Abdunnaser Hamza Fadel

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• Professor in the field of Materials Science and Metallurgical Engineering
• Associate Professor at University of Tripoli

Data required for calculation the static re-crystallization kinetics have been evaluated from laboratory simulations. Series of two hit isothermal tests were conducted on high temperature torsion machine. These tests were conducted on four different temperatures and using inter-pass times between 0.5 and 5s with aim to investigate the influence of...

The aim of this work is focused on nucleation stages with emphasis on the development of intra-granular ferrite morphologies during isothermal austenite transformation in titanium free micro-alloyed steel. Isothermal treatment was carried out in the temperature range 350 to 600οC. These treatments were interrupted at different times between 2 and 1...

This work is focused on nucleation stages during isothermal austenite transformation in two types ofVanadium micro-alloyed steels. Isothermal treatment wascarried out in the temperature range 350 to 600C.Metallographic evaluation using optical and scanningelectron microscopy (SEM) enabled determination of thenucleation curves of isothermally decomp...

This paper presents the experimental results of the tensile, bending, hardness, hydrostatic testing, and microstructural properties of liquefied petroleum gas cylinders from local sources. The burst pressure and fracture sites were also investigated. In addition, know how LPG cylinders are compliant with ISO 4706 requirements as per standard to get...

The aim of this work was to establish a temperature of finish rolling stage of Nb/Ti microalloyed steel containing 0.06 wt.% C, 0.77 wt.% Mn, 0.039 wt.% Nb and 0.015 wt.% Ti, using physical simulation. Samples were subjected to laboratory simulation at a twist plastometer at high temperatures, i.e. between 825 and 950°C. Five pass deformation and i...

LPG cylinders are a type of pressure vessel that requires extreme care to store pressurized gas. This study addresses the determination and prediction of burst pressure (BP) and burst failure location in liquefied petroleum gas (LPG) fuel tanks using both experimental and finite element analysis (FEA) approaches. Experimental burst test studies wer...

The aim of this work was to establish a temperature of finish rolling stage of Nb/Ti micro alloyed steel containing 0.06 wt.% C, 0.77 wt.% Mn, 0.039 wt.% Nb and 0.015 wt.% Ti, using physical simulation. Samples were subjected to laboratory simulation at a twist plastometer at high temperatures, i.e. between 825 and 950 °C. Five pass deformation and...

The demand for economical steels has increased over past years. Steels are expected to have as lean chemistry as possible and to be easier to fabricate. At the same time they are expected to have properties at least equal to steels which are being substituted. These demands have been, at least in part, met by V microalloyed medium carbon forging st...

The main goal of the current paper is focused to investigate and reveal the importance critical transition temperatures. Different techniques were used to reveal the critical transition temperatures. The medium carbon vanadium titanium and titanium free micro alloyed steels tested in this work by isothermal treatment. In order to reveal experimenta...

Liquefied Petroleum Gas (LPG) cylinder is a thin pressure vessel used to meet energy requirements in household applications. Bursting of a pressure vessel is disastrous and many fatal accidents are happened due to pressure vessel bursting. The main goal of the current paper is focused to determine experimentally the burst pressures (BP) and failure...

The influence of vanadium and nitrogen on microstructure and mechanical properties of medium-carbon steels has been studied by means of metallography and mechanical testing.

Isothermal transformation characteristics of a medium carbon Ti-V microalloyed steel were investigated using light microscopy, scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS), and by uniaxial compressive testing. Samples austenitized on 1100 °C were isothermally treated in the range from 350 to 600 °C and subse...

The main goal of the current paper is focused to investigate the effect of isothermal heat treatment temperature and time on microstructure and strength in a medium carbon vanadium titanium free micro alloyed steel. Isothermal heat treatment was carried out in the temperature range 350 to 600 C° at different holding times varying from 2s to 1200s f...

This work is focused on nucleation stages during isothermal austenite decomposition in two medium carbon Vanadium Ti / Ti free micro alloyed steels. Isothermal treatment was carried out in the temperature range 350 to 600 ο C. Metallographic evaluation using optical and scanning electron microscopy (SEM) enabled determination of the nucleation onse...

The aim of the present paper is focused on nucleation onset and development morphologies of acicular ferrite and to evaluate microstructure and mechanical properties during isothermal austenite transformation in titanium free micro-alloyed steel.

The micro-structural changes in type 304L stainless steel post weld solution treated at 1060 ο C for 15 minutes time were studied using streicher screening corrosion test, hardness traverses, repeated solution treatment cycles, delta ferrite measurements and optical microscopic techniques. The aim of the present paper is focused on post weld heat t...

The aim of this work is focused on nucleation stages with emphasis on the development of intra-granular ferrite morphologies during isothermal austenite transformation in titanium free micro-alloyed steel. Isothermal treatment was carried out in the temperature range 350 to 600οC. These treatments were interrupted at different times between 2 and 1...

Data required for calculation the static re-crystallization kinetics have been evaluated from laboratory simulations. Series of two hit isothermal tests were conducted on high temperature torsion machine. These tests were conducted on four different temperatures and using inter-pass times between 0.5 and 5s with aim to investigate the influence of...

