Effects of Fine Particle Peening Conditions on the Rotational Bending Fatigue Strength of a Vacuum-Carburized Transformation-Induced Plasticity-Aided Martensitic Steel

The effects of fine particle peening conditions on the rotational bending fatigue strength of a vacuum-carburized transformation-induced plasticity-aided martensitic steel with a chemical composition of 0.20 pct C, 1.49 pct Si, 1.50 pct Mn, 0.99 pct Cr, 0.02 pct Mo, and 0.05 pct Nb were investigated...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2018-05, Vol.49 (5), p.1552-1560
Main Authors: Sugimoto, Koh-ichi, Hojo, Tomohiko, Mizuno, Yuta
Format: Article
Language:English
Subjects:
Automotive parts
Bend strength
Bending fatigue
Carburizing
Characterization and Evaluation of Materials
Chemistry and Materials Science
Chromium
Compressive properties
Crack initiation
Crack propagation
Deformation mechanisms
Fatigue failure
Fatigue limit
Fatigue strength
Fracture mechanics
Heat treating
Martensite
Martensitic stainless steels
Martensitic transformations
Materials Science
Metallic Materials
Metallurgy
Microstructure
Molybdenum
Nanotechnology
Peening
Plastic deformation
Plastic properties
Residual stress
Retained austenite
Strain
Structural Materials
Surfaces and Interfaces
Thin Films
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Summary:The effects of fine particle peening conditions on the rotational bending fatigue strength of a vacuum-carburized transformation-induced plasticity-aided martensitic steel with a chemical composition of 0.20 pct C, 1.49 pct Si, 1.50 pct Mn, 0.99 pct Cr, 0.02 pct Mo, and 0.05 pct Nb were investigated for the fabrication of automotive drivetrain parts. The maximum fatigue limit, resulting from high hardness and compressive residual stress in the surface-hardened layer caused by the severe plastic deformation and the strain-induced martensite transformation of the retained austenite during fine particle peening, was obtained by fine particle peening at an arc height of 0.21 mm (N). The high fatigue limit was also a result of the increased martensite fraction and the active plastic relaxation via the strain-induced martensite transformation during fatigue deformation, as well as preferential crack initiation on the surface or at the subsurface.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-018-4506-6