Improvement of notch fatigue properties of ultra-high CM400 maraging steel through shot peening

Shot-peened CM400 maraging steel was used to study the mechanism of enhanced notch fatigue properties of ultra-high strength materials. After shot peening, the specimen surface became rougher, but the transversal machining traces were reduced. The yield strength was slightly improved while the ultim...

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Bibliographic Details
Published in:Journal of materials research 2017-12, Vol.32 (23), p.4424-4432
Main Authors: Duan, Qi-qiang, Wang, Bin, Zhang, Peng, Yang, Ke, Zhang, Zhe-Feng
Format: Article
Language:English
Subjects:
Aging
Applied and Technical Physics
Biomaterials
Crack propagation
Damage tolerance
Deformation mechanisms
Ductility
Expected values
Fatigue failure
Fatigue limit
Grain size
Heat treating
Inorganic Chemistry
Machining
Maraging steels
Materials Engineering
Materials fatigue
Materials research
Materials Science
Metal fatigue
Microstructure
Nanotechnology
Properties (attributes)
Property damage
Scanning electron microscopy
Shear deformation
Shear stress
Shot peening
Steel
Stress-strain curves
Stretching
Tensile strength
Ultimate tensile strength
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Summary:Shot-peened CM400 maraging steel was used to study the mechanism of enhanced notch fatigue properties of ultra-high strength materials. After shot peening, the specimen surface became rougher, but the transversal machining traces were reduced. The yield strength was slightly improved while the ultimate tensile strength and hardness maintained constant; as a result, the fatigue limit was promoted by about 1.5 times. The nucleated sites of the fatigue fracture were partly changed from the surface to subsurface/interior of the specimen. To further analyze the influencing factors of fatigue properties, the fatigue damage process may be resolved to two aspects: (a) fatigue damage rate affected by shear deformation and (b) fatigue damage tolerance controlled by the dilatation fracture process. Considering the stress state near the notch tip, the hydrostatic stress and maximum shear stress are considered for better understanding these two aspects. It is observed that the fatigue damage tolerance increased while the fatigue damage rate decreased after shot peening. Therefore, the notch fatigue properties of CM400 maraging steels can effectively be improved.
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2017.358