Ferrite features in simulated transition zone of EH36 shipbuilding steel submerged arc welded by CaF_(2)-SiO_(2)-MnO fluxes  

作　　者：Ming Zhong Dong Hu Da-ming Guo Somnath Basu Cong Wang 

机构地区：[1]Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education),Northeastern University,Shenyang 110819,Liaoning,China [2]School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China [3]The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China [4]Department of Metallurgical Engineering and Materials Science,Indian Institute of Technology Bombay,Mumbai 400076,Maharashtra,India

出　　处：《Journal of Iron and Steel Research International》2024年第4期790-796,共7页

基　　金：the Spring Sunshine Plan(Chunhui)Research Project of Ministry of Education of China(Grant No.HZKY20220437);the State Key Laboratory of Refractories and Metallurgy(Grant No.G202206);the National Natural Science FoundationofChina(Grant Nos.U20A20277 and 52150610494);the National Key Research and Development Program of China(Grant No.2022YFE0123300).

摘　　要：Ferrite features in the simulated transition zone welded with CaF_(2)-SiO_(2)-MnO fluxes containing various MnO contents have been investigated.Confocal laser scanning microscopy has been applied to simulate the thermal cycling of the transition zone and the phase transformations during cooling have been in-situ observed.It has been found that the appearance temperature for ferrite side plate decreases with increasing Mn content in the weld metals caused by MnO content increasing.Meanwhile,growth rates for both ferrite side plate and acicular ferrite are significantly enhanced with a higher Mn content of weld metal.Furthermore,from the statistical fractions of salient microstructures,for all samples,the acicular ferrite,grain boundary ferrite,and polygonal ferrite take over more than 90%.It has also been demonstrated that with the increase in Mn content,the ferrite side plate fraction increases slightly from 5%to 10%and the acicular ferrite fraction shows a tendency of first increasing and then decreasing,which experiences the maximum with the flux containing 30 wt.%MnO.This phenomenon is believed to be controlled by the O and Mn contents in weld metals synergistically.

关 键 词：Submerged arc welding Transition zone Phase transformation Microstructure 

分 类 号：TG142[一般工业技术—材料科学与工程]