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在扩散制后,MBF-20中间层对Inconel 625超级合金的微结构和腐蚀行为的影响

Alireza Doroudi¹, Hamid Omidvar¹, Ali Dastgheib²

¹Department of Mining and Metallurgical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran 15875-4413, Iran.

Materials (Basel, Switzerland)

|July 29, 2023

概括

扩散结合 (DB) 过程改变了Inconel 625的微观结构,形成化物和固体溶液. 这种修改降低了耐腐蚀性,增加了插孔灵敏度.

科学领域:

材料科学材料科学材料科学
金工业是金工业的一个方面.
腐蚀工程腐蚀工程

背景情况:

在扩散结合 (DB) 中的连接区由同热固化区 (ISZ),超热固化区 (ASZ) 和扩散受影响区 (DAZ) 组成.
了解微结构演变及其对耐腐蚀性的影响对于像Inconel 625这样的先进超级合金至关重要.

研究的目的:

为了研究DB处理后Inconel 625的微结构变化.
评估DB对Inconel 625腐蚀行为的影响.

主要方法:

场发射扫描电子显微镜 (FESEM) 与能量分散X射线光谱仪 (EDS) 进行微观结构分析.
电化学阻抗光谱 (EIS) 和循环潜在动力学偏振测试用于腐蚀评估.

主要成果:

在DAZ和ASZ中形成富含Mo和Cr的化物沉和富含Ni的γ-固体溶液相,这是由于点抑制剂 (MPD) 的相互扩散造成的.
在冷却过程中,ASZ中Ni-Cr-B,Ni-Mo-B,Ni-Si-B和Ni-Si相化合物的发展.
在DAZ中观察到的具有多种形态 (立方体,针状,粒度边界) 的化物化合物.
腐蚀测试显示了减少的被动区域,增加了DB过程后的蚀腐蚀灵敏度.

结论:

在DB过程中,Inconel 625会产生显著的微观结构变化,包括各种化物和固体溶液相的形成.
这些微观结构变化对Inconel 625的耐腐蚀性产生了负面影响,使其更容易受到蚀的侵蚀.

关键词:

在英科内尔625 这是一架MBF-20战斗机.化物沉化物沉腐蚀腐蚀是一种腐蚀.扩散制制是一种制方法.

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