The Influence of Temperature on the Microstructure and Properties of Nb-V-Ti-Mo Complex Microalloyed High-Strength Fire-Resistant Steel
Abstract
:1. Introduction
2. Experimental Materials and Methods
3. Results
3.1. Tensile Properties at Different Temperatures
3.2. Microstructures
3.3. Nanoprecipitation
4. Discussion
4.1. Tensile Properties at Different Temperatures
4.2. Work Hardening Behavior
4.3. Comparison with Mild Steels
5. Conclusions
- The yield strength of experimental steel is 617 MPa and the tensile strength is 813 MPa. As the experimental temperature increases, the high-temperature yield strength gradually decreases to 239 MPa at 700 °C. The effective grain size does not increase significantly at different temperatures and slightly fluctuates within the range of 12.5–13.6 μm. The matrix micromorphology does not change significantly, and recrystallized grains begin to appear at the grain boundaries at 600 °C.
- A small number of nanoprecipitates are distributed in the as-rolled specimen, with an average diameter of 29.2 nm. Upon increasing the temperature, the number of fine nanoprecipitates gradually increases, especially those less than 10 nm, which gradually decreases the average diameter, reaching 19.4 nm at 600 °C. The calculated precipitation strengthening value is consistent with the experimental precipitation strengthening value, and the Orowan equation explains well the precipitation strengthening effect of nanoprecipitates formed at elevated temperatures.
- The work hardening rate decreases significantly with the temperature, and necking is more likely to occur. At room temperature and 300 °C, the Ashby work hardening theoretical curves are consistent with the experimental true stress-strain curves.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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C | Si | Mn + C r + Ni + Cu | P | S | Mo | Ti | Nb | V | N |
---|---|---|---|---|---|---|---|---|---|
0.056 | 0.32 | ≤2.5 | 0.007 | 0.004 | 0.21 | 0.014 | 0.093 | 0.03 | 0.0035 |
State | Mass Fraction in Alloy of Elements in M(C, N) Phase (%) | M(C, N) Phase Composition | ||||||
---|---|---|---|---|---|---|---|---|
Nb | Ti | V | Mo | N | C * | Σ | ||
As-rolled | 0.021 | 0.011 | 0.0022 | 0.0080 | 0.0030 | 0.0044 | 0.050 | (Nb0.388Ti0.395V0.074Mo0.143) (C0.632N0.368) |
300 °C | 0.018 | 0.013 | 0.0011 | 0.0050 | 0.0025 | 0.0041 | 0.043 | (Nb0.362Ti0.512V0.037Mo0.088) (C0.655N0.345) |
600 °C | 0.055 | 0.013 | 0.0074 | 0.027 | 0.0032 | 0.013 | 0.119 | (Nb0.459Ti0.211V0.112Mo0.218) (C0.823N0.177) |
State | Mass Fraction in Alloy of Elements in M3C Phase(%) | M3C Phase Composition | |||||
---|---|---|---|---|---|---|---|
Fe | Cr | Mn | Mo | C * | Σ | ||
As-rolled | 0.084 | 0.0089 | 0.0039 | 0.003 | 0.0071 | 0.107 | (Fe0.846Cr0.096Mn0.040Mo0.017)3C |
300 °C | 0.128 | 0.0050 | 0.0040 | 0.002 | 0.010 | 0.147 | (Fe0.931Cr0.039Mn0.030Mo0.005)3C |
600 °C | 0.537 | 0.034 | 0.0096 | 0.010 | 0.042 | 0.633 | (Fe0.912Cr0.062Mn0.016Mo0.010)3C |
Experimental temperature (°C) | YS (MPa) | YS0 (MPa) | YSs (MPa) | YSg (MPa) | YSd (MPa) | YSp (MPa) |
---|---|---|---|---|---|---|
As-rolled | 617 | 57.0 | 246.2 | 153.8 | 110.8 | 49.2 |
300 °C | 609 | 55.4 | 230.8 | 164.2 | 106.5 | 52.1 |
600 °C | 424 | 44.3 | 45 | 138.8 | 75.0 | 120.9 |
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Wang, X.; Li, Z.; Zhou, S.; Chen, R.; Da, G.; Yong, Q.; Yang, Z.; Shen, J.; Shang, C.; Liu, Q. The Influence of Temperature on the Microstructure and Properties of Nb-V-Ti-Mo Complex Microalloyed High-Strength Fire-Resistant Steel. Metals 2021, 11, 1670. https://doi.org/10.3390/met11111670
Wang X, Li Z, Zhou S, Chen R, Da G, Yong Q, Yang Z, Shen J, Shang C, Liu Q. The Influence of Temperature on the Microstructure and Properties of Nb-V-Ti-Mo Complex Microalloyed High-Strength Fire-Resistant Steel. Metals. 2021; 11(11):1670. https://doi.org/10.3390/met11111670
Chicago/Turabian StyleWang, Xin, Zhaodong Li, Shitong Zhou, Runnong Chen, Guangjie Da, Qilong Yong, Zhongmin Yang, Junchang Shen, Chengjia Shang, and Qingyou Liu. 2021. "The Influence of Temperature on the Microstructure and Properties of Nb-V-Ti-Mo Complex Microalloyed High-Strength Fire-Resistant Steel" Metals 11, no. 11: 1670. https://doi.org/10.3390/met11111670