时效处理对超低铁625合金晶间腐蚀性能的影响

IF 1.5 Q4 ELECTROCHEMISTRY

International Journal of Corrosion Pub Date : 2019-01-02 DOI:10.1155/2019/9506401

Zhi-yuan Zhu, Yi Sui, A. Dai, Yuan-fei Cai, Ling-Li Xu, Ze-xin Wang, Hong-Mei Chen, X. Shao, Wei Liu

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引用次数: 4

摘要

利用扫描电子显微镜（SEM）和X射线衍射（XRD）研究了超低铁合金625在750°C下长期时效处理后析出物的微观结构演变。采用ASTM G28A对625合金的晶间腐蚀行为进行了评价。结果表明，析出相γ′′-Ni3Nb主要在晶界和孪晶界析出。γ′′的数量和体积分数随着老化时间的延长而增加。时效200小时后，γ′′转变为δ-Ni3Nb。625合金的耐腐蚀性在时效处理过程中显著降低。625合金抗晶间腐蚀性能的降低归因于析出相和铬贫化区的溶解。625合金时效处理后的质量损失率与析出相的体积有关，可以用Johnson-Mehl-Avrami方程模拟。

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Effect of Aging Treatment on Intergranular Corrosion Properties of Ultra-Low Iron 625 Alloy

The microstructures evolution of precipitations for an ultra-low iron Alloy 625 subjected to long term aging treatment at 750°C was investigated using scanning electron microscope (SEM) and X-ray diffraction (XRD). The intergranular corrosion behaviors of Alloy 625 were evaluated by using ASTM G28A. The result shows that the precipitated phase γ′′-Ni3Nb was mainly precipitated at the grain boundaries and twin boundaries. The number and volume fraction of γ′′ increased with the prolonging of aging time. The transformation of γ′′ to δ-Ni3Nb occurred after aging periods of 200 h. The corrosion resistance of Alloy 625 was significantly reduced during aging treatment. The decrease in intergranular corrosion resistance of Alloy 625 was attributed to the dissolution of precipitated phase and chromium depleted zone. The mass loss rate of Alloy 625 after aging treatment is related to the volume of precipitated phase and can be simulated by Johnson-Mehl-Avrami equation.

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来源期刊

International Journal of Corrosion ELECTROCHEMISTRY-

CiteScore

5.70

自引率

0.00%

发文量

审稿时长

14 weeks