abboub amar | Mascara Mustafa Stambouli (original) (raw)

Papers by abboub amar

Research paper thumbnail of Mechanical behaviour of austenitic stainless steel loaded in the aqueous solution of H2SO4 during tensile testing

VOJNOTEHNIČKI GLASNIK / MILITARY TECHNICAL COURIER, 2024

Introduction/purpose: Stainless steels have excellent corrosion resistance and adequate mechanica... more Introduction/purpose: Stainless steels have excellent corrosion resistance and adequate mechanical properties. However, their use in aggressively hydrogenated environments in the energy industry causes a loss of ductility. This work studied the effect of hydrogen on the mechanical behavior of the DINX15CrNiSi25.21/AISI310 austenitic stainless steel loaded in an aqueous solution of purely sulfuric acid H2SO4 at 1N at room temperature during tensile testing. Methods: Experimental characterization techniques are applied to standardised machining-manufactured tensile specimens which underwent a series of heat treatments ranging from quenching at 1050°C for 35 minutes to tempering at 680°C for 30 minutes. This is accompanied by a succession of immersions of these samples by cryogenic quenching cycles at-196°C for a duration of 1 hour. The hydrogen was electrolytically loaded in a Pyrex glass cell for various loading times, ranging from 1h00 to 15h00, with a step of 2h00. Results: The results showed a reduction in mechanical properties and plasticity. The electrochemical method confirmed the material's sensitivity to hydrogen embrittlement, calculating the embrittlement criterion EI (%). This method indicates a rapid increase in values depending on hydrogen loading times, with a maximum value of 41.60%. Conclusion: The study highlights the negative impact of hydrogen on the mechanical properties of AISI310 stainless steel, emphasising the need for reduced hydrogen exposure in steel applications.

Research paper thumbnail of Experimental investigation of hydrogen embrittlement to stainless steel charged by sulfuric acid at ±20°C

Journal of International Society for Science and Engineering (JISSE), 2023

The penetration and trapping of hydrogen within metallic materials can lead to damage and degrada... more The penetration and trapping of hydrogen within metallic materials can lead to damage and degradation of mechanical properties during the operating phase. Much more in the energy, chemical, and petrochemical industries sectors, these types of metallic materials, widely used in aggressive hydrogenated environments, undergo degradation. In this present experimental work, we studied the influence of charged hydrogen on the mechanical behaviour in tensile of a highly alloyed austenitic stainless steel of the commercial grade AISI304L was prepared in the form of standardized cylindrical type specimens of 8mm diameter were manufactured by machining. Their hydrogen loading was carried out electrolytically according to industrial conditions adopted at different pre-charging times in hours in a Pyrex glass enclosure containing an aqueous solution of purely sulfuric acid H2SO4 at 0.1N and equipped with two electrodes, one cathode connected to the test specimen, an unattackable platinum anode with a chosen current density equal to 100mA/Cm2. The mechanical fracture tests were carried out using an instrumented tensile machine with a maximum load of 400KN and a nominal displacement speed of 23mm/min. The microscopic analyses of the samples were carried out by different techniques: optical microscopy, x-ray diffraction, and scanning electron microscopy, the results obtained in agreement with
the work of the different authors who showed loss of ductility due to martensitic transformation of austenite caused by deformation and sensitivity by diffusion and hydrogen trapping.

Research paper thumbnail of The Effect of cryogenic heat treatments on the mechanical behavior of hydrogen filled steels

International Journal of Advanced Sicentific Research and Innovation (IJASRI) Egypt., 2023

The noble interest of this article is the study, the effect of heat treatments at low temperature... more The noble interest of this article is the study, the effect of heat treatments at low temperatures at -196°C and structure on the mechanical behaviour of steels cathodically charged with hydrogen. The standardized tensile test specimens undergo characterization techniques by mechanical test, hardness, tensile. Underwent austenization heat treatments for 35minutes at 1050°C following a rapid water quench, following by a tempering for 30 minutes at 680°C, after having a cryogenic quenching for 30minutes by the liquid nitrogen (N2) gaz at -196°C in immersion succession ranging from 20cycles time. A cathodic loading was in a pyrex cell to be filled with an aqueous solution of sulfuric acid H2SO4 at 0.05M for different loading times from 1hour to 8hours with a step of 1hour. The application of these methods and technicals aims to improve the mechanical properties of these respect to the embrittlement mechanism. The results of the different mechanical properties given in the form of experimental curves to be noted after the mechanical fracture test by tensile at ±20°C temperature using an instrumented tensile machining reference : Frank GMBH, with industrial conditions, the maximum load is constant at 400KN and nominal speed deplacement at (έ=23.0mm/min).

