Interfacial reactions of duplex stainless steels with molten aluminum

Zhang, Xianman; Li, Xiaomei; Chen, Weiping

doi:10.1002/sia.5760

Cited by 33 publications

(15 citation statements)

References 35 publications

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“…The reason may be ascribed to the following aspects: On one hand, the 3D net-like structure of borides can protect the Fe-Al IMCs from spalling. On the other hand, the IMC layers can serve as barriers to weaken the inter-diffusion rate of molten aluminum and matrix, which leads to the improvement of the corrosion resistance [34,38]. However, when the immersion time is longer than 4 h, the intermetallic thickness of H13 steel is decreased.…”

Section: Resultsmentioning

confidence: 99%

The Influence of A Mo Addition on the Interfacial Morphologies and Corrosion Resistances of Novel Fe-Cr-B Alloys Immersed in Molten Aluminum

Ling

Chen

et al. 2019

Materials

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The influence of a Mo addition on the interfacial morphologies and corrosion resistances of novel Fe-Cr-B alloys in molten aluminum at 750 °C was systematically investigated using scanning electron microscopy, X-ray diffractometer, electron probe microanalysis, and transmission electron microscopy. The results indicated that Mo could not only strengthen the matrix but also facilitate the formation of borides. Furthermore, the microstructures of Mo-rich M2B boride changed from a local eutectic net-like structure to a typical coarse dendritic structure and a blocky hypereutectic structure with increasing Mo addition. This was true of the blocky Mo-rich M2B boride, rod-like Cr-rich M2B boride and the corrosion products, which had a synergistic effect on retarding of the diffusion of molten aluminum. Notably, the corrosion resistance of the Fe-Cr-B-Mo alloy, with an 8.3 wt.% Mo addition, was 3.8 times higher than that of H13 steel.

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Section: Resultsmentioning

confidence: 99%

The Influence of A Mo Addition on the Interfacial Morphologies and Corrosion Resistances of Novel Fe-Cr-B Alloys Immersed in Molten Aluminum

Ling

Chen

et al. 2019

Materials

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“…Indeed, the dissolution process is known to be controlled by diffusion and preferential leaching of Ni, and in a second step of Cr, migrating towards the surface of the material and segregating in sites where a minute amount of oxygen is present. The dissolution of the iron matrix occurs only after Ni and Cr are sufficiently depleted [53,54]. It can also be appreciated that the sample annealed for 360 s/mm possesses one of the poorest content of Ni and Cr within the ferritic phase (Table 5), testifying the key role of these alloying elements in these liquid metal erosion/corrosion phenomena.…”

Section: Discussionmentioning

confidence: 96%

Hot-Dip Aluminizing on AISI F55–UNS S32760 Super Duplex Stainless Steel Properties: Effect of Thermal Treatments

Ciuffini

Barella

Cecca

et al. 2017

Metals

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Abstract:The behavior of super duplex stainless steels AISI F55-UNS S32760 in hot-dip aluminizing process has been studied, investigating the influence of cold working and of different initial microstructures obtained through a preliminary thermal treatment. The microstructural features examined are the secondary austenite precipitation, the static recovery of ferrite and the thermal dissolution of austenite within ferritic matrix. The hot-dip aluminizing temperature has been optimized through sessile drop tests. The treatment has been performed at 1100 • C for 300 s, 900 s and 2700 s. A strong chemical interaction occurs, generating intermetallic compounds at the interface. Molten aluminum interacts exclusively with the ferritic phase due to its much higher diffusivity in this phase coupled with its marked ferrite-stabilizer behavior. Thus, the influence of cold working is not remarkable, since the strains are mainly allocated by austenitic phase. The diffusivity of aluminum increases due to lattice defects thermally generated and, mainly, to influence given by grain boundaries, multiplied by secondary austenite precipitation, which act as short-circuit diffusion paths. Ni and Cr contents in the ferritic matrix have an influence but not highly relevant. Then, the best starting condition of the super duplex stainless steel substrates, to obtain a thick interfacial layer, are the thermal annealing at 1080 • C for 360 s/mm after a solution thermal treatment at 1300 • C for 60 s/mm.

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“…Cr is another important alloying element to improve the corrosion resistance of mild steels. Zhang et al [67] suggested that Cr-rich duplex stainless steel enjoys a better corrosion resistance to liquid aluminum than H13, whose interface between the reaction layer and matrix is much flatter. Its reaction layer is found to consist of outer porous (Fe, Cr)Al3 and inner continuous (Fe, Cr)2Al5.…”

Section: Alloyingmentioning

confidence: 99%