Effect of microstructural modification on damage tolerance of 34CrMo4 shaft steel

Date

2020-06-01

Author

Ozcan, Burak
Gurer, Goksu
Gür, Cemil Hakan

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Overall damage tolerances of the heat-treated 34CrMo4 steels having ferritic-pearlitic, bainitic, and tempered-martensitic microstructures were evaluated based on their threshold stress intensity factor prior to small crack propagation, fatigue strength, and fracture toughness under static loading. Kitagawa-Takahashi diagrams were constructed to determine the limiting size of small crack propagation. The micromechanical effects of carbide morphology and phase distribution on quasi-static and dynamic mechanical properties were also elaborated. Fractographic investigations were carried out on the notched fatigue test specimens to distinguish deterioration and deformation mechanism of the microstructure under reversed cyclic loads. Finally, improvements in the damage tolerance were discussed to present the advantages and disadvantages of each heat treatment procedure to minimize in-service fatigue failures.

Subject Keywords

Mechanical Engineering, General Materials Science, Mechanics of Materials

URI

https://hdl.handle.net/11511/38968

Journal

FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES

DOI

https://doi.org/10.1111/ffe.13194

Collections

Department of Metallurgical and Materials Engineering, Article

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Citation Formats

B. Ozcan, G. Gurer, and C. H. Gür, “Effect of microstructural modification on damage tolerance of 34CrMo4 shaft steel,” FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES, pp. 1214–1225, 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/38968.