Quantitative analysis of precipitation and strengthening mechanisms of V and V-Ti hot-rolled microalloyed steels

In the present work, hot-rolled V and V- Ti microalloyed steels are comparatively investigated by multi-scale characterizations and electrolytically extracted phase analysis, aiming at quantitatively revealing the influence of microalloying elements on microstructure, precipitation behavior and mech...

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Bibliographic Details
Published in:Journal of materials science 2022-02, Vol.57 (7), p.4806-4819
Main Authors: Zhu, Zimeng, Yu, Hao, Wang, Kun, Tian, Yu, Gao, Jinyao
Format: Article
Language:English
Subjects:
Analysis
Banded structure
Carbon nitride
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Empirical analysis
Ferrite
Grain size
Heat treating
High strength low alloy steels
Hot rolling
Hot-rolled steel
Iron compounds
Materials Science
Mechanical properties
Metals & Corrosion
Microalloying
Polymer Sciences
Precipitates
Precipitation hardening
Quantitative analysis
Solid Mechanics
Strengthening
Substitutes
Tensile tests
Titanium
Vanadium
Yield strength
Yield stress
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Summary:In the present work, hot-rolled V and V- Ti microalloyed steels are comparatively investigated by multi-scale characterizations and electrolytically extracted phase analysis, aiming at quantitatively revealing the influence of microalloying elements on microstructure, precipitation behavior and mechanical properties. The results demonstrate that the substitution of trace Ti slightly refines and homogenizes the ferrite grain size (10.8 → 12.8 μm), but aggravates the banded structure and decreases the precipitation ratio of V (39 → 30%). Simultaneously, Ti induces the compound precipitation of V -Ti carbonitrides, which reduces the amount of V in austenite, resulting in substantially reduced precipitation strengthening due to the smaller volume fraction (0.0058 → 0.0027%), the larger particle size (34.1 → 65.8 nm) and inter-particle spacing (74 → 127 nm) of fine nano-precipitates in ferrite. The yield strength predicted by semi-empirical models agrees well with the results of tensile testing, which indicates that microcrystalline Ti substitution for V reduces the yield strength of traditional hot-rolled steel.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-022-06876-8