Role of inclusions in flux aided backing submerged arc welding

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• 作者：Juan Pu^a ; ^b ; ^{pu_juan84@163.com" class="auth_mail" title="E-mail the corresponding author} ; Shengfu Yu^a ; ^{yushengfu2016@163.com" class="auth_mail" title="E-mail the corresponding author} ; Yuanyuan Li^b ; ^{liyuan2505@163.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Inclusions ; Thermodynamic calculation ; Flux aided backing submerged arc welding (FAB-SAW) ; CeO2-containing alloy powders ; Microstructure
• 刊名：Journal of Materials Processing Technology
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：240
• 期：Complete
• 页码：145-153
• 全文大小：6691 K

文摘

The formation of inclusions and their roles in Ce microalloyed weld metal by flux aided backing submerged arc welding (FAB-SAW) were studied by combining experimental investigation and thermodynamic calculation. The results showed that in Ce microalloyed weld metal, the core of effective inclusions was composed of Ce₂O₃, Al₂O₃, SiO₂, MnO, and TiO compound oxides, while the surface of inclusions was composed of CeS. The first-formed Ce₂O₃ particles in molten pool provided more nucleation sites for Al, Si, Mn, Ti oxides and CeS, which promoted an increase on the areal density and a decrease on the mean diameter of inclusions. The small sized inclusions increased the formation of acicular ferrite (AF) and suppressed the formation of grain boundary ferrite (GBF) and ferrite side-plate (FSP). The elongation, tensile strength and impact toughness of weld metals were improved with the increasing amount of AF. When 3.0 wt.% CeO₂ was added, the highest proportion of AF was obtained, producing the optimal mechanical properties of weld metal with elongation of 24%, tensile strength of 635 MPa and impact energy of 89 J at −20 °C.