目的 解决双相不锈钢2205激光焊缝奥氏体相含量低的问题。方法 采用气流再压缩等离子焊接技术对双相不锈钢2205激光焊接接头进行重熔;然后,使用XRD、SEM、EBSD、EPMA和显微硬度计等手段对焊缝上表面进行组织结构表征和测试。结果 与激光焊接相比,气流再压缩等离子重熔焊缝上表面的奥氏体相体积分数提高442%,显微硬度提升9%。奥氏体晶界处和晶粒内部存在一定变形,并形成大量取向差小于2°的晶界,导致几何必要位错密度较高。奥氏体相中N元素质量分数为0.893%。与铁素体相相比,奥氏体相中Cr元素质量分数增加0.179%,Ni元素质量分数减少0.219%,Mo元素质量分数减少1.07%。结论 气流再压缩等离子重熔可显著提高双相不锈钢2205激光焊缝表面的奥氏体相含量,并提升焊缝表面显微硬度。尽管奥氏体相中Mo元素含量降低,但由于N元素含量提高,重熔焊缝中奥氏体相的耐点蚀性能优于铁素体相。
Abstract
The work aims to address the issue of low austenite phase content in laser welded joints of 2205 duplex stainless steel. The gas focusing plasma arc welding technique was used to remelt the laser welded joints of 2205 duplex stainless steel. Then, the characterization of the microstructure and performance test of the joint top surface were conducted through XRD, SEM, EBSD, EPMA, and microhardness testing. Compared to laser welding, the austenite content in the top surface of the remelted joint by gas focusing plasma arc welding increased by 442%, and the microhardness of the joint top surface improved by 9%. At the austenite grain boundaries and within the austenite grains, there was noticeable deformation, with a large number of grain boundaries exhibiting misorientation less than 2° and a high geometric dislocation density. The N element content in the austenite phase reached 0.893%. Compared to the ferrite phase, the Cr element content in the austenite phase increased by 0.179%, while the Ni element content decreased by 0.219%, and the Mo element content decreased by 1.07%. Gas focusing plasma arc welding remelting significantly increases the austenite phase content on the surface of laser welded joints of 2205 duplex stainless steel and enhances the microhardness of the joint surface. Although the Mo element content in the austenite phase is reduced, the increased N element content results in the austenite phase of the remelted joint by gas focusing plasma arc welding exhibiting superior pitting corrosion resistance compared to the ferrite phase.
关键词
双相不锈钢2205 /
等离子焊接 /
双相调控 /
奥氏体 /
焊缝
Key words
2205 duplex stainless steel /
plasma arc welding /
duplex regulation /
austenite /
welded joint
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