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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application >Experimental investigation on dissimilar weld between super duplex stainless steel 2507 and API X70 pipeline steel
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Experimental investigation on dissimilar weld between super duplex stainless steel 2507 and API X70 pipeline steel

机译：超双工不锈钢2507和API X70管道钢不同焊接的实验研究

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摘要

This work investigates the microstructure and mechanical properties of 2507 super duplex stainless steel and API X70 high strength low alloy steel weld joint. This joint finds application in offshore hydrocarbon drilling riser and oil-gas pipelines. Coated shielded metal arc welding electrodes have been designed and extruded on 309L filler and their performance compared with a commercial austenitic electrode E309L. Filler 309L solidifies in ferrite-austenite (F-A) mode with a resultant microstructure comprising skeletal ferrites with austenite distributed in the interdendritic region. Results of tensile and impact tests indicate that weld fabricated with laboratory-developed electrodes has higher ductility and impact energy than the commercial electrode. The tensile strength and weld hardness of commercial electrodes are superior. The laboratory-made electrode's microhardness is lower than the commercial electrodes, making the former less prone to failure. An alternative welding electrode coating composition has been suggested through this work and found to be performing satisfactorily and comparable to the commercially available electrodes.
机译：这项工作调查了2507超双工不锈钢和API X70高强度低合金钢焊接接头的微观结构和机械性能。该关节在海上碳氢化合物钻孔提升管和油气管道中找到应用。与商业奥氏体电极E309L相比，已经在309L填料和它们的性能下设计和挤出了涂覆的屏蔽金属弧焊电极。填料309L以铁素体 - 奥氏体（F-A）模式凝固，具有由所得的微观结构，包括骨骼铁氧体，其分布在所述植入中的区段。拉伸和冲击试验的结果表明，用实验室开发的电极制造的焊缝具有比商业电极更高的延展性和冲击能量。商业电极的拉伸强度和焊接硬度优异。实验室制成的电极的微硬度低于商业电极，使前以前不易发生故障。通过这项工作提出了一种替代的焊接电极涂料组合物，并发现与市售电极令人满意地进行。

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