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首页> 外文期刊>Journal of Laser Applications >Effect of laser and laser hybrid welding on the corrosion performance of a lean duplex stainless steel
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Effect of laser and laser hybrid welding on the corrosion performance of a lean duplex stainless steel

机译：激光和激光混合焊接对贫双相不锈钢腐蚀性能的影响

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The use of duplex stainless steel increases steadily worldwide and the fluctuations in nickel price the recent years have contributed to further growth. The lean duplex grade Outokumpu LDX 2101~? (EN 1.4162, UNS S32101) has a low nickel content and is alloyed with nitrogen and manganese to give a balanced microstructure. It means that good austenite formation is obtained even when laser welding autogenously (without filler). This is in contrast to most other duplex grades, for which laser welding is normally associated with high ferrite fractions, known to reduce the ductility and corrosion performance. Nd:YAG, CO_2 and fiber laser welding of LDX 2101~? has been performed with and without filler wire and as laser hybrid welding with gas tungsten arc (GTA) and gas metal arc (GMA). The microstructure was evaluated and related to the corrosion performance, and the mechanical properties are presented. The austenite formation in autogenously laser welded LDX 2101~? is not sufficient to completely avoid chromium nitride precipitation and the weld metal pitting resistance is consequently affected. This is particularly seen when fiber laser welding. The mechanical properties of all welds were on a similar level with those of the base metal, while the corrosion performance and ductility were marginally to significantly lower. Use of filler wire when Nd:YAG laser welding and Nd:YAG laser-GTA hybrid welding with and without filler wire, and nitrogen additions to the GTA shielding gas improved the austenite formation and hence the pitting resistance. CO_2 laser and CO_2 laser-GMA hybrid welding proved to result in most austenite and generally showed the highest pitting resistance of all laser welds.
机译：在世界范围内，双相不锈钢的使用稳步增长，近年来镍价的波动为进一步增长做出了贡献。贫油双相钢Outokumpu LDX 2101〜？ （EN 1.4162，UNS S32101）的镍含量低，并且与氮和锰合金化以提供平衡的微观结构。这意味着即使自发激光焊接（无填料）也能获得良好的奥氏体形成。这与大多数其他双相不锈钢不同，后者通常将激光焊接与高铁素体含量相关联，众所周知，这会降低延展性和腐蚀性能。 Nd：YAG，CO_2和LDX 2101〜？的光纤激光焊接已经在有无填充焊丝的情况下进行了焊接，并与气体钨极电弧（GTA）和金属气体电弧（GMA）进行了激光混合焊接。对组织进行了评估并与腐蚀性能相关，并提出了机械性能。自发激光焊接LDX 2101〜？中的奥氏体形成不足以完全避免氮化铬沉淀，因此会影响焊接金属的耐点蚀性。这在光纤激光焊接时尤其明显。所有焊缝的机械性能与母材处于相似的水平，而腐蚀性能和延展性略有降低。在Nd：YAG激光焊接和Nd：YAG激光-GTA混合焊接（有无焊丝的情况下）和Nd：YAG激光-GTA混合焊的情况下使用焊丝，以及在GTA保护气体中添加氮，可以改善奥氏体的形成，从而改善耐点蚀性。事实证明，CO_2激光和CO_2激光-GMA混合焊接可产生大多数奥氏体，并且通常在所有激光焊接中显示出最高的耐点蚀性。

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