Parcourir par auteur "Haidemenopoulos, G. N."
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Experimental determination of the stability of retained austenite in low alloy TRIP steels
Vasilakos, A. N.; Papamantellos, K.; Haidemenopoulos, G. N.; Bleck, W. (1999)The stability of retained austenite is the most important parameter controlling the transformation plasticity effects in multiphase low alloy TRIP steels. In this work the thermodynamic stability of the retained austenite ... -
Exploitation of the TRIP effect for the development of formable, fracture and fatigue resistant steels for automotive applications
Haidemenopoulos, G. N. (2009)The present paper summarizes recent and on-going work on the exploitation of TRansformation-Induced Plasticity (TRIP) in an effort to develop automotive steels which would possess high-strength combined with high formability ... -
Fatigue failure investigation of pre-corroded and laser-welded Al-Cu-Mg-Ag Alloy with different temper condition
Zervaki, A. D.; Kermanidis, A. T.; Haidemenopoulos, G. N.; Pantelakis, S. G. (2010)The fatigue failure mechanisms of pre-corroded, laser beam welded Al-Cu-Mg-Ag alloy in different temper conditions (T3,T8) have been investigated. Aging influences the corrosion behavior of laser welds. In the T3 temper, ... -
Finite element modelling of TRIP steels
Papatriantafillou, I.; Aravas, N.; Haidemenopoulos, G. N. (2004)A constitutive model that describes the mechanical behaviour of steels exhibiting "Transformation Induced Plasticity" (TRIP) during martensitic transformation is presented. Multiphase TRIP steels are considered as composite ... -
Fracture behavior of bimetallic Al-Cu LBW joints
Haidemenopoulos, G. N.; Zervaki, A. D.; Kamoutsi, H.; Hontzopoulos, E.; Mangana, F. (2013)Pulsed laser spot welding of copper tubing to aluminum sheet is currently used for the construction of solar thermal absorbers. The bimetallic joints should withstand high thermal stresses during the operation of the ... -
Growth of TiB2 and TiC coatings using pulsed laser deposition
Zergioti, I.; Fotakis, C.; Haidemenopoulos, G. N. (1997)Refractory coatings of TiC and TiB2 have been grown by pulsed laser deposition on Si(100) and on X155 steel at various substrate temperatures ranging from 40 degrees C-650 degrees C. A pulsed KrF excimer laser was used ... -
Hydrogen absorption into aluminum alloy 2024-T3 during exfoliation and alternate immersion testing
Haidemenopoulos, G. N.; Hassiotis, N.; Papapolymerou, G.; Bontozoglou, V. (1998)Exfoliation and alternate immersion corrosion were investigated in Al alloy 2024-T3 (UNS A92024) uptake during exposure and to correlate it with corrosion characterization. Characterization involved determination of weight ... -
Hydrogen trapping: Deformation and heat treatment effects in 2024 alloy
Kamoutsi, H.; Haidemenopoulos, G. N.; Bontozoglou, V.; Petroyiannis, P. V.; Pantelakis, Sp G. (2006) -
The influence of salt fog exposure on the fatigue performance of Alclad 6xxx aluminum alloys laser beam welded joints
Kermanidis, A. T.; Zervaki, A. D.; Haidemenopoulos, G. N.; Pantelakis, S. G. (2010)Laser welding is increasingly used for the fabrication of lightweight and cost-effective integral stiffened panels in modern civil aircraft. As these structures age in service, the issue of the effect of corrosion on their ... -
Inverse Thermal Analysis of Heat-Affected Zone in Al2129 and Al2198 Laser Welds
Zervaki, A. D.; Haidemenopoulos, G. N.; Lambrakos, S. G. (2013)Case study analyses of A12139 and Al2198 laser welds are presented. These analyses demonstrate the concept of constructing parameter spaces for prediction of properties within the heat-affected zone (HAZ) of welds using ... -
Investigation of rolling contact fatigue cracks in a grade 900A rail steel of a metro track
Haidemenopoulos, G. N.; Zervaki, A. D.; Terezakis, P.; Tzanis, J.; Giannakopoulos, A. E.; Kotouzas, M. K. (2006)Rolling contact fatigue (RCF) has been of increasing concern in the recent years in respect of the safe operation of high-speed railway track with high traffic intensity. The present paper summarizes the results of the ... -
Investigation on the protective role of local AL cladding against corrosion damage and hydrogen embrittlement of 2024 aluminum alloy specimens
Pantelakis, S. G.; Petroyiannis, P. V.; Haidemenopoulos, G. N. (2004)The present investigation aims to inquire whether Al cladding of 2024 aluminum alloy specimens could provide, additionally to the expected protection against corrosion damage, also a protection against the corrosion induced ... -
Kinetics of Solute Partitioning During Intercritical Annealing of a Medium-Mn Steel
Kamoutsi, H.; Gioti, E.; Haidemenopoulos, G. N.; Cai, Z.; Ding, H. (2015)The evolution of austenite fraction and solute partitioning (Mn, Al, and C) during intercritical annealing was calculated for a medium-Mn steel containing 11 pct Mn. Austenite growth takes place in three stages. The first ... -
Kinetics of strain-induced transformation of dispersed austenite in low-alloy TRIP steels
Haidemenopoulos, G. N.; Aravas, N.; Bellas, I. (2014)A model describing the kinetics of the evolution of martensite volume fraction during the strain-induced transformation of dispersed austenite in low-alloy TRIP steels has been developed. The model is based on the modification ... -
Laser-beam carburizing of low-alloy steels
Katsamas, A. I.; Haidemenopoulos, G. N. (2001)The present study investigated the use of a laser-beam, in order to carburize the surface of DIN 15CrNi6 low-alloy, case-hardening steel. The surface of the material was coated with graphite prior to laser irradiation. Two ... -
Laser-beam surface transformation hardening of hypoeutectoid Ck-60 steel
Katsamas, A. I.; Zervaki, A. D.; Haidemenopoulos, G. N. (1997)A carbon dioxide laser with a power of 1.5 KW was employed for surface hardening of a hypoeutectoid Ck-60 steel. The microstructures and hardness profiles were determined as a function of power density and laser beam travel ... -
Low-alloy TRIP steels: a correlation between mechanical properties and the retained austenite stability
Vasilakos, A. N.; Ohlert, J.; Giasla, K.; Haidemenopoulos, G. N.; Bleck, W. (2002)In recent years the technology of low-alloy TRIP steels has considerably advanced. The mechanical properties are characterised by a combination of high yield strength and high uniform elongation as well as enhanced ... -
Mechanical behavior of 2024 Al alloy specimen subjected to paint stripping by laser radiation and plasma etching
Pantelakis, S. G.; Kermanidis, T. B.; Haidemenopoulos, G. N. (1996)Paint removal is required in a series of aeronautical procedures such as maintenance and repair. Today's paint stripping processes which are based on application of chemicals and abrasion are inadequate for modem aircraft ... -
Modelling of austenite stability in low-alloy triple-phase steels
Haidemenopoulos, G. N.; Vasilakos, A. N. (1996)A model for the stability of dispersed austenite in low alloy triple-phase steels has been developed. The model was based on the dislocation dissociation model for classical heterogeneous martensitic nucleation by considering ... -
Modelling of microsegregation and homogenization of 6061 extrudable Al-alloy
Samaras, S. N.; Haidemenopoulos, G. N. (2007)A simulation of the evolution of the as-cast microstructure during the homogenization heat treatment of A6061 aluminum alloy is presented. The microstructure is dendritic with phase and solute segregation. The alloy ...