Microstructure and Corrosion Properties of Austenitic and Duplex Stainless Steel Dissimilar Joints

IF 1.3 Q3 ENGINEERING, MECHANICAL

PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING Pub Date : 2022-10-06 DOI:10.3311/ppme.21007

B. Varbai, Patrik Bolyhos, D. Kemény, K. Májlinger

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引用次数: 2

Abstract

In several applications duplex stainless steels should be joint welded to conventional austenitic stainless steels. In this research LDX 2101 lean duplex stainless steel sheets were welded to conventional 304 austenitic stainless steels, using gas tungsten arc welding. For the welded joints three different welding rods were used: ER 308L, ER 309LSi, and ER 2209. For gas shielding two different shielding gases were used: argon and argon +2% nitrogen. It was found that the nitrogen addition to the shielding gas promoted austenite formation in the weld metal. It was also found Schaeffler-diagram modified by Outokumpu showed a very good estimation to the ferrite content and chemical composition of the weld metal. The ferrite content estimated by the Outokumpu-diagram, showed a close correlation to measured ferrite contents, the highest error was 30%. In case of the chemical composition of the weld metal, the Cr- and Ni-contents were estimated with a maximum of 15% error. In terms of the corrosion resistance, the best pitting corrosion resistance was achieved using the 308L welding rod with argon shielding gas, where the weight loss was 1.6% after the 24 hours immersion test.

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奥氏体与双相不锈钢异种接头的组织与腐蚀性能

在一些应用中，双相不锈钢应与传统奥氏体不锈钢连接焊接。本研究采用钨气弧焊将ldx2101贫双相不锈钢薄板与普通304奥氏体不锈钢进行焊接。焊接接头采用三种不同的焊条:er308l、er309lsi和er2209。气体保护采用两种不同的保护气体:氩气和氩气+2%氮气。结果表明，在保护气体中加入氮气促进了焊缝中奥氏体的形成。同时发现经Outokumpu修正的schaeffler图能很好地估计焊缝金属的铁素体含量和化学成分。用奥托kumpu图估计的铁素体含量与实测铁素体含量具有密切的相关性，误差最高可达30%。对于焊缝金属的化学成分，估计Cr-和ni -含量的最大误差为15%。在耐蚀性方面，使用氩气保护的308L焊条的耐点蚀性能最好，浸泡24小时后，焊条的减重率为1.6%。

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来源期刊

PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING ENGINEERING, MECHANICAL-

CiteScore

2.80

自引率

7.70%

发文量

审稿时长

20 weeks

期刊介绍： Periodica Polytechnica is a publisher of the Budapest University of Technology and Economics. It publishes seven international journals (Architecture, Chemical Engineering, Civil Engineering, Electrical Engineering, Mechanical Engineering, Social and Management Sciences, Transportation Engineering). The journals have free electronic versions.