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Interface microstructure and properties of submerged arc brazing tin-based babbit 预览

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摘要 The submerged arc brazing method was used to connect the tin-based babbit alloy with the steel matrix.The microstructure of the submerged arc brazed Babbitt interface layer on the surface of Q235B steel was analyzed by OM,SEM and EDS and the hardness properties of the joint interface layer were tested by MH-5 microhardness tester.the result of research shows that a layer of canine-shaped intermetallic compound with uneven thickness is formed at the interface,and the thickness is 10–20μm.The interface layer includes two kinds of compound layers,namely the FeSn layer near the side of the steel substrate and FeSn2 layer near the side of the babbit.During the interfacial reaction process,Fe atoms in the steel matrix dissolve into the liquid babbit alloy and form a certain concentration gradient at the interface.The farther from the interface,the lower the Fe atom concentration.The growth of Gibbs free energy of FeSn is lower when the temperature is above 780.15 K,and the temperature during the welding process is much higher than 780.15 K,moreover the precipitation temperature of FeSn is higher.Therefore,in the subsequent cooling process,FeSn is first precipitated from the interface near the side of steel matrix and then FeSn2 is precipitated from the interface near the side of babbit alloy.Microhardness test showed that the intermetallic compound at the interface layer significantly improved the hardness properties.
作者 周方明 李敬 徐冬豪 石铭霄 Zhou Fangming;Li Jing;Xu Donghao;Shi Mingxiao(Jiangsu Province Key Laboratory of Advanced Welding Technology,Jiangsu University of Science and Technology,Zhenjiang 212003,China;School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China)
机构地区 不详
出处 《中国焊接:英文版》 EI CAS 2019年第2期45-49,共5页 China Welding
基金 the University Natural Science Research Project of Jiangsu Province(Grant No.15KJA460006).
作者简介 Corresponding author:Zhou Fangming,(1964–),PhD,Professor.Mainly engaged in welding equipment and quality control.E-mail:fangmingzhou@just.edu.cn。
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