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对2.25Cr1Mo0.25V钢经950、1100和1200℃淬火处理后的显微组织、表面形貌和耐腐蚀性能进行研究。结果表明,2.25Cr1Mo0.25V钢经淬火处理后的显微组织为贝氏体,随淬火温度的升高,显微组织的晶粒尺寸变大,钢中碳化物由粒状分布变为连续的条片状分布。与1100、1200℃淬火处理相比较,2.25Cr1Mo0.25V钢经950℃淬火处理后,在3.5%Na Cl溶液中的腐蚀速率降低,自腐蚀电流密度减小,电荷转移电阻增加,耐腐蚀性能提高。
The microstructure, surface morphology and corrosion resistance of 2.25Cr1Mo0.25V steel after quenching at 950, 1100 and 1200 ℃ were studied. The results show that the microstructure of 2.25Cr1Mo0.25V steel after quenching is bainite. With the increase of quenching temperature, the grain size of the microstructure becomes larger and the carbide in the steel changes from granular distribution to continuous strip Flake distribution. Compared with the quenching treatment at 1100 and 1200 ℃, the corrosion rate of 2.25Cr1Mo0.25V steel quenched at 950 ℃ in 3.5% NaCl solution decreases, the self-corrosion current density decreases, the charge transfer resistance increases, and the corrosion resistance improves .