초고강도 합금강의 열처리 조건에 따른 부식거동
Corrosion Behaviors of Ultra-high-strength Alloy Steel According to Heat Treatment Conditions
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This study aimed to examine effects of microstructural changes through quenching and tempering (QT) and quenching and partitioning (Q&P) heat treatments on corrosion behavior of ultra-high-strength alloy steel containing Cr, Mo, Ni, and Cu. Electrochemical methods including polarization and impedance spec- troscopy along with microstructural characterization indicated that the conventional partitioning process could lead to formation of retained austenite with larger size in a martensitic matrix, resulting in a higher corrosion rate in saline environments. In contrast, a slightly higher partitioning temperature than marten- site transformation start temperature produced more finely distributed austenite in a bainitic matrix, exhib- iting greater long-term corrosion resistance. This improvement was primarily attributed to the uniform distribution of Ni in the microstructure and the formation of Cr-enriched corrosion product with inhibiting properties in advanced stages of corrosion. These findings provide significant insights into alloying strat- egies to ensure superior long-term corrosion resistance of ultra-high-strength alloy steel in neutral aqueous environments.
Abstract
This study aimed to examine effects of microstructural changes through quenching and tempering (QT) and quenching and partitioning (Q&P) heat treatments on corrosion behavior of ultra-high-strength alloy steel containing Cr, Mo, Ni, and Cu. Electrochemical methods including polarization and impedance spec- troscopy along with microstructural characterization indicated that the conventional partitioning process could lead to formation of retained austenite with larger size in a martensitic matrix, resulting in a higher corrosion rate in saline environments. In contrast, a slightly higher partitioning temperature than marten- site transformation start temperature produced more finely distributed austenite in a bainitic matrix, exhib- iting greater long-term corrosion resistance. This improvement was primarily attributed to the uniform distribution of Ni in the microstructure and the formation of Cr-enriched corrosion product with inhibiting properties in advanced stages of corrosion. These findings provide significant insights into alloying strat- egies to ensure superior long-term corrosion resistance of ultra-high-strength alloy steel in neutral aqueous environments.
참고문헌 (16)
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