Cathodic hydrogen embrittlement of pre-stressing steel wires in simulated concrete environments.

Masadeh, Sami


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 ...
Microstructure control of AISI 4135 for optimization of fatigue and fracture performance
Özcan, Burak; Gür, Cemil Hakan; Yurtışık, Koray; Department of Metallurgical and Materials Engineering (2018)
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 ...
Dynamic strain aging of dual phase steels in forming applications
Bayramin, Berkay; Efe, Mert; Department of Metallurgical and Materials Engineering (2017)
Sheet metals are subjected to certain temperatures (25-200oC) and strain rates (1-10 s-1) during forming applications. These thermomechanical conditions may cause dynamic strain aging (DSA) in various grades of steels including dual phase (DP) steels. DSA represent itself as serrations in the stress-strain curves. Two grades of DP steels (DP590 and DP800) were studied systematically at different strain rates (10-3s-1-1s-1) and temperatures (25oC-400oC) to investigate the DSA effects on the mechanical proper...
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...
Polymer/oil relative permeabilities in carbonate reservoirs
Cankara, İlker; Akın, Serhat; Department of Petroleum and Natural Gas Engineering (2005)
In the history of a reservoir, after the period of primary production, about 30 to 40%, of the original oil in place may be produced using a secondary recovery mechanism. Polymer injection, which is classified as a tertiary method, can be applied to the remaining oil in place. In this thesis, oil/water relative permeabilities, effect of polymer injection on end point relative permeabilities and residual oil saturations in heterogeneous carbonate reservoirs were investigated. Numereous core flood experiments...
Citation Formats
S. Masadeh, “Cathodic hydrogen embrittlement of pre-stressing steel wires in simulated concrete environments.,” Ph.D. - Doctoral Program, Middle East Technical University, 1996.