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- Title
Effects of energy density on the mechanical properties, residual stress, and fatigue damage of Fe-Cr alloy fabricated by laser-directed energy deposition.
- Authors
Yue, Haitao; Lv, Ning; Guo, Chenguang; Zhao, Lijuan; Jiang, Yihan; Dai, Weibing; Li, Qiang; Zhang, Jianzhuo
- Abstract
Aiming at the problem that AISI4340, a common material for fully mechanized coal mining equipment, is prone to wear failure in harsh working environment. To repair damaged area and improve service performance, the high-strength Fe-Cr alloy coatings having different laser energy densities were fabricated on the AISI4340 by laser-directed energy deposition. The effects of the energy densities on the tensile properties, hardness, residual stress, wear, and fatigue damage were systematically studied. The models of fatigue damage and service life were established and improved, and the prediction accuracy was verified. The results indicated that with the increasing energy density, the tensile strength and Rockwell hardness increased first and then decreased, and the residual stress on the coating surface aggrandized with increasing temperature gradient. When the energy density was 35.01 J/mm2, the wear depth and wear rate were 51.8 μm and 1.91 × 10−2 mm3∙N−1∙mm−1, and the wear resistance was increased by two times compared with the substrate. Considering the effective crack propagation and loading order, the accuracy of the service life models was improved from 65.9% and 23.1% to 14.6% and 6.7%, respectively. Selecting appropriate energy density is beneficial to improve the mechanical properties and decrease the fatigue damage of Fe-Cr alloy coatings.
- Subjects
FATIGUE cracks; RESIDUAL stresses; ENERGY density; MECHANICAL energy; LASER peening; SERVICE life
- Publication
International Journal of Advanced Manufacturing Technology, 2023, Vol 127, Issue 7/8, p3965
- ISSN
0268-3768
- Publication type
Article
- DOI
10.1007/s00170-023-11703-8