A review on heat treated bearing steels for aerospace applications

Reddy, C. Anil Kumar; Rao, B. Nageswara; Srinivasan, T. N.

doi:10.1016/j.matpr.2022.08.356

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…With the development of aeroengine technology with a high thrust weight ratio, the operation temperature and rotation speed of main bearings constantly increase. [ 1–3 ] Correspondingly, the quality and performance standards of bearing steels need to be continuously improving to promote the development process of aerospace bearing steels with high performance, long service life and high reliability. [ 4–6 ] High‐nitrogen stainless bearing steel (HNSBS), as a representative third‐generation aerospace bearing steel, has gained widespread attention due to its exceptional mechanical properties and corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Cerium Addition Improves Cleanliness and Refines Microstructure of As‐Cast High‐Nitrogen Stainless Bearing Steel

Lu,

Feng,

et al. 2023

steel research int.

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High‐nitrogen stainless bearing steel (HNSBS) is the most representative third‐generation aviation bearing steel, and the cleanliness and microstructure characteristics of bearing steel are crucial to its high performance and long service life. In this work, the effect of cerium addition on the cleanliness and microstructure characteristics of as‐cast HNSBS was systematically studied by combining microstructural characterization and thermodynamic analysis methods. The results show that with increasing Ce content, the cleanliness of steel first improved and then decreased, and Ce2O2S, Ce2O3 and CeN inclusions were generated successively. The Ce content should be controlled to ≈0.012 wt% to ensure that all Al2O3, MgO · Al2O3, and MnS inclusions were modified, and minimize the formation of large‐size Ce‐bearing inclusions. Furthermore, cerium addition refined the dendrite structure due to more nucleation sites for γ‐Fe and the enrichment of Ce in the liquid phase at solidifying front. The finer and more dispersed distribution in precipitates was ascribed to the reduction of growth space and Cr segregation, as well as the increase in effective nucleation sites. These results can offer theoretical guidance for inhibiting the formation of harmful inclusions in high‐nitrogen alloy systems and refining the microstructure of alloy systems containing M23(C, N)6 and M2(C, N) precipitates.

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Section: Introductionmentioning

confidence: 99%