期刊
MATERIALS CHARACTERIZATION
卷 195, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2022.112553
关键词
Austenitic stainless steel; Ultrafine grains; Cr-rich carbide precipitate; Austenite stability; Corrosion behavior
The effect of Cr-rich carbide precipitates on the austenite stability and corrosion behavior of ultrafine-grained 304 stainless steel was investigated. The number and size of Cr-rich carbide precipitates decreased as the annealing temperature increased. The presence of these precipitates reduced the austenite stability and corrosion resistance, leading to the formation of strain-induced martensite and pitting corrosion.
The effect of Cr-rich carbide precipitates on the austenite stability and corrosion behavior of ultrafine-grained 304 stainless steel obtained by cryogenic rolling and subsequent different reversion annealing temperatures were systematically studied. Experimental results demonstrated that the number and size of Cr-rich carbide precipitates gradually decreased as the annealing temperature increased from 700 degrees C to 900 degrees C. The tensile tests revealed that the martensite volume fraction rapidly increased as the true strain increased for the ultrafine-grained sample prepared by annealing at 700 degrees C when compared to 800 degrees C and 900 degrees C. The results of the electrochemical experiments revealed that the corrosion resistance of ultrafine-grained samples increased with annealing temperature from 700 degrees C to 900 degrees C, with annealing at 900 degrees C providing the best pitting corrosion resistance. According to the findings, the Cr-rich carbide precipitates formed during the reversion annealing process reduced the austenite stability and corrosion resistance of ultrafine-grained stainless steels, as evidenced by promoting strain-induced martensite formation and occurrence of pitting corrosion.
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