316L-20G双金属复合管焊缝组织元素扩散分析

通过对20G钢内衬316L金属复合管的焊缝区、316L基体以及20G钢进行EDS元素扫描,再采用扫描电镜对316L焊缝区、20G钢焊缝区进行线扫描分析,对焊缝组织主要合金元素的扩散进行了研究。结果表明：焊缝过渡层中合金元素被碳钢稀释,碳原子向316L和焊缝扩散,同时316L和焊丝中的合金元素Cr、Ni也向碳钢中渗透,但过渡层起到了良好的隔离作用,致使316L不锈钢金属中合金元素含量没有明显降低,保持了316L母材耐腐蚀性能。

Analysis on weld metal and element migration of 316L-20G clad pipe

The proliferation of weld and major alloying elements are studied and analyzed by scanning the EDS element of 316L/20G clad pipe weld joint, 316L substrate and 20G steel, and by scanning the electron microscopy and the energy spectrum analysis of 316L-weld zone and 20G steel-weld zone. The results show that the alloying elements in the weld transition layer are diluted by carbon steel, and the carbon atoms spread to the 316L and weld, while alloying elements in the 316L and wire, such as Cr, Ni, penetrate to the carbon steel, but the transition layer plays a good role in isolation, resulting in 316L stainless steel alloy element content is not significantly reduced, maintaining the 316L base metal resistant to corrosion.