Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Microstructure control of AISI 4135 for optimization of fatigue and fracture performance
Download
index.pdf
Date
2018
Author
Özcan, Burak
Metadata
Show full item record
Item Usage Stats
263
views
447
downloads
Cite This
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
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Delamination of layered materials under impact loading
Dinç, Dinçer; Kalkanlı, Ali; Department of Metallurgical and Materials Engineering (2003)
In this study, a cold worked tool steel and a low carbon steel ( St 37 ), which were joined by brazing, were subjected to impact and shear loading. The end product is used as paper cutting blades in the industry. Effects of different brazing filler metals on the delamination of the blades under impact loading and on the impact toughness of the blades were studied. The target is to achieve higher impact toughness values without delamination. Impact toughness of the steels, joined by Cu, CuNi and BNi brazing ...
Fracture and fatigue crack growth characterization of conventional and head hardened railway rail steels
Motameni Tabatabaei, Ali; Gürbüz, Rıza; Tur, Kazım; Department of Metallurgical and Materials Engineering (2014)
Fatigue crack growth behaviors of rail R260 and rail R350 HT in head, web and foot region of the rail have been investigated. Crack propagation at these three regions were compared. Furthermore, Fracture toughness (KIC) values in the three region of the rail R260 and R350 HT were calculated. Compact shear specimens were machined from the web of the rail in the longitudinal direction to conduct KIIC fracture toughness of the rail R260. A special loading frame manufactured for KIIC testing. Fractographic anal...
Determination of shot peening effect on fatigue behavior of AISI 4140 steel by non-destructive measurement of surface residual stresses
Çalışkan, Salim; Gür, Cemil Hakan; Department of Metallurgical and Materials Engineering (2018)
The fatigue performance of aircraft parts can be improved by inducing compressive residual stresses in the near-surface zone by shot-peening. The depth profile and the magnitude of residual stresses depend on the shot peening parameters. Aircraft industry requires an easy and rapid non-destructive method for determination of residual stress state to verify the achievement of the desired results of shot-peening. This study aims to determine nondestructively the residual stresses at the surface by the Magneti...
Nondestructive monitoring of the variations in microstructure and residual stress in carburized steels
Hızlı, Hüseyin; Gür, Cemil Hakan; Department of Metallurgical and Materials Engineering (2016)
Service life and performance of the case-hardened machine parts are greatly dependent on the residual stress state in the surface layers which directly affects the fatigue behavior. Recently, all industrial sectors have been requested for a fast and non-destructive determination of residual stress. This study aims to monitor the variations in surface residual stress distributions in the carburized 19CrNi5H steels by means of non-destructive and semi-destructive measurement techniques, Magnetic Barkhausen No...
Fatigue behavior of welded API 5L X70 pipeline steel
Turhan, Şermin Özlem; Gürbüz, Rıza; Department of Metallurgical and Materials Engineering (2020)
In this study, fatigue failure behavior of welded X70 pipeline steel was investigated by rotating bar bending fatigue tests performed at room temperature. S-N curves of base metal, weld and heat-affected zone (HAZ) were plotted. Tension tests, hardness measurements and Charpy V notched impact tests were carried out for mechanical characterization. Microstructural examination was conducted by optical microscope and scanning electron microscope (SEM). Fracture surfaces were examined with SEM. In addition to f...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
B. Özcan, “Microstructure control of AISI 4135 for optimization of fatigue and fracture performance,” M.S. - Master of Science, Middle East Technical University, 2018.
