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热模拟工艺对抗震钢筋微观结构的影响

Effect of Thermal Simulation Process on Microstructure of Seismic Steel Bars.

作者信息

Huang Sheng, Li Changrong, Li Zhiying, Zhuang Changling, Zeng Zeyun, Wang Jie

机构信息

College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China.

Guizhou Province Key Laboratory of Metallurgical and Process Energy Saving, Guiyang 550025, China.

出版信息

Materials (Basel). 2022 May 10;15(10):3438. doi: 10.3390/ma15103438.

DOI:10.3390/ma15103438
PMID:35629463
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9147011/
Abstract

Thermal deformation has a significant influence on the microstructure of high-strength antiseismic steel. The effect of hot deformation on the microstructure of experimental steel was studied by the Gleeble-3800 thermal simulator. The microstructure of the steel was characterized by the metallographic microscope, microhardness, tensile test, field emission scanning electron microscope, electron backscatter diffraction, and high-resolution transmission electron microscope. The results show that the core microstructure of the test steel is composed of polygonal ferrite and lamellar pearlite. The test steel is mainly ductile fracture. Tensile strength and hardness increase with the decrease of temperature. At 650 °C isothermal temperature, the ferrite distribution was uniform, the average grain size was 7.78 μm, the grain size grade reached 11, the pearlite lamellar spacing was 0.208 μm, and the tensile fracture was distributed with uniform equiaxed dimples. Polygonal ferrite grain boundaries have high density dislocations that can effectively block the initiation and propagation of cracks. However, there are some low dislocation boundaries and subgrain boundaries in ferrite grains. Precipitation strengthening is mainly provided by fine precipitates of V-rich carbonitride in experimental steel. The precipitates are round or narrow strips, about 70-100 nm in size, distributed along ferrite grain boundaries and matrix.

摘要

热变形对高强度抗震钢的微观组织有显著影响。利用Gleeble-3800热模拟试验机研究了热变形对试验钢微观组织的影响。采用金相显微镜、显微硬度测试、拉伸试验、场发射扫描电子显微镜、电子背散射衍射和高分辨率透射电子显微镜对试验钢的微观组织进行了表征。结果表明，试验钢的核心组织由多边形铁素体和片状珠光体组成。试验钢主要为韧性断裂。抗拉强度和硬度随温度降低而增加。在650℃等温温度下，铁素体分布均匀，平均晶粒尺寸为7.78μm，晶粒度等级达到11级，珠光体片层间距为0.208μm，拉伸断口分布有均匀的等轴韧窝。多边形铁素体晶界存在高密度位错，能有效阻碍裂纹的萌生和扩展。然而，铁素体晶粒内部存在一些低位错边界和亚晶界。试验钢的析出强化主要由富V碳氮化物的细小析出物提供。析出物呈圆形或窄条状，尺寸约为70-100nm，沿铁素体晶界和基体分布。

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