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  

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

作　　者：王艳林[1] 张灵通 张博炜 綦才 陈晓华[3] 王自东[1,3] WANG Yanlin;ZHANG Lingtong;ZHANG Bowei;QI Cai;CHEN Xiaohua;WANG Zidong(School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China;Xiwang Metal Co.,Ltd.,Binzhou 256209,Shandong,China;State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]西王金属有限公司,山东滨州256209 [3]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《材料导报》2023年第20期158-164,共7页Materials Reports

基　　金：国家自然科学基金(52071012);中央引导地方科技发展资金基础研究(YDZX2021005);江西省主要学科学术和技术带头人资助计划(20182BCB22020)。

摘　　要：多元微量元素是决定高强韧钢性能的关键因素,其在钢中存在的形式主要为固溶于铁基体中和形成相应的第二相。基于多元微量元素耦合理论,构建其耦合热力学模型,并对Ti-V-B-N-C系弹簧钢中多元微量元素固溶-析出行为进行了分析,通过热力学计算出不同温度下各微量元素的固溶量以及多元微量元素体系与第二相含量间的定量关系,对弹簧钢淬火组织的硬度进行检测,以及对其组织微结构进行表征。研究表明,在850℃时,Ti0.016-V0.15-N0.004-C0.48-B0.0014系弹簧钢50-S2#中[V]为0.03839266%,[Ti]为3.295×10^(-5)%,[B]为3.8608×10^(-4)%,[N]为3.08×10-6%,[C]为0.45198709%,且此温度下淬火时其淬透性能最佳,在距淬火端面27 mm处,其组织为马氏体+贝氏体(约30%),硬度达HRC53.0。这验证了在淬火温度下科学确保弹簧钢基体中存在一定的痕量固溶B元素可大幅改善其淬透性能。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 0.03839266%,[Ti]was 3.295×10^(-5)%,[B]was 3.8608×10^(-4)%,[N]was 3.08×10-6%,[C]was 0.45198709%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.

关 键 词：高强韧钢 多元微量元素 热力学分析 多元纳米相 析出行为 

分 类 号：TG142[一般工业技术—材料科学与工程]