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Investigations on structure-property relationships of activated flux TIG weldments of super-duplex/austenitic stainless steels

机译:超级双相/奥氏体不锈钢的活性焊剂氩弧焊焊件的结构性能关系研究

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This research work articulated the effect of SiO_2 flux assisted tungsten inert gas (TIG) welding on the microstructure and mechanical properties of marine grade stainless steel weldments, such as super-duplex stainless steel (UNS S32750) and austenitic stainless steel (AISI 316L). The studies showed that the use of flux decreased the heat input required to obtain complete penetration. Microstructure studies revealed the presence of ferrite at the heat affected zone of AISI 316L and the fusion zone which obviated the hot cracking tendency. Tensile studies corroborated that the joint strength was sufficiently greater than that of the parent metals. Impact toughness slightly impoverished owing to the presence of large platelets of Widmanstatten austenite in the fusion zone. The study also explored the structure-property relationships of the flux assisted weldments using the combined techniques of optical and scanning electron microscopy analysis. Owing to the better metallurgical and mechanical properties, this study recommends the use of SiO_2 flux for joining the dissimilar metals involving austenitic and super-duplex stainless steels.
机译:这项研究工作阐明了SiO_2助焊剂钨极惰性气体(TIG)焊接对船用级不锈钢焊件(如超级双相不锈钢(UNS S32750)和奥氏体不锈钢(AISI 316L))的组织和力学性能的影响。研究表明,使用助焊剂会降低获得完全渗透所需的热量输入。显微组织研究表明,在AISI 316L的热影响区和熔合区存在铁素体,从而消除了热裂纹倾向。拉伸研究证实,接头强度比母体金属足够大。由于在熔合区中存在大块的威德斯塔汀奥氏体,因此冲击韧性略有下降。该研究还使用光学和扫描电子显微镜分析相结合的技术,探索了助焊剂的焊缝结构与性能之间的关系。由于具有更好的冶金和机械性能,本研究建议使用SiO_2助熔剂来连接涉及奥氏体和超双相不锈钢的异种金属。

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