再加热温度对Nb微合金化钢筋连续冷却相变及组织与性能的影响

doi:10.11896/cldb.21100016

材料导报

2023, Vol. 37

Issue (8): 21100016-8 https://doi.org/10.11896/cldb.21100016

金属与金属基复合材料

再加热温度对Nb微合金化钢筋连续冷却相变及组织与性能的影响

卢超¹, 曹建春^1,*, 陈伟², 刘星¹, 张永青³, 阴树标⁴

1 昆明理工大学材料科学与工程学院,昆明 650093
2 武钢集团昆明钢铁股份有限公司,昆明 650302
3 中信微合金化技术中心,北京 100004
4 昆明理工大学冶金与能源工程学院,昆明 650093

Effect of Reheating Temperature on Continuous Cooling Transformation, Microstructure and Properties of Nb Microalloyed Rebar

LU Chao¹, CAO Jianchun^1,*, CHEN Wei², LIU Xing¹, ZHANG Yongqing³, YIN Shubiao⁴

1 School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
2 Wugang Group Kunming Iron and Steel Co., Ltd., Kunming 650302, China
3 CITIC Microalloying Technology Center, Beijing 100004, China
4 College of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China

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摘要利用热模拟试验机以再加热温度为1 000~1 100 ℃的条件对Nb微合金化钢筋形变奥氏体在不同冷却速率下的组织和相变规律进行研究,获得动态CCT曲线。研究结果表明,再加热温度的提高会降低铁素体相变温度,使珠光体、贝氏体相区向右移动。同时,再加热温度提高降低了铁素体组织的比例,使其硬度提高。在冷却速率小于2 ℃/s时,实验钢均得到均匀的铁素体+珠光体组织。不同实验条件下的析出相分析结果表明,由于再加热温度的提高有利于Nb的固溶,大颗粒未溶相含量降低,沉淀析出相尺寸减小、数量更多,有利于发挥沉淀强化作用,提高钢筋性能。

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关键词: 再加热温度 CCT曲线 Nb微合金化钢筋析出相

Abstract: The microstructure and phase transformation of deformed austenite of Nb microalloyed rebar under different cooling rates were studied with a thermal simulation tester at reheating temperature of 1 000—1 100 ℃, and the dynamic CCT curve was obtained. The results show that the increase of reheating temperature can reduce the ferrite transformation temperature and move the pearlite bainite phase region to the right. Moreover, the increase of reheating temperature reduces the proportion of ferrite structure and improves its hardness. When the cooling rate was less than 2 ℃/s, the experimental steel obtained uniform ferrite + pearlite structure. The analysis results of precipitated phase under different experimental conditions show that the increase of reheating temperature is conducive to the solid solution of Nb, the content of insoluble phase in large particles is reduced, the size of precipitated phase is reduced, and the quantity is more, which is conducive to playing the role of precipitation strengthening and improving the properties of rebar.

Key words: reheating temperature CCT curve Nb microalloyed rebar precipitate

出版日期: 2023-04-25 发布日期: 2023-04-24

ZTFLH:

TG142

基金资助: 国家自然科学基金(51261009);云南省教育厅科学研究基金产业化培育项目(2016CYH07);中信CBMM铌钢研究与开发项目(R＆D)

通讯作者: *曹建春,昆明理工大学材料科学与工程学院教授、博士研究生导师。1990—1997年在昆明理工大学获得金属材料及其热处理专业学士学位和铸造专业硕士学位,2006年昆明理工大学与钢铁研究总院联合培养材料学专业博士毕业后到昆明理工大学工作至今。目前主要从事先进钢铁材料、微合金化技术、金属材料组织控制基础研究等方面的工作。在国内外公开刊物上发表学术论文120余篇,获得授权发明专利30余项。nmcjc@163.com

作者简介: 卢超,2019年7月于安徽工业大学获得工学学士学位。现为昆明理工大学材料科学与工程学院硕博连读研究生,在曹建春教授的指导下进行研究。目前主要研究领域为微合金钢铁材料。

引用本文:

卢超, 曹建春, 陈伟, 刘星, 张永青, 阴树标. 再加热温度对Nb微合金化钢筋连续冷却相变及组织与性能的影响[J]. 材料导报, 2023, 37(8): 21100016-8.
LU Chao, CAO Jianchun, CHEN Wei, LIU Xing, ZHANG Yongqing, YIN Shubiao. Effect of Reheating Temperature on Continuous Cooling Transformation, Microstructure and Properties of Nb Microalloyed Rebar. Materials Reports, 2023, 37(8): 21100016-8.

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http://www.mater-rep.com/CN/10.11896/cldb.21100016 或 http://www.mater-rep.com/CN/Y2023/V37/I8/21100016

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