Research paper thumbnail of Mechanical behaviour of austenitic stainless steel loaded in the aqueous solution of H2SO4 during tensile testing

VOJNOTEHNIČKI GLASNIK / MILITARY TECHNICAL COURIER, 2024

Introduction/purpose: Stainless steels have excellent corrosion resistance and adequate mechanica... more Introduction/purpose: Stainless steels have excellent corrosion resistance and adequate mechanical properties. However, their use in aggressively hydrogenated environments in the energy industry causes a loss of ductility. This work studied the effect of hydrogen on the mechanical behavior of the DINX15CrNiSi25.21/AISI310 austenitic stainless steel loaded in an aqueous solution of purely sulfuric acid H2SO4 at 1N at room temperature during tensile testing. Methods: Experimental characterization techniques are applied to standardised machining-manufactured tensile specimens which underwent a series of heat treatments ranging from quenching at 1050°C for 35 minutes to tempering at 680°C for 30 minutes. This is accompanied by a succession of immersions of these samples by cryogenic quenching cycles at-196°C for a duration of 1 hour. The hydrogen was electrolytically loaded in a Pyrex glass cell for various loading times, ranging from 1h00 to 15h00, with a step of 2h00. Results: The results showed a reduction in mechanical properties and plasticity. The electrochemical method confirmed the material's sensitivity to hydrogen embrittlement, calculating the embrittlement criterion EI (%). This method indicates a rapid increase in values depending on hydrogen loading times, with a maximum value of 41.60%. Conclusion: The study highlights the negative impact of hydrogen on the mechanical properties of AISI310 stainless steel, emphasising the need for reduced hydrogen exposure in steel applications.

Research paper thumbnail of Experimental investigation of hydrogen embrittlement to stainless steel charged by sulfuric acid at ±20°C

Journal of International Society for Science and Engineering (JISSE), 2023

The penetration and trapping of hydrogen within metallic materials can lead to damage and degrada... more The penetration and trapping of hydrogen within metallic materials can lead to damage and degradation of mechanical properties during the operating phase. Much more in the energy, chemical, and petrochemical industries sectors, these types of metallic materials, widely used in aggressive hydrogenated environments, undergo degradation. In this present experimental work, we studied the influence of charged hydrogen on the mechanical behaviour in tensile of a highly alloyed austenitic stainless steel of the commercial grade AISI304L was prepared in the form of standardized cylindrical type specimens of 8mm diameter were manufactured by machining. Their hydrogen loading was carried out electrolytically according to industrial conditions adopted at different pre-charging times in hours in a Pyrex glass enclosure containing an aqueous solution of purely sulfuric acid H2SO4 at 0.1N and equipped with two electrodes, one cathode connected to the test specimen, an unattackable platinum anode with a chosen current density equal to 100mA/Cm2. The mechanical fracture tests were carried out using an instrumented tensile machine with a maximum load of 400KN and a nominal displacement speed of 23mm/min. The microscopic analyses of the samples were carried out by different techniques: optical microscopy, x-ray diffraction, and scanning electron microscopy, the results obtained in agreement with
the work of the different authors who showed loss of ductility due to martensitic transformation of austenite caused by deformation and sensitivity by diffusion and hydrogen trapping.

Research paper thumbnail of The Effect of cryogenic heat treatments on the mechanical behavior of hydrogen filled steels

International Journal of Advanced Sicentific Research and Innovation (IJASRI) Egypt., 2023

The noble interest of this article is the study, the effect of heat treatments at low temperature... more The noble interest of this article is the study, the effect of heat treatments at low temperatures at -196°C and structure on the mechanical behaviour of steels cathodically charged with hydrogen. The standardized tensile test specimens undergo characterization techniques by mechanical test, hardness, tensile. Underwent austenization heat treatments for 35minutes at 1050°C following a rapid water quench, following by a tempering for 30 minutes at 680°C, after having a cryogenic quenching for 30minutes by the liquid nitrogen (N2) gaz at -196°C in immersion succession ranging from 20cycles time. A cathodic loading was in a pyrex cell to be filled with an aqueous solution of sulfuric acid H2SO4 at 0.05M for different loading times from 1hour to 8hours with a step of 1hour. The application of these methods and technicals aims to improve the mechanical properties of these respect to the embrittlement mechanism. The results of the different mechanical properties given in the form of experimental curves to be noted after the mechanical fracture test by tensile at ±20°C temperature using an instrumented tensile machining reference : Frank GMBH, with industrial conditions, the maximum load is constant at 400KN and nominal speed deplacement at (έ=23.0mm/min).