The Microstructural Causes of Intergranular Corrosion of Alloys 82 and 182
The Microstructural Causes of Intergranular Corrosion of Alloys 82 and 182
复制标题
82、182合金晶间腐蚀的显微组织原因
作者：
C. Briant;E. Hall
本文研究了182和82镍基焊缝金属晶间腐蚀（IGC）的微观组织原因。对未焊接的电极材料和由电极的各种生产加热制成的焊缝进行了检查。在所有情况下，发现在各种热老化处理后，合金182的腐蚀明显大于合金82。这种差异可归因于以下事实：富铬碳化物沿着晶界的沉淀导致合金182中的铬消耗多于合金82。182合金中铬消耗量较大是因为它的基体中含有比82合金更多的碳和铁以及更少的铬。合金82的焊缝如果在焊接过程中吸收了碳，可能会对IGC敏感。
Abstract This paper reports a study of the microstructural causes of intergranular corrosion (IGC) in the nickel base weld metals designated as Alloy 182 and Alloy 82. Both unwelded electrode material and welds made from various production heats of the electrodes were examined. In all cases, it was found that Alloy 182 corroded significantly more than Alloy 82 after various thermal aging treatments. This difference could be attributed to the fact that the precipitation of chromium-rich carbides along the grain boundaries caused more chromium depletion in Alloy 182 than in Alloy 82. The greater amount of chromium depletion in Alloy 182 resulted from the fact that it contains more carbon and iron and less chromium in its matrix than Alloy 82. Welds of Alloy 82 could be made susceptible to IGC if they picked up carbon during the welding process.