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Microstructure control of AISI 4135 for optimization of fatigue and fracture performance
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Date
2018
Author
Özcan, Burak
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Avoiding early fatigue failure of the AISI 4135 steel shafts in trains is an important task. This study aims to improve the damage tolerance of AISI 4135 steel by modifying its microstructure via heat treatment. The overall effect of various heat treatment procedures on the damage tolerance was analyzed by considering the threshold stress intensity factor and fatigue strength. Detailed investigations on the mechanical properties were performed, and fracture surfaces were investigated. The resistance of the steel specimens having ferritic-pearlitic, bainitic and tempered-martensitic microstructure against initiation and propagation of the small flaws were demonstrated by constructing Kitagawa-Takahashi diagrams. The results showed that ferritic-pearlitic AISI 4135 axles that are being utilized in service is inappropriate, and the damage tolerance of these axles regarding the fatigue crack propagation threshold can be remarkably improved via isothermal or quench-temper applications.
Subject Keywords
Steel
,
Steel
,
Steel
,
Steel
URI
http://etd.lib.metu.edu.tr/upload/12622155/index.pdf
https://hdl.handle.net/11511/27339
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Graduate School of Natural and Applied Sciences, Thesis
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B. Özcan, “Microstructure control of AISI 4135 for optimization of fatigue and fracture performance,” M.S. - Master of Science, Middle East Technical University, 2018.
