Oxidation behavior of ferritic stainless steels in simulated automotive exhaust gas containing 5 vol.% water vapor

Wei, Liangliang; Chen, L.Q.; Ma, Mingyu; Liu, H.L.; Misra, R.D.K.

doi:10.1016/j.matchemphys.2017.11.051

Cited by 37 publications

(5 citation statements)

References 45 publications

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“…It was reported that the addition of W and/or Mo could improve both the creep rupture strength and thermal fatigue resistance of ferritic stainless steel through precipitation and/ or solid-solution strengthening effects [5][6][7]. Meanwhile, it was confirmed that the oxide film became uniform and compact, and the number of defects at the oxide/metal interface was significantly reduced such that it displayed good scale adhesion after Ce addition [8,9]. In order to improve the high-temperature oxidation resistance and thermal mechanical fatigue behavior of ferritic stainless steel, alloying with rare earth element Ce and higher melting-point metals W and/or Mo may be an effective way.…”

Section: Introductionmentioning

confidence: 95%

Influence of Finish Rolling Temperature on Microstructure and Mechanical Properties of a 19Cr1.5Mo0.5 W Ferritic Stainless Steel

Liu

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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A 444-type heat-resistant ferritic stainless steel containing 0.05 wt% Ce (rare earth element) and 2 wt% (Mo + W) was adopted as an experimental material to study the effect of finish rolling temperature on microstructure and texture evolution as well as on mechanical properties and formability. The rolling processes contain hot rolling at two different finish rolling temperatures (860 °C and 770 °C) and annealing, cold rolling and subsequent annealing. It was found that the microstructures after hot rolling and annealing could be refined by lowering finish rolling temperature. The resultant microstructures after cold rolling and annealing were hereditarily refined. Lowering finish rolling temperature can weaken α-fiber texture in hotrolled or cold-rolled ferritic stainless steel strip, while γ-fiber texture in the final product was homogeneously strengthened. Additionally, enhanced mechanical property and formability in terms of strength and average plastic strain ratio could be obtained via decreasing finish rolling temperature.

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Section: Introductionmentioning

confidence: 95%

Influence of Finish Rolling Temperature on Microstructure and Mechanical Properties of a 19Cr1.5Mo0.5 W Ferritic Stainless Steel

Liu

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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“…Furthermore, adding alloying elements such as W can improve the thermal mechanical fatigue performance of medium chromium stainless steel [5]. In the study by Yun et al [6], it was found that the element W can affect the high-temperature oxidation resistance of Fe-22Cr-0.5Mn ferritic stainless steel in the temperature range of 700 to 900 • C. Safikhani et al [7] found that adding elements Ti and W to Fe-22Cr-0.5Mn ferritic stainless steel reduced the oxidation rate of ferritic stainless steel at 900 • C. The study by Wei et al [8] showed that by adding element W to 18Cr ferritic stainless steel, the Laves phase in the oxide film can effectively hinder the internal oxidation process and improve its high-temperature oxidation resistance in the water vapor environment at 950 • C.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Cyclic Oxidation Behavior and Microstructure Evolution of W- and Ce-Containing 18Cr-Mo Type Ferritic Stainless Steel

Zheng,

Feng,

Zhao

et al. 2024

Materials

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Due to the recurrent starting and stopping operations of automobiles during service, their engines’ hot ends are continually subjected to high-temperature cyclic oxidation. Therefore, it is crucial to develop ferritic stainless steels with better high-temperature oxidation resistance. This study focuses on improving the high-temperature cyclic oxidation performance of 18Cr-Mo (444-type) ferritic stainless steel by alloying with high-melting-point metal W and the rare earth element Ce. For this purpose, a high-temperature cyclic oxidation experiment was designed to simulate the actual service environment and investigate the high-temperature cyclic oxidation behavior and microstructure evolution of 444-type ferritic stainless steel alloyed with W and Ce. The oxide structure and composition formed during this process were analyzed and characterized using scanning electron microscopy/energy dispersive spectroscopy (SEM-EDS) and electron probe X-ray micro-analyzer (EPMA), in order to reveal the mechanism of action of W and Ce in the cyclic oxidation process. The results show that 18Cr-Mo ferritic stainless steel alloyed with W and Ce exhibits an excellent resistance to high-temperature cyclic oxidation. The element W can promote the precipitation of the Laves phase between the matrix and the oxide film, and the small-sized Laves phase can inhibit the interfacial diffusion of oxidation reaction elements and prevent the inward growth of the oxide film. The element Ce can refine oxide particles and reduce the thickness of the oxide film. CeO2 particles within the oxide film can serve as nucleation sites for the formation of oxide particles from reactive elements, and they also contribute to pinning the oxide film, thereby enhancing its adhesion.

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“…Due to their good corrosion resistance, good formability, good high-temperature oxidation resistance and lower cost compared to austenitic stainless steels, ferritic stainless steels have been gradually applied in the exhaust system of commercial vehicles [1][2][3][4][5]. In the exhaust system, a selective catalytic reduction (SCR) system used to decompose urea to form ammonia, which reacts with NOx in tail gas, has the worst working environment.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Correlation between Inclusions and High Temperature Urea Corrosion Behavior in Ferritic Stainless Steel

Wang

Zhang

et al. 2021

Metals

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The influence of inclusion size and number density on high-temperature urea corrosion (HTUC) behavior of ferritic stainless steels was investigated in a simulated working environment of selective catalytic reduction (SCR) system in commercial vehicles. There is a positive correlation between the control level of inclusions and the resistance of HTUC. By slightly increasing the content of Nb in ferritic stainless steels, the inclusions, especially TiN, were significantly refined, and thus displayed an improvement in HTUC resistance. The interface between inclusions and the matrix becomes a fast channel for chromium precipitation during high-temperature nitriding induced by the decomposition of urea. Chromium nitrides will precipitate around the inclusions and wrap the inclusions, which will decrease the chromium equivalent of the matrix and reduce the resistance of ferritic stainless steels to HTUC. In addition, the high-temperature oxidation accompanied with thermal fatigue also makes the inclusions more likely to become the crack nucleation source, which can accelerate the material thinning and reduce its service life.

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Oxidation behavior of ferritic stainless steels in simulated automotive exhaust gas containing 5 vol.% water vapor

Cited by 37 publications

References 45 publications

Influence of Finish Rolling Temperature on Microstructure and Mechanical Properties of a 19Cr1.5Mo0.5 W Ferritic Stainless Steel

Influence of Finish Rolling Temperature on Microstructure and Mechanical Properties of a 19Cr1.5Mo0.5 W Ferritic Stainless Steel

High-Temperature Cyclic Oxidation Behavior and Microstructure Evolution of W- and Ce-Containing 18Cr-Mo Type Ferritic Stainless Steel

Investigation on the Correlation between Inclusions and High Temperature Urea Corrosion Behavior in Ferritic Stainless Steel

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