| HRB400E抗震螺纹钢静态CCT曲线测定及组织分析 |
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| 引用本文： | 骆艳萍,汪家晗,李沐泽,张云祥,周建勋,赵志恒.HRB400E抗震螺纹钢静态CCT曲线测定及组织分析[J].金属热处理,2022,47(9):188-193. |
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| 作者姓名： | 骆艳萍 汪家晗 李沐泽 张云祥 周建勋 赵志恒 |
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| 作者单位： | 1.中冶南方工程技术有限公司, 湖北 武汉 430223;2.武汉科技大学 钢铁冶金及资源利用省部共建教育部重点实验室, 湖北 武汉 430081;3.武钢集团昆明钢铁股份有限公司, 云南 安宁 650302 |
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| 基金项目： | 国家自然科学基金(51774219) |
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| 摘 要： | 利用膨胀法在Gleeble-3500热模拟试验机上测定了HRB400E抗震螺纹钢的静态连续冷却转变(CCT)曲线,采用光学显微镜OM、扫描电镜SEM和显微维氏硬度仪观察和测定了不同冷却速度下钢的显微组织和硬度,分析了冷却速度对该钢相变组织与性能的影响。结果表明,当冷速在3 ℃/s以下时,试验钢中组织为铁素体和珠光体,随着冷速的提高,试验钢中珠光体含量逐渐提高,片层间距不断减小;当冷速为4~10 ℃/s时,试验钢中开始出现贝氏体组织;当冷速＞10 ℃/s时,试验钢开始发生马氏体相变;并且随着冷速的提高,试验钢的硬度逐渐提高。冷却速度为2~3 ℃/s范围内,试验钢中珠光体含量、片层间距和力学性能均满足GB/T 1499.2—2018中规定,其结果与现场生产性能检验结果相符。在冷速为3 ℃/s生产的?8 mm盘螺成品试样的珠光体含量和片层间距分别为47%和0.184 μm,下屈服强度ReL、抗拉强度Rm、强屈比Rm/ReL、屈标比ReL/RseL、断后伸长率A、最大力总伸长率Agt分别为440 MPa、569 MPa、1.29、1.10、27.2%和17.8%。
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| 关 键 词： | 抗震螺纹钢20MnSiV CCT曲线 冷却速率 组织 性能 |
| 收稿时间： | 2022-05-27 |
Static CCT curve measurement and microstructure analysis of HRB400E anti-seismic structural rebar |
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| Luo Yanping,Wang Jiahan,Li Muze,Zhang Yunxiang,Zhou Jianxun,Zhao Zhiheng.Static CCT curve measurement and microstructure analysis of HRB400E anti-seismic structural rebar[J].Heat Treatment of Metals,2022,47(9):188-193. |
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| Authors: | Luo Yanping Wang Jiahan Li Muze Zhang Yunxiang Zhou Jianxun Zhao Zhiheng |
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| Affiliation: | 1. WISDRI Engineering & Research Incorporation Limited,Wuhan Hubei 430223, China;2. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan Hubei 430081, China;3. Wugang Group Kunming Iron and Steel Co. , Ltd. , Anning Yunnan 650302, China |
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| Abstract: | The static continuous cooling transformation (CCT)experiments for anti-seismic rebar steel HRB400E were conducted on Gleeble-3500 thermal simulation test machine by expansion method, The microstructure and hardness of the steel under different cooling rates were observed and measured by optical microscope (OM), scanning electron microscope (SEM) and micro-Vickers hardness tester, and the effect of cooling rate on the transformation structure and properties of the steel was analyzed. The results show that when the cooling rate is below 3 ℃/s, the microstructure of the tested steel is ferrite and pearlite. With the increase of cooling rate, the pearlite content in the tested steel increases gradually and the lamellar spacing decreases. Bainite appears in the tested steel when the cooling rate is 4-10 ℃/s. When the cooling rate is higher than 10 ℃/s, the tested steel begins to undergo martensitic transformation. With the increase of cooling rate, the hardness of the tested steel increases gradually. When the cooling rate is within the range of 2-3 ℃/s, the pearlite content, lamellar spacing and mechanical properties of the tested steel meet the technical requirements of the national standard GB/T 1499.2—2018. The experimental results are in good agreement with the mechanical properties of industrial products, in which, the pearlite content and lamellar spacing of the finished specimen of ?8 mm rebar at the cooling rate of 3 ℃/s are 47% and 0.184 μm respectively, and yield strength ReL, tensile strength Rm, ratio of Rm/ReL, ratio of ReL/RseL, fracture total elongation A and total elongation at maximum force Agt are 440 MPa, 569 MPa, 1.29, 1.10, 27.2% and 17.8%, respectively. |
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| Keywords: | anti-seismic structural rebar HRB400E CCT curves cooling rate microstructure properties |
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