloyed was designed for engineering machinery, to upgrade performance by microstructure control and the refinement and dispersion control of precipitates. This steel was tempered on-line with rapid heating rate after controlled rolling and accelerated cooling process. Effects of different holding time under rapid induction tempering on precipitation strengthening mechanism and mechanical property of V-N microalloyed steel were investigated by using three dimensional atom probe (3DAP), SEM and TEM. The results showed that the main microstructures of tested steel are granular bainite before tempering, and granular bainite and ferrite appears after tempering at 600 ℃. The hardness and yield strength values reached its peak at 600 ℃ tempered for 300 s, which were 330.45 HV and 815 MPa, respectively. Compared with untempered sample, the measured strengthening increment in yield strength was 173 MPa which was due to the V-rich or VN-rich clusters with 20~100 atoms distributing similar to monoatomic layer and resembled the GP zones. These small nanoclusters have strong interaction with dislocation, and compared with V(C, N) particles, V or VN clusters have better strengthening effect.
Fig.2 Effects of holding time on the hardness and yield strength of the samples with rapid induction tempered at 600 ℃
Fig.3 SEM images of samples rapid induction tempered at 600 ℃ with different holding time (GB—granular bainite, F—ferrite, M/A—martensite/austenite) (a) untempered (b) 50 s (c) 100 s (d) 300 s (e) 600 s (f) 1800 s
Fig.4 TEM images of precipitates in V-N microalloyed steel rapid induction tempered at 600 ℃ with different holding time (Arrows show precipitated phases) (a) 50 s (b) 300 s (c) 600 s (d) 1800 s
Fig.5 Extraction-replica HRTEM image of the fine carbides in tested steel tempered at 600 ℃ for 300 s (a), corresponding EDS analysis of fine carbides (b), the HRTEM image of single V(C, N) precipitate (c) and inverse Fourier transforms lattice image of precipitate (d)
Fig.6 3DAP images of tested steels with rapid induction tempered at 600 ℃ for 300 s (a) C (b) Cr (c) Mo (d) V (e) a VN cluster (f) the cluster of corresponding 1%V (atomic fraction) iso-concentration surface
Fig.7 3DAP images of C, V and VN in cluster of samples rapid induction tempered at 600 ℃ for 300 s (a) and 600 s (b)
Fig.8 Solute concentration of the clusters and particles as a function of the radius in the tested steels rapid induction tempered at 600 ℃ for 300 s
Fig.9 The number of partitioned V atom distribution and the number density of clusters versus cluster size of samples rapid induction tempered at 600 ℃ for 300 and 600 s
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