Nb微合金化对Q500MPa级热轧H型钢组织和性能的影响

doi:10.11896/cldb.19060045

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Abstract The effect of Nb on the microstructures and properties of H-beam steel was investigated by nanoindentation test,, EBSD and transmission electron microscope. The results show that yield strength and low temperature impact energy at -20 ℃ reaches 552 MPa and 102 J of H-beam steel containing 0.025wt% Nb, which are 17.7% and 20.0% higher than those without Nb, respectively, under the same rolling and coo-ling condition. In addition, grain size is refined from 5 μm to 4 μm. The interface energy between matrix and (Nb_1-xV_x)C formed in ferrite matrix is smaller than that between NbC and matrix by thermodynamic calculation, which promote the precipitation of Nb composite precipitates. And the average size of nano-precipitates in ferrite matrix decreases from 16.3 nm to 11.46 nm, and the volume fraction of which increases from 0.053% to 0.108%, as a result of precipitation strengthening increasing from 55 MPa to 102 MPa. The hardness of ferrite matrix increases from 247HV to 279HV, and the contribution of precipitation strengthening after adding Nb is 18 MPa, which is greater than that of fine grain strengthening.

Key words： precipitation strengthening Nb micro-alloyed microstructures and mechanical properties interface energy

Published: 14 July 2020

CLC number:

TG161

About author:: Zhang Huang, post-graduate student, received his bachalor degree in engineering from Nanchang Hangkong University in 2017.
Hao Yuobtained his M.E. degree from the University of Science and Technology Beijing (USTB) and served in School of Materials of Science and Engineering, USTB till now. He is currently a professor and doctoral supervisor. He was selected as Beijing Science and Technology Nova Award Program in July 2004. He was supported by Huo Yingdong Youth Foundation in October 2005, and awarded the fourth section of Metallurgical Youth Science and Technology Award of China Me-tal Society in 2010. He has published more than 120 papers, applied for 15 national patents. The main research fields are control rolling technology and organizational performance, microstructures and properties of steel composite control theory and application research, metal plastic processing and forming process simulation.

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	HUANG Zhang
	DU Chuanzhi
	FANG Jinlin
	YU Hao
	LI Shuying
	SONG Chenghao
	DUAN Xiaoni

Cite this article:

HUANG Zhang,DU Chuanzhi,FANG Jinlin, et al. Effect of Niobium Micro-alloyed on Microstructures and Mechanical Properties of Q500MPa Hot-Rolled H-beam Steel[J]. Materials Reports, 2020, 34(14): 14175-14180.

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http://www.mater-rep.com/EN/10.11896/cldb.19060045 OR http://www.mater-rep.com/EN/Y2020/V34/I14/14175

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