高强韧弹簧钢中Ti-V-B-N-C系微量元素耦合热力学分析及其对第二相析出行为的影响

doi:10.11896/cldb.22030303

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Abstract The multiple microelements are the key factors to determine the properties of high strength and toughness steels, and the form of microelements in steel is mainly solid solution in iron matrix and formation of corresponding secondary phase. Based on the coupling theory of multiple microelements, the coupling thermodynamic model was constructed, and the solid solution and precipitation behavior of multiple microelements was analyzed in Ti-V-B-N-C system spring steel, the solid solution amount of each microelement at different temperatures was calculated through thermodynamics, and the quantitative relationship between the multiple microelements system and the content of secondary phases at different temperatures was also determined. The hardness for the quenching structure of spring steel was tested, and the microstructure was cha-racterized. The research shows that the [V]was 0.038 392 66%, [Ti]was 3.295×10^-5%, [B]was 3.860 8×10^-4%, [N]was 3.08×10^-6%, [C]was 0.451 987 09% at 850 ℃ in Ti0.016-V0.15-N0.004-C0.48-B0.0014 system spring steel 50-S2#, and the hardenability of material 50-S2# was the best when the quenched temperature was 850 ℃, when the distance from the quenched end face was 27 mm, the microstructure was martensite and bainite (about 30%), the HRC was 53.0. It’s verified that the hardenability of spring steel can be greatly improved by scientifically ensuring that there is a certain amount of trace solid-soluted boron (B) element existed in the matrix at the quenching temperature.

Key words： high strength and toughness steel multiple microelements thermodynamic analysis multiple nanoparticles precipitation behavior

Published: 25 October 2023 Online: 2023-10-19

CLC number:

TG142

Fund:National Natural Science Foundation of China (52071012), Central Funds Guiding the Local Science and Techno-logy Development Fundamental Research (YDZX2021005) and the Academic and Technical Leaders of Major Disciplines in Jiangxi Province (20182BCB22020).

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	WANG Yanlin
	ZHANG Lingtong
	ZHANG Bowei
	QI Cai
	CHEN Xiaohua
	WANG Zidong

Cite this article:

WANG Yanlin,ZHANG Lingtong,ZHANG Bowei, et al. Thermodynamic Analysis for the Ti-V-B-N-C System Microelements Coupling and Its Effects on the Secondary Phase Precipitation Behavior in High Strength and Toughness Spring Steels[J]. Materials Reports, 2023, 37(20): 22030303-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22030303 OR http://www.mater-rep.com/EN/Y2023/V37/I20/22030303

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