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首页> 外文期刊>Journal of Materials Engineering and Performance >Corrosion Behavior of Wire Electrical Discharge Machined Surfaces of P91 Steel
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Corrosion Behavior of Wire Electrical Discharge Machined Surfaces of P91 Steel

机译：P91钢丝电气放电加工表面的腐蚀行为

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摘要

The extensive usage of P91 steel in certain reactor components requires its precision fabrication by wire electrical discharge machining (WEDM). The WEDM cut surfaces consist of primarily re-melted and solidified layer (recast layer) of 2-8?μm. The recast layer is a result of fast removal of heat by unaffected metallic substrate and dielectric medium leading to rapid cooling. The WEDM surface is expected to affect the component performance in terms of its corrosion properties. The microstructural changes taking place due to EDM cutting of P91 steel bring about a drastic change in the electrochemical response of surface as compared to that for bulk P91 steel. The surface microstructure is shown to alter the passivation behavior and resistance to localized corrosion. Electrochemical polarization studies were done to evaluate passivation, pitting and intergranular corrosion (IGC) behavior and field emission gun—scanning electron microscopy was used for microstructural characterization of P91 steel surfaces. The passivation behavior for P91 steel WEDM cut surfaces was better than that for diamond polished surface. But pitting corrosion resistance decreased for the P91 steel WEDM surface which is a result of inhomogeneities in the microstructure of recast layer. The IGC resistance though increased due to the decreased grain size in the surface layer.
机译：在某些反应器部件中的P91钢的广泛使用需要通过引线电气放电加工（WEDM）精密制造。 WEDM切割表面主要由2-8Ωμm的主要重新熔化和凝固层（重塑层）组成。重量层是通过未受影响的金属基板和导致快速冷却的介电介质快速去除热量的结果。 WEDM表面预计在其腐蚀性方面会影响组件性能。与散装P91钢相比，由于P91钢的EDM切割而导致的微观结构变化引起了P91钢的电化学响应的剧烈变化。示出了表面微结构，以改变钝化行为和抗局部腐蚀的抵抗力。进行电化学偏振研究以评价钝化，蚀蚀和晶间腐蚀（IGC）行为和场发射枪扫描电子显微镜用于P91钢表面的微观结构表征。 P91钢结构切割表面的钝化行为优于金刚石抛光表面的钝化行为。但是P91钢结构表面的耐腐蚀性降低，其是重量层的微观结构中的不均匀性的结果。由于表面层中的晶粒尺寸减小，IGC电阻虽然增加。

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