Πλοήγηση ανά Συγγραφέα "Haidemenopoulos, G. N."
Αποτελέσματα 1-20 από 67
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Analysis of heat affected zone in Al1239 and Al2198 laser welds using inverse modeling
(2013)Case study analyses of Al2139 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 ... -
Analysis of heat affected zone in welded aluminum alloys using inverse and direct modeling
(2008)The concept of constructing parameter spaces for process control and the prediction of properties within the heat affected zone (HAZ) of welds using inverse modeling is examined. These parameter spaces can be, in principle, ... -
Austenite stabilization from direct cementite conversion in low-alloy steels
(1996)Transformation induced elasticity (TRIP) effects associated with austenite dispersions in low alloy Fe-Mn-Si steels can be enhanced by austenite stabilisation. Austenite which forms during conventional intercritical annealing ... -
Carburization of high-temperature steels: A simulation-based ranking of carburization resistance
(2015)Carburization is a failure mechanism affecting equipment, such as furnace tubes, operating at high temperatures. Carburization simulations were carried out for the heat-resistant steels referred to the API-530 standard by ... -
Case-Study Inverse Thermal Analyses of Al2139 Laser Welds
(2012)Case study inverse thermal analyses of A12139 laser welds are presented. These analyses employ a numerical methodology that is in terms of analytic and numerical basis functions for inverse thermal analysis of steady state ... -
Case-Study Inverse Thermal Analyses of Al2198 Laser Welds
(2012)In this article, case-study inverse thermal analyses of Al2198 laser welds are presented. These analyses employ a numerical methodology, that is, in terms of analytic and numerical basis functions for inverse thermal ... -
Computational kinetics simulation of the dissolution and coarsening in the HAZ during laser welding of 6061-T6 Al-alloy
(2007)Laser beam welding (LBW) has become common practice in the production lines of several industrial sectors including the electronics, domestic appliances, and automotive industries. The advantages of LBW over conventional ... -
Corrosion of exposed rebars, associated mechanical degradation and correlation with accelerated corrosion tests
(2011)In a large number of steel reinforced concrete buildings in Greece, spalling of the cement has left the steel reinforcement (rebars) exposed to the atmosphere. This has led to corrosion of the exposed rebars, especially ... -
Corrosion-induced hydrogen embrittlement in aluminum alloy 2024
(2006)The present paper focuses on the observed corrosion-induced embrittlement of alloy 2024 and tries to answer the key question on whether the observed embrittlement is attributed to hydrogen uptake and trapping in the material. ... -
Corrosion-induced hydrogen embrittlement in aluminum alloy 2024
(2005)Corrosion is a major concern to the structural integrity of aging aircraft structures. The effect of corrosion on the damage tolerance ability of advanced aluminum alloys calls for consideration of the problems associated ... -
Coupled thermodynamic/kinetic analysis of diffusional transformations during laser hardening and laser welding
(2001)Several important industrial material processes, such as welding and surface treatments with high energy beams, incorporate rapid thermal cycles characterized by high heating/cooling rates and short dwell times. Computational ... -
Diagnostics of the ions produced by laser ablation of TiC and TIB2
(1998)The composition and the kinetics of the plume produced during the pulsed laser deposition of TiC and TiB2 coatings on metal substrates was studied under film growth conditions. Mass analysis of ions of the ejected material ... -
Effect of austenite stability on fatigue performance of TRIP 700 steel
(2013)The role of austenite stability on fatigue performance of low-alloy TRIP steel 700 has been experimentally investigated. Heat treatment process was used to produce varying microstructures, characterized by different initial ... -
Effect of novel paint removal processes on the fatigue behavior of aluminum alloy 2024
(1998)Conventional paint removal processes, based on application of chemicals and abrasion, are becoming inadequate for modern aircraft structures. In addition they are associated with severe environmental problems, mainly due ... -
Effect of prior deformation and heat treatment on the corrosion-induced hydrogen trapping in aluminium alloy 2024
(2014)The nature of the corrosion-induced hydrogen trapping in Al-alloy 2024-T351 was studied by thermal desorption spectroscopy. The microstructure was altered by solution treatment and plastic deformation, prior to corrosion. ... -
Effects of temper condition and corrosion on the fatigue performance of a laser-welded Al-Cu-Mg-Ag (2139) alloy
(2010)The effects of temper condition and corrosion on the fatigue behavior of a laser beam welded Al-Cu-Mg-Ag alloy (2139) have been investigated. Natural aging (T3 temper) and artificial aging (T8 temper) have been applied ... -
Evaluation of creep damage of INCOLOY 800HT pigtails in a refinery steam reformer unit
(2014)Pigtail tubes constitute a critical component of the outlet system of steam reformer units for hydrogen production in refineries. Creep failure of pigtails is a common cause of downtime and potential risk to plant personnel. ... -
Evidence on the corrosion-induced hydrogen embrittlement of the 2024 aluminium alloy
(2005)The present work aims to provide evidence of corrosion-induced hydrogen embrittlement of the aircraft aluminium alloy 2024. An extensive experimental investigation involving metallographic and fractographic analyses as ... -
EXCIMER-LASER USED AS A MATERIALS CHARACTERIZATION TOOL - SULFIDE INCLUSION PRINTING IN STEEL
(1993)An application of the excimer laser in the area of material characterization making use of its ablative ability to perform surface sulphur printing is presented. It is shown that the differential ablative and surface melting ...