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

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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

Published: 25 April 2023 Online: 2023-04-24

CLC number:

TG142

Fund:National Natural Science Foundation of China (51261009), Industrialization Cultivation Project of Scientific Research Foundation of Yunnan Provincial Department of Education (2016CYH07), and CITIC CBMM Niobium Steel Research and Development Project (R＆D).

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	Articles by authors
	LU Chao
	CAO Jianchun
	CHEN Wei
	LIU Xing
	ZHANG Yongqing
	YIN Shubiao

Cite this article:

LU Chao,CAO Jianchun,CHEN Wei, et al. Effect of Reheating Temperature on Continuous Cooling Transformation, Microstructure and Properties of Nb Microalloyed Rebar[J]. Materials Reports, 2023, 37(8): 21100016-8.

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http://www.mater-rep.com/EN/10.11896/cldb.21100016 OR http://www.mater-rep.com/EN/Y2023/V37/I8/21100016

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