Improved corrosion resistance of AISI 321 steel to molten Al-Si alloy by aluminizing and laser shock peening

Li, Wei; Yu, Changke; Huang, Weiying; Song, Ning; Lei, Yu; Zhu, Shun‐Peng; Chen, Jian; Chen, Anqi; Chen, Hui; Zhang, Shengde; Huang, Ling; Hu, Shanshan

doi:10.1016/j.engfailanal.2023.107144

Cited by 6 publications

(1 citation statement)

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“…Such phenomena indicate that the resistance to C‐F failure of the self‐healing 321 steel is higher than the uncoated and aluminized steels. According to our current work, 38 interestingly, thicker and denser oxide films accompanied by stable NiAl phases would form on the surface layer of aluminized 321 steel, resulting in improvement in its corrosion resistance as compared to the uncoated 321 steel, but it is indicated in Figure 3 that the C‐F properties of aluminized steel are lower than that of uncoated 321 steel. In other words, it is at the expense of C‐F properties that aluminizing improves the corrosion resistance.…”

Section: Resultsmentioning

confidence: 67%

Improved creep‐fatigue and remnant tensile/creep properties of 321 stainless steel by self‐healing coating

Li,

Qin,

Zhu

et al. 2023

Fatigue Fract Eng Mat Struct

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AISI 321 steels used as intake valves in turbines are frequently subjected to creep‐fatigue (C‐F) exposure during service. Improving C‐F resistance and assessing remnant creep/tensile properties are therefore required for their safe service. In this work, the self‐healing coating consisting of Al2O3‐13TiO2 layer, TiC layer, and NiCrAlY layer was prepared for 321 steel. The effects of such self‐healing coating on the C‐F and remnant creep/tensile properties were studied. The results showed that the initial hardening phenomena of the studied steel during C‐F exposure was mainly attributed to the dislocation strengthening and a certain level of carbides precipitation strengthening, while the subsequent softening behaviors were resulted from dynamic recovery and coarsening of carbides. Moreover, as compared to other coatings, the self‐healing coating is able to improve the mechanical properties of steels due to dislocation strengthening, precipitation strengthening, and the self‐healing behavior resulting from the reaction between the TiC layer and oxygen.

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Section: Resultsmentioning

confidence: 67%