Passive Film Properties of Martensitic Steels in Alkaline Environment: Influence of the Prior Austenite Grain Size
Abstract
:1. Introduction
2. Experimental
2.1. Material
2.2. Design of the Microstructure
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- Heat treatment 1 (HT-1)—Samples were heated to the austenitisation temperature of 900 °C, held for 10 min under vacuum and quenched to room temperature.
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- Heat treatment 2 (HT-2)—Higher austenitisation temperature of 1000 °C was chosen. Samples were held at austenitisation temperatures for 4 min. Subsequently, samples were quenched to room temperature.
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- Heat treatment 3 (HT-3)—Samples were heated to the austenitisation temperature of 1000 °C, held for 60 min under vacuum, then quenched to room temperature.
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- Heat Treatment 4 (HT-4)—Samples were heated to 1200 °C and held 48 h in a furnace and slowly cooled to room temperature. Subsequently, the samples were annealed at the austenitisation temperature of 1000 °C for 30 min under vacuum in the dilatometer, then quenched to room temperature.
2.3. Characterization of the Microstructure
2.4. Electrochemical Measurements
2.5. Passive Layer Analysis
3. Results and Discussion
3.1. Microstructure Characterization of the Martensitic Steels
3.2. Passive Layer Analysis
3.3. Electrochemical Investigation
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Elements | Fe | C | Si | Mn | S | Al | Cr | N | Ni | Sn | Ti |
---|---|---|---|---|---|---|---|---|---|---|---|
wt.% | bal. | 0.095 | 0.248 | 1.776 | 0.002 | 0.032 | 0.574 | 0.008 | 0.026 | 0.002 | 0.003 |
Heading | Sample 1 | Sample 2 | Sample 3 | Sample 4 |
---|---|---|---|---|
PAG Size | 5.2 ± 1.5 µm | 28 ± 3 µm | 38 ± 4 µm | 66 ± 6 µm |
Passivation Potential/V | Passive Layer Thickness/nm | |||
---|---|---|---|---|
Sample 1 | Sample 2 | Sample 3 | Sample 4 | |
0.2 | 3.0 ± 0.2 | 2.9 ± 0.1 | 3.1 ± 0.2 | 3.1 ± 0.2 |
0.4 | 3.2 ± 0.2 | 3.3 ± 0.2 | 3.3 ± 0.2 | 3.3 ± 0.2 |
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Yilmaz, A.; Li, X.; Pletincx, S.; Hauffman, T.; Sietsma, J.; Gonzalez-Garcia, Y. Passive Film Properties of Martensitic Steels in Alkaline Environment: Influence of the Prior Austenite Grain Size. Metals 2022, 12, 292. https://doi.org/10.3390/met12020292
Yilmaz A, Li X, Pletincx S, Hauffman T, Sietsma J, Gonzalez-Garcia Y. Passive Film Properties of Martensitic Steels in Alkaline Environment: Influence of the Prior Austenite Grain Size. Metals. 2022; 12(2):292. https://doi.org/10.3390/met12020292
Chicago/Turabian StyleYilmaz, Aytac, Xiaolin Li, Sven Pletincx, Tom Hauffman, Jilt Sietsma, and Yaiza Gonzalez-Garcia. 2022. "Passive Film Properties of Martensitic Steels in Alkaline Environment: Influence of the Prior Austenite Grain Size" Metals 12, no. 2: 292. https://doi.org/10.3390/met12020292