Thermodynamic calculation and experimental analysis on precipitation behavior of V(C, N) in vanadium microalloyed steels

doi:10.13251/j.issn.0254-6051.2025.04.015

Abstract

Abstract: Precipitation behavior of V(C, N) in V-microalloyed steels was studied by calculation using FactSage thermodynamic software, and experiments on the tested steels with and without addition of 0.05%V by scanning electron microscope and microhardness tester. The calculation results indicate that the precipitation amount of V(C, N) phase increases gradually with the increase of V content, while when the V content exceeds 0.02%, the initial precipitation temperature of V(C, N) phase does not increase significantly. After quenching at 950 ℃ and tempering at 550 ℃, the measured precipitation amount of V(C, N) phase in the tested 0.05%V microalloyed steel is the largest, and the hardness reaches the maximum. With the decrease of simulated coiling temperature, the hardness of 0.05%V steel increases firstly, then decreases and finally increases, the hard phase martensite structure increases, but the precipitation amount of V(C, N) phase increases firstly and then decreases, and reaches the maximum at 400 ℃, indicating that the hardness of the tested steel is influenced by both the microstructure characteristics and precipitated phases.

Key words: V-microalloyed steels, V content, V(C, N) phase, hardness

CLC Number:

TG161

Sun Xiqing, Liu Quanbin, Li Qiukui, Yang Bo, Li Chuncheng. Thermodynamic calculation and experimental analysis on precipitation behavior of V(C, N) in vanadium microalloyed steels[J]. Heat Treatment of Metals, 2025, 50(4): 101-105.

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