铝含量对Monel合金组织与性能的影响

Effects of Al Contents on Microstructure and Properties of Monel Alloys

摘要:

通过OM、SEM、失重法和电化学方法研究了含铝量对蒙乃尔（Monel）合金组织及性能的影响。结果表明：随着铝含量从2%逐渐增加到4%（质量分数，下同），存在于枝晶间的离异γ′共晶相的面积比率逐渐增大；并且在不同的铝含量下，该含铝Monel合金在模拟海水中的腐蚀形式为点蚀，同时，随着铝含量的逐渐增加，该含铝Monel合金在模拟海水中的耐蚀性先增强后减弱。当铝含量为3%时，合金的耐蚀性达到本实验范围内的最佳。

关键词:Monel合金;含铝量;组织和性能

Abstract:

The effects of Al content on microstructure and properties of Monel alloy were studied by OM, SEM, an electrochemistry method and a mass loss method. The results show that the area ratio of divorcing eutectic γ′ in the interdendritic area gradually becomes larger with increasing of Al content from 2% to 4% (mass fraction). The mechanism of corrosion in the simulative sea water is pit corrosion under the conditions of different Al contents. Meanwhile, as the Al content increases, the corrosion resistance of the alloy in the simulative sea water increases first but then decreases. The Monel alloy with 3% Al addition has the best corrosion resistance in the experimental range.

Key words:Monel alloy; Al content; microstructure and properties