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
WANG Yanlin1,*, ZHANG Lingtong1,2, ZHANG Bowei1, QI Cai1, CHEN Xiaohua3, WANG Zidong1,3
1 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 Xiwang Metal Co., Ltd., Binzhou 256209, Shandong, China 3 State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
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.
王艳林, 张灵通, 张博炜, 綦才, 陈晓华, 王自东. 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[J]. 材料导报, 2023, 37(20): 22030303-7.
WANG Yanlin, ZHANG Lingtong, ZHANG Bowei, QI Cai, CHEN Xiaohua, WANG Zidong. 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. Materials Reports, 2023, 37(20): 22030303-7.
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2023, Vol. 37 
