高强钢筋中V、Ti碳氮化物的析出行为及规律

doi:10.13251/j.issn.0254-6051.2025.12.040

摘要/Abstract

摘要： 采用 JMatPro 软件和时效硬度法研究了0.022Ti(1号)、0.035V(2号)、0.013Ti+0.014V(3号)钢筋中碳氮化物的沉淀析出行为,并分析了不同时效温度(700和750 ℃)下Ti、V的碳氮化物的析出规律。结果表明,随着时效温度的升高,钢中碳氮化物的析出起始时间缩短,析出所需的孕育期减少,析出速率加快。具体而言,1号、2号和3号试验钢在750 ℃时的析出开始时间分别为30、70和30 s,而在700 ℃时分别为500、200和100 s。在较高时效温度下,钛的碳氮化物更易于析出;在较低时效温度下,钒的碳氮化物更易析出。随着时效温度的升高,钢中碳氮化物质量分数逐渐降低,析出动力学显著加快。在本试验钢成分下,时效硬度法得到的碳氮化物在铁素体中析出的动力学曲线显示,析出开始时间随温度升高而单调减小。

关键词: 碳化物, 氮化物, 析出, 硬度, 钢筋

Abstract: Precipitation behavior of carbonitrides particles in three types of steel bars—0.022Ti (No.1), 0.035V (No.2), and 0.013Ti+0.014V (No.3) was investigated using JMatPro software and the aging-hardness method. The precipitation patterns of Ti and V carbonitrides at different aging temperatures (700 ℃ and 750 ℃) were analyzed. The results indicate that increasing the aging temperature shortens the onset time of carbonitride precipitation, reduces the incubation period, and accelerates the precipitation rate. Specifically, the onset time of precipitation at 750 ℃ for specimens 1, 2, and 3 is 30, 70, and 30 s, respectively, whereas at 700 ℃, they are 500, 200 and 100 s respectively. Titanium carbonitrides tend to precipitate more readily at higher aging temperatures, whereas vanadium carbonitrides are more likely to form at lower temperatures. As the aging temperature increases, the mass fraction of carbonitrides particles in steel gradually decreases, and the precipitation kinetics are significantly enhanced. Under the tested steel composition conditions, the kinetic curves for the nucleation and precipitation of carbonitrides particles in ferrite, derived from the aging-hardness method, demonstrate that the precipitation start time decreases monotonically with rising temperature.

Key words: carbides, nitrides, precipitation, hardness, steel bars

中图分类号:

TG156.5

迟云广. 高强钢筋中V、Ti碳氮化物的析出行为及规律[J]. 金属热处理, 2025, 50(12): 260-265.

Chi Yunguang. Precipitation behavior and law of Ti and V carbonitrides in high-strength steel bars[J]. Heat Treatment of Metals, 2025, 50(12): 260-265.

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