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Investigation of functionally graded materials for the repair of bainitic crossing noses using laser directed energy deposition: microstructure and performance.
- Source :
- Virtual & Physical Prototyping; 2023, Vol. 18 Issue 1, p1-20, 20p
- Publication Year :
- 2023
-
Abstract
- In this paper, 20Mn2SiCrMo bainitic crossing noses were repaired by depositing 420SS, Stellite 6, 17-4PH and 18Ni300 alloys on the rail surfaces to form functionally graded materials (FGM) using laser directed energy deposition (L-DED) technology. As a result, only 18Ni300 deposit achieves an excellent strength-toughness combination, which possesses a yield strength of ~1120 MPa together with an impact energy of ~85.05 J, better than those of substrates (~1071 MPa, ~71.34 J). Besides, the wear and rolling contact fatigue (RCF) resistance of 20Mn2SiCrMo/18Ni300 FGM is enhanced to 2.7 and 23.6 times as much as those of substrates. Massive ultrafine nanoprecipitates and a small amount of austenite make 18Ni300 deposit strong enough as well as a certain work-hardenability, ensuring good wear resistance therein; the significant RCF resistance originates from the improved shakedown limit. Therefore, all findings reveal that 18Ni300 is the most promising depositing material for repairing bainitic crossing noses by L-DED. [ABSTRACT FROM AUTHOR]
- Subjects :
- FUNCTIONALLY gradient materials
ROLLING contact fatigue
NOSE
MICROSTRUCTURE
LASERS
Subjects
Details
- Language :
- English
- ISSN :
- 17452759
- Volume :
- 18
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Virtual & Physical Prototyping
- Publication Type :
- Academic Journal
- Accession number :
- 174703698
- Full Text :
- https://doi.org/10.1080/17452759.2023.2231905