终冷温度对高强度抗震钢筋组织和性能的影响

doi:10.11901/1005.3093.2021.010

材料研究学报

2021, Vol. 35

Issue (11): 857-865 DOI: 10.11901/1005.3093.2021.010

研究论文

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终冷温度对高强度抗震钢筋组织和性能的影响

曾泽芸¹, 李长荣¹^,²(

), 黎志英¹^,², 黄胜¹, 黎世旺¹, 尤景田¹

^1.贵州大学材料与冶金学院贵阳 550025
^2.贵州省冶金工程与过程节能重点实验室贵阳 550025

Effect of Final Temperature of Cooling on Microstructure and Properties of Aseismic High-strength Steel Rebar

ZENG Zeyun¹, LI Changrong¹^,²(

), LI Zhiying¹^,², HUANG Sheng¹, LI Shiwang¹, YOU Jingtian¹

^1.School of Materials and Metallurgy, Guizhou University, Guiyang 550025, China
^2.Key Laboratory of Metallurgical Engineering and Process Energy Conservation of Guizhou Province, Guiyang 550025, China

引用本文:

曾泽芸, 李长荣, 黎志英, 黄胜, 黎世旺, 尤景田. 终冷温度对高强度抗震钢筋组织和性能的影响[J]. 材料研究学报, 2021, 35(11): 857-865.
Zeyun ZENG, Changrong LI, Zhiying LI, Sheng HUANG, Shiwang LI, Jingtian YOU. Effect of Final Temperature of Cooling on Microstructure and Properties of Aseismic High-strength Steel Rebar[J]. Chinese Journal of Materials Research, 2021, 35(11): 857-865.

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摘要:

用Gleeble-3800热模拟机进行高强度抗震钢筋的热模拟实验，使用金相显微镜(OM)、场发射扫描电子显微镜(SEM)、高分辨透射电子显微镜(TEM)和万能拉伸试验机等手段表征其微观结构、第二相、力学性能和断口形貌，研究了终冷温度对高强度抗震钢筋的组织和性能的影响并揭示微合金元素细化晶粒的机理。结果表明：实验钢的显微组织主要为铁素体和珠光体，随着终冷温度的降低铁素体晶粒细化。终冷温度为650℃时实验钢中分布在铁素体基体上的主要析出相 (Nb, Ti, V)C和(V, Nb, Ti)C的平均粒径约为2 nm和5 nm。随着终冷温度的降低实验钢的抗拉强度和屈服强度都增加，终冷温度为650℃时其抗拉强度和屈服强度分别为638.75 MPa和467 MPa，强屈比为1.37。在不同终冷温度实验钢的拉伸断口主要为等轴韧窝，其尺寸和深度不同。

关键词 ：金属材料, 高强度抗震钢筋, 终冷温度, 微观结构, 力学性能

Abstract：

The thermal simulation test of an experimental aseismic high strength steel was conducted by Gleeble-3800 thermal simulator, then its microstructure, second phase, mechanical properties and fracture morphology were characterized by metallographic microscopy (OM), field emission scanning electron microscopy (SEM), high resolution transmission electron microscopy (TEM) and universal tensile testing machine. Meanwhile, the effect of final temperature of cooling on the microstructure and properties of the steel was carefully examined, and the grain refinement mechanism induced by microalloying elements was revealed. The results show that: the microstructure of the steel consists mainly of phases ferrite and pearlite, and the ferrite grain was refined with the decrease of the final temperature of cooling. The average diameter of precipitated carbides (Nb, Ti, V) C and (V, Nb, Ti) C distributed in the ferrite matrix of the steel is about 2 nm and 5 nm respectively for the final temperature of cooling 650℃. The tensile strength and yield strength of the steel increase with the decrease of the final temperature of cooling. When the final temperature of cooling is 650℃, the corresponding tensile strength and yield strength are 638.75 MPa and 467 MPa, respectively, and the strength/yield ratio is 1.37. The tensile fractured surface of steels, which have been experienced thermal simulation tests with different final temperatures of cooling, exhibits mainly equiaxed dimples of different sizes and depths.

Key words： metallic materials high-strength anti-seismic rebar final cooling temperature microstructure mechanical properties

收稿日期: 2021-01-18

ZTFLH:

TG142.1

基金资助:国家自然科学基金(52074095)

作者简介: 曾泽芸，男，1995年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.010 或 https://www.cjmr.org/CN/Y2021/V35/I11/857

表1 实验钢锭的化学成分

图1 实验钢的热模拟工艺

图2 不同终冷温度5道次热模拟轧制后实验钢的金相显微组织

表2 实验钢的微观组织比例及晶粒统计

图3 终冷温度为650℃的实验钢中(Nb, Ti, V)C析出物及其EDS图像、高分辨率晶格条纹相和电子衍射区

图4 终冷温度为650℃的实验钢中(V, Nb, Ti)C析出物及其EDS图像、高分辨率晶格条纹相和电子衍射区

图5 实验钢中析出物的比例分布

图6 在5道次热模拟条件下实验钢拉伸的应力-应变曲线

表3 实验钢的拉伸性能

图7 5道次热模拟轧制终冷温度不同的实验钢的拉伸断口形貌

表4 钢中Fe和析出相MC的相对密度

表5 终冷温度不同的实验钢中(Nb、V、Ti)C沉淀的体积分数

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