Microstructure and phase composition of transition zone between low alloyed steel boiler tube and an austenitic stainless steel weld overlay produced by cold metal transfer method

Rozmus-Górnikowska, M.; Kusiński, J.; Cempura, Grzegorz; Morgiel, J.

doi:10.1016/j.ijpvp.2023.104951

Cited by 5 publications

(2 citation statements)

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“…In order to analyze the mechanism of Mn participating on oxidation, the oxidation rate constant and free energy of several typical oxides were collected as shown in Figure 6 a,b. The oxidation rate constant of Al 2 O 3 oxide layer is more than 2.5 g 2 cm −4 s −1 lower than Cr 2 O 3 oxide layer and the free energy is nearly 300 kJ/mol lower than Cr 2 O 3 oxide layer, which indicates that the Al 2 O 3 oxide film will be formed more slowly as well as be denser and more stable [ 2 , 35 , 39 , 43 , 44 , 45 ]. Figure 6 c analyzed the mechanism of the effect of Mn addition on the oxide film of AFA steel.…”

Section: Antioxidant Propertiesmentioning

confidence: 99%

“…Conventional austenitic stainless steel relies on Cr 2 O 3 oxide film for their antioxidant properties. When applied at temperatures above 650 °C and rich in water vapor, the Cr 2 O 3 oxide film will react with water vapor to form volatile hydroxide and lose its protective effect [ 1 , 2 , 3 , 4 ]. By adding the Al element to austenitic steel, it is possible to form the Al 2 O 3 oxide-based protective film, which is the recently developed Al 2 O 3 -forming austenitic (AFA) steel [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Replacing Ni with Mn on the Microstructure and Properties of Al2O3-Forming Austenitic Stainless Steels: A Review

Chen,

Du,

Zhou

2023

Materials

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Al2O3-forming austenitic steel (AFA steel) is an important candidate material for advanced reactor core components due to its excellent corrosion resistance and high temperature strength. Al is a strong ferrite-forming element. Therefore, it is necessary to increase the Ni content to stabilize austenite. Ni is expensive and highly active, and so increasing the Ni content not only increases the costs but also damages the radiation resistance. Mn is a low-cost austenitic stable element. Its substitution for Ni will not only help to improve the irradiation resistance of austenitic steel, but also reduce the cost. In order to explore the feasibility of Mn-substituted Ni-stabilized austenite in AFA steel, this paper summarized the research progress of Mn-added AFA steels, whilst the research status of traditional Mn-added austenitic steels are also referred to and compared herein. The effect of the addition of Mn on the microstructure and properties of AFA steel was analyzed. The results show that Mn can promote the precipitation of the M23C6 phase and inhibit the precipitation of the B2-NiAl phase and secondary NbC phase. With the increase in Mn content, the strength of AFA steel at room temperature and high temperature decreased slightly, the room temperature elongation increased slightly, while the high temperature elongation and creep resistance decreased obviously. In addition, for austenitic steel free of Al, the addition of Mn will destroy the oxide layer of Cr2O3, which will decrease the oxidation resistance of the steel. But the preliminary study shows that Mn has little effect on the Al2O3 oxide layer. It is worth studying the effect of Mn-substituted Ni on the oxidation resistance of AFA steel. In summary, more efforts are necessary to investigate the optimal Mn content to balance the advantages and disadvantages of introducing Mn instead of Ni.

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