Gas and steam power plants in Iraq appeared to be off important options of the electrical energy. Today’s the competition in the market of electricity generation market has been increased the pressure to keep planet generation of power on line whenever required maintenance of steam turbine is of quite importance to insurance the high steam turbines...

Medium carbon V-microalloyed steel continuously cooled from the austenitization temperature at still air, with predominantly acicular ferrite structure, has been investigated by means of four-point bending of notched Griffiths–Owens’s type specimens at liquid nitrogen temperature. Local fracture stress and plastic strain were determined by using fi...

Evaluate microstructure and mechanical properties after austenite decomposition

Aspects of Decomposition of Medium Carbon Micro-alloyed Steel

Cleavage fracture of the medium carbon V-microalloyed steel with structure consisting of acicular ferrite, pearlite and grain boundary ferrite has been investigated by means of four-point bending of the notched samples at -196 °C. It was found that cleavage fracture initiation has not been related to the coarse second phase particles cracking. Calc...

Medium carbon V-microalloyed steel continuously cooled from the austenitization temperature at still air, with predominantly acicular ferrite structure, has been investigated by means of four-point bending of notched Griffiths–Owens’s type specimens at liquid nitrogen temperature. Local fracture stress and plastic strain were determined by using fi...

The aim of this work was to evaluate microstructure and mechanical properties after isothermal decomposition of austenite in V microalloyed steel. Tested steel contained 0.256%C, 0.12%V and 0.229%N. Samples were reheated at 1100C for 10 minutes and then isothermally treated in salt bath at 350, 400 and 450C. Microstructure was revealed using light...

ISOTHERMAL DECOMPOSITION OF MEDIUMCARBON V MICROALLOYED

The demand for economical steels has increased over past years. Steels are expected to have as lean chemistry aspossible and to be easier to fabricate. At the same time they are expected to have properties at least equal to steels whichare being substituted. These demands have been, at least in part, met by V microalloyed medium carbon forging stee...

The aim of this work was to establish the deformation behavior of two vanadium microalloyed medium carbon steels with different contents of carbon and titanium by tensile testing at 77 K. Samples were reheated at 1250 degrees C for 30 min and continuously cooled in still air. Beside acicular ferrite as the dominant morphology in both microstructure...

Austenite Decomposition in Medium Carbon Micro alloyed Steel

The aim of this work was to determine TTT diagram of medium carbon V-N micro-alloyed steel with emphasis on the development of intragranular ferrite morphologies. The isothermal treatment was carried out at 350, 400, 450, 500, 550 and 600 degrees C. These treatments were interrupted at different times in order to analyze the evolution of the micros...

The effect of austenitizing temperature and Cr, Mo and Mn addition on microstructure and mechanical properties of V microalloyed medium carbon steel has been studied by means of metallography and mechanical testing. The addition of Cr, Mn and Mo leads to a decrease in yield strength (YS) by approximate 100 MPa in comparison to the base steel. It is...

The influence of Cr, Mo and Mn on microstructure and mechanical properties ofV-microalloyed medium-carbon steels has been studied by means of metallography andmechanical testing. Cr, Mn and Mo addition promotes the formation of bainitic sheavessuppressing the formation of ferrite-pearlite and acicular ferrite. The influence of Mn issomewhat masked...

This current paper was focused on static recrystallization in Nb/Ti low carbon microallowed steel by means of two hit isothermal torsion with the aim to evaluate the interpass recrystallization data.

Static Recrystallization in Low carbon microalloyed

The main goal of this work was on Activation Energy of Static Recrystallization Determination

The influence of vanadium and nitrogen on microstructure and mechanical properties of medium-carbon steels has been studied by means of metallography and mechanical testing. Vanadium addition to the low nitrogen steel suppresses the formation of ferrite-pearlite following the low reheating temperatures and microstructure consists of bainitic sheave...

The influence of vanadium and nitrogen on microstructure and mechanical properties of medium-carbon steels has been studied by means of metallography and mechanical testing. Vanadium addition to the low nitrogen steel suppresses the formation of ferrite-pearlite following the low reheating temperatures and microstructure consists of bainitic sheave...

The influence of Cr, Mo and Mn on microstructure and mechanical properties of V-microalloyed medium-carbon steels has been studied by means of metallography and mechanical testing. Cr, Mn and Mo addition promotes the formation of bainitic sheaves suppressing the formation of ferrite-pearlite and acicular ferrite. The influence of Mn is somewhat mas...

Data required for calculation the static re-crystallization kinetics have been evaluated from laboratory simulations. In this work series of two hit isothermal tests were conducted for low carbon Nb/Ti microalloyed steel containing (0.074 wt.% C, 1.15 wt.% Mn, 0.035 wt.% Nb and 0.016 wt.% Ti) on high temperature torsion machine. These tests were co...

SOME ASPECTS OF STATIC RECRYSTALLIZATION IN MICROALLOYED STEELS ON HIGH TEMPERATURES

Data required for calculation the static recrystallization kinetics have been evaluated from laboratory simulations. Series of two hit isothermal tests were conducted on high temperature torsion machine. These tests were conducted on series of different temperatures with aim to investigate the influence of thermal activation on static recrystalliza...