The Dual Role of Nb Microalloying on the High‐Cycle Fatigue of 1.0%C–1.5%Cr Bearing Steel
ABSTRACT The high‐cycle tension–compression fatigue property of 1.0%C–1.5Cr% bearing steel with niobium (Nb) content of 180 and 800 ppm was investigated. The results indicated that the fatigue limit for both Nb‐free and 0.018% Nb steel remained at 900 MPa, while 0.080% Nb steel increased to 950 MPa. Furthermore, Nb played a dual role in the high‐cycle fatigue limit. First, it refined the undissolved carbides. In 0.080% Nb steel, the dissolution of rod‐like carbides resulted in a 31% reduction in the size of undissolved carbides compared with Nb‐free steel, and the roundness was increased with carbide aspect ratio decreasing from 1.37 to 1.16. Second, the stress field generated by the tip‐shaped TiN crack source in 0.018% Nb steel exceeded that produced by the spherical oxide inclusions in Nb‐free steel and the ellipsoidal NbC in 0.080% Nb steel, which negatively impacted the fatigue properties of the steel.
Authors
- Hong‐Hui Wu (ORCID: https://orcid.org/0000-0002-1381-2281)
- Guilin Wu (ORCID: https://orcid.org/0000-0002-2723-7724)
- Junheng Gao (ORCID: https://orcid.org/0000-0003-1835-8716)
- Xinping Mao (ORCID: https://orcid.org/0000-0001-8512-2274)
- Shuize Wang
- Chaolei Zhang (ORCID: https://orcid.org/0000-0002-5252-5680)
- Yongjin Wu (ORCID: https://orcid.org/0009-0001-6204-0871)
- Haitao Zhao (ORCID: https://orcid.org/0000-0002-7792-9489)
- Shuaijun Dong
- Wenjun Wang (ORCID: https://orcid.org/0000-0002-6505-7230)
Institutions
- CITIC Group (China) (CN)
- Liaoning Academy of Agricultural Sciences (CN)
- Liaoning Academy of Materials
- University of Science and Technology Beijing (CN)
Publication Details
- Journal
- Fatigue & Fracture of Engineering Materials & Structures
- Published
- 2024-12-30
- DOI
- https://doi.org/10.1111/ffe.14554
- Citations
- 3
- Primary Topic
- Metal Alloys Wear and Properties
- Type
- article
- Field-Weighted Citation Impact
- 0.35
Funders
- National Natural Science Foundation of China