Effect of Solution and Aging Treatment on Corrosion Resistance of HDR Duplex Stainless Steel
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摘要: 为提高船舶用双相不锈钢在海水介质环境下的耐蚀性能,针对HDR双相不锈钢,采用固溶处理和时效处理工艺,通过3D显微镜、维氏硬度计、扫描电子显微镜、能谱仪等分析显微组织、成分、硬度和耐蚀性,研究其在3.5%NaCl溶液中的耐点腐蚀性能,从而确定合适的热处理工艺。结果表明:固溶温度为1 050 ℃～1 150 ℃时,时效处理促进脆性相σ析出,材料硬度提升;固溶温度为1 100 ℃时,HDR双相不锈钢耐点腐蚀性能最好;在1 050 ℃和1 150 ℃固溶温度条件下,时效处理明显削弱了不锈钢的耐蚀性。Abstract: In order to improve the corrosion resistance of marine duplex stainless steel in sea water environment, the HDR duplex stainless steel is treated by the solid solution and aging treatment, and the 3D microscope, Vickers hardness tester, scanning electron microscope, energy spectrometer and other instruments are used to analyze the microstructure, chemical compositions, hardness, and corrosion resistance. The corrosion resistance of the steel in 3.5% NaCl solution is studied, and the most suitable solution temperature determined. The results show that σphase is precipitated when the specimen is aged when the solid solution temperature is between 1 050 and 1 150 ℃ and the hardness of the specimen is promoted. When the solid solution temperature is 1 100 ℃, the specimen exhibits best pitting corrosion resistance. When the solid solution temperature is between 1 050 and 1 150℃, the aging treatment weakens the corrosion resistance of HDR duplex stainless steel.
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