Effect of welding processes on ferrite content, microstructure and mechanical properties of super duplex stainless steel 2507 welds

IF 2.4 4区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Testing Pub Date : 2023-09-27 DOI:10.1515/mt-2023-0002

Chandragiri Baskar Sekar, Sajja Rama Koteswara Rao, Sundaravel Vijayan, Sadayan Rajendra Boopathy

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引用次数: 0

Abstract

Abstract Super duplex stainless steel (SDSS) plates of 6 mm thickness have been welded using tungsten inert gas, activated tungsten inert gas, electron beam welding and friction stir welding processes. Among these, in the first two, melting and solidification of material occurs slowly whereas, it is faster in electron beam welding process and no melting occurs in friction stir welding. Macro and microstructural studies, hardness surveys, tensile tests and percentage of ferrite content were compared for all the welds. The ferrite–austenite phase balance is 50 % each, with electron beam weld metal at about 65 % ferrite. This showed the hardness of the weld metal and heat affected zones to be higher than base metal. The weldment joint efficiencies are more than 90 %. The fracture location is found to be in the weld metal for tungsten inert gas and activated tungsten inert gas weld, in the nugget for friction stir welds and in the base metal for electron beam welds. The ductility of electron beam weld joints is 32 % while it is around 20 % for the others. The preferred order while choosing the welding process should be activated tungsten inert gas welding, tungsten inert gas welding, electron beam welding, and friction stir welding.

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焊接工艺对超级双相不锈钢2507焊缝铁素体含量、组织和力学性能的影响

摘要采用钨惰性气体、活化钨惰性气体、电子束焊和搅拌摩擦焊等工艺对6mm厚的超级双相不锈钢(SDSS)板进行了焊接。其中，在前两种焊接工艺中，材料的熔化和凝固速度较慢，而电子束焊接工艺的熔化和凝固速度较快，搅拌摩擦焊接工艺则不发生熔化。对所有焊缝进行了宏观和微观组织研究、硬度调查、拉伸试验和铁素体含量百分比的比较。铁素体-奥氏体相平衡各为50%，电子束焊接金属的铁素体含量约为65%。这表明焊接金属的硬度和热影响区高于母材。焊件接头效率达90%以上。钨惰性气体和活化钨惰性气体焊的断口在焊缝金属中，搅拌摩擦焊的断口在熔核中，电子束焊的断口在母材中。电子束焊接接头的延展性为32%，而其他焊接接头的延展性在20%左右。在选择焊接工艺时，应优先考虑活化钨惰性气体焊、钨惰性气体焊、电子束焊、搅拌摩擦焊。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Testing 工程技术-材料科学：表征与测试

CiteScore

4.20

自引率

36.00%

发文量

165

审稿时长

4-8 weeks

期刊介绍： Materials Testing is a SCI-listed English language journal dealing with all aspects of material and component testing with a special focus on transfer between laboratory research into industrial application. The journal provides first-hand information on non-destructive, destructive, optical, physical and chemical test procedures. It contains exclusive articles which are peer-reviewed applying respectively high international quality criterions.