Austenite Grain Growth Behavior of Vanadium Microalloying Medium Manganese Martensitic Wear-Resistant Steel
HAN Ruyang1, YANG Gengwei1(), SUN Xinjun2, ZHAO Gang1, LIANG Xiaokai2, ZHU Xiaoxiang1
1.State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China 2.Department of Structrual Steels, Central Iron and Steel Research Institute, Beijing 100053, China
Cite this article:
HAN Ruyang, YANG Gengwei, SUN Xinjun, ZHAO Gang, LIANG Xiaokai, ZHU Xiaoxiang. Austenite Grain Growth Behavior of Vanadium Microalloying Medium Manganese Martensitic Wear-Resistant Steel. Acta Metall Sin, 2022, 58(12): 1589-1599.
Medium manganese martensitic wear-resistant steel is a new type of wear-resistant steel with high hardenability and hardness; moreover, the controlling austenite grain size is of great significance for improving its comprehensive properties. In this study, the austenite growth behavior of vanadium microalloying medium manganese martensitic wear-resistant steel was systematically investigated using the Gleeble-3500 thermal simulation testing machine, OM, and HRTEM. The morphology, size, and particle size distribution of the second phase particles at different heating temperatures and holding times were analyzed. The influence of second phase particles on the growth behavior in austenite was also revealed. The results showed that the ultra-fine austenite grains with grain size of 3.98 μm were obtained when the sample was held at 820oC for 10 s. After holding for 3600 s, the average grain size of austenite only increased by 1.47 μm, and the austenite grains showed a strong ability to resist coarsening at 820oC. This could be attributed to the fine V(C, N) particles which could pin the austenite grain boundary and inhibit the growth of austenite grains. Furthermore, when reheating temperatures and holding times increase, the dissolution and coarsening of V(C, N) particles lead to the decrease of pining ability and then to the rapid growth of austenite. A new Sellars model with a time index was used to establish austenite growth model using a new method with a predetermined error function. The accuracy of the prediction for austenite grain sizes with new Sellars model was greatly improved compared with the traditional Beck model.
Fig.1 Schematic of rolling and heat treatment process of sample (Ac3—austenite formation finish temperature )
Fig.2 OM images of samples after heating at different temperatures holding for 3600 s (a) 820oC (b) 850oC (c) 880oC (d) 900oC (e) 950oC (f) 1000oC
Fig.3 Variation of the average grain size of austenite with heating temperature
Fig.4 OM images of samples at 820oC (a-c) and 950oC (d-f) with different holding time (a, d) 10 s (b, e) 600 s (c, f) 1800 s
Fig.5 Variations of the average grain size of austenite in samples with holding time at different heating temperatures
Fig.6 TEM images and EDS analysis (inset) of second phase particles of samples at different heating temperatures for 600 s (a) 820oC (b) 850oC (c) 900oC (d) 950oC
Fig.7 Low (a, d) and high (b, e) magnified HRTEM images, and corresponding fast Fourier transformation (FFT) diffractograms (c, f) of the spherical (a-c) and short claviform (d-f) second phase particles (d(hkl)—interplanar spacing of (hkl), a—lattice parameter)
Fig.8 HRTEM images of second phase particles of samples at different heating temperatures for 1800 s (a-d) and 3600 s (e-h) (a, e) 820oC (b, f) 850oC (c, g) 900oC (d, h) 950oC
Fig.9 Variations of the average size of V(C, N) with heating temperatures in the samples
Fig.10 Particle numbers in each square micron and grain diameter distributions of second phase particles at different temperatures for 600 s, 1800 s, and 3600 s (a) 820oC (b) 850oC (c) 900oC (d) 950oC
Time / s
820oC
850oC
900oC
950oC
600
0.315 ± 0.025
0.231 ± 0.032
0.126 ± 0.036
0.049 ± 0.013
1800
0.273 ± 0.037
0.211 ± 0.033
0.086 ± 0.029
0.037 ± 0.012
3600
0.265 ± 0.043
0.169 ± 0.038
0.046 ± 0.021
0.023 ± 0.006
Table 1 Volume fractions of second phase particles of samples after holding at different heating temperatures for 600 s, 1800 s, and 3600 s
Fig.11 Relationships between pinging pressure and different temperatures
Fig.12 Relationships between errow function (Serror(n)) and growth index (n) at different temperature stages (a) 820-880oC (b) 900-1000oC
Fig.13 Relationship of ln(D - D) with lnt linearly fitted (a, b) and 1 / T linearly fitted (c, d) at various heating temperature ranges (Dt —average grain size, D0—initial grain size, t—holding time, T—heating temperature) (a, c) 820-880oC (b, d) 900-1000oC
Fig.14 Comparisons between predicted and measured grain sizes for different austenite growth models(a) modified Sellars model (b) Beck model
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