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Effect of Thermal Simulation Process on Microstructure of Seismic Steel Bars

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 metallograph...

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Autores principales: Huang, Sheng, Li, Changrong, Li, Zhiying, Zhuang, Changling, Zeng, Zeyun, Wang, Jie
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9147011/
https://www.ncbi.nlm.nih.gov/pubmed/35629463
http://dx.doi.org/10.3390/ma15103438
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author Huang, Sheng
Li, Changrong
Li, Zhiying
Zhuang, Changling
Zeng, Zeyun
Wang, Jie
author_facet Huang, Sheng
Li, Changrong
Li, Zhiying
Zhuang, Changling
Zeng, Zeyun
Wang, Jie
author_sort Huang, Sheng
collection PubMed
description 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.
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spelling pubmed-91470112022-05-29 Effect of Thermal Simulation Process on Microstructure of Seismic Steel Bars Huang, Sheng Li, Changrong Li, Zhiying Zhuang, Changling Zeng, Zeyun Wang, Jie Materials (Basel) Article 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. MDPI 2022-05-10 /pmc/articles/PMC9147011/ /pubmed/35629463 http://dx.doi.org/10.3390/ma15103438 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Huang, Sheng
Li, Changrong
Li, Zhiying
Zhuang, Changling
Zeng, Zeyun
Wang, Jie
Effect of Thermal Simulation Process on Microstructure of Seismic Steel Bars
title Effect of Thermal Simulation Process on Microstructure of Seismic Steel Bars
title_full Effect of Thermal Simulation Process on Microstructure of Seismic Steel Bars
title_fullStr Effect of Thermal Simulation Process on Microstructure of Seismic Steel Bars
title_full_unstemmed Effect of Thermal Simulation Process on Microstructure of Seismic Steel Bars
title_short Effect of Thermal Simulation Process on Microstructure of Seismic Steel Bars
title_sort effect of thermal simulation process on microstructure of seismic steel bars
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9147011/
https://www.ncbi.nlm.nih.gov/pubmed/35629463
http://dx.doi.org/10.3390/ma15103438
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