The current study is aimed to use Polysorbate 80 as surfactant for investigating the effectiveness of permeate TBA on the Polyether Ether Ketone (PEEK) anti–cancer protective membrane and the effect of loading DNA/RNA–CdO sandwiched complex on hydrophilicity and anti–cancer properties. The results showed decreasing surface pore size from 227 to 176 and increasing porosity from 101 to 111 with loading DNA/RNA–CdO sandwiched complex, and the permeate of anti–cancer protective membrane increased from 80 to 220 (L/m2.hr.bar) with loading DNA/RNA–CdO sandwiched complex. In addition, the results of current study showed that by increasing DNA/RNA–CdO sandwiched complex nanohybrides to 0.09Wt% to polymer matrix contact angle decreased from 84.4 to 23 degree. Moreover, the results of current study showed that by increasing DNA/RNA–CdO sandwiched complex nanohybrides to 0.09Wt% to hydrophilicity of anti–cancer protective membranes increased. All of the above results mentioned fouling of hybride anti–cancer protective membrane decreased than usual form. Therefore, hybride anti–cancer protective membranes of (DNA/RNA–CdO sandwiched complex) with the help of Polysorbate 80 as surfactant may be considered as a suitable anti�?cancer protective membrane for treatment of TBA.
{"title":"Removal of Cancer Cells Using Thin Layers of Cadmium Oxide (CdO)�?DNA/RNA Sandwiched Complex Composite Plasmonic Nanostructure under Synchrotron Radiation","authors":"A. Heidari","doi":"10.30564/JMMR.V4I1.3362","DOIUrl":"https://doi.org/10.30564/JMMR.V4I1.3362","url":null,"abstract":"The current study is aimed to use Polysorbate 80 as surfactant for investigating the effectiveness of permeate TBA on the Polyether Ether Ketone (PEEK) anti–cancer protective membrane and the effect of loading DNA/RNA–CdO sandwiched complex on hydrophilicity and anti–cancer properties. The results showed decreasing surface pore size from 227 to 176 and increasing porosity from 101 to 111 with loading DNA/RNA–CdO sandwiched complex, and the permeate of anti–cancer protective membrane increased from 80 to 220 (L/m2.hr.bar) with loading DNA/RNA–CdO sandwiched complex. In addition, the results of current study showed that by increasing DNA/RNA–CdO sandwiched complex nanohybrides to 0.09Wt% to polymer matrix contact angle decreased from 84.4 to 23 degree. Moreover, the results of current study showed that by increasing DNA/RNA–CdO sandwiched complex nanohybrides to 0.09Wt% to hydrophilicity of anti–cancer protective membranes increased. All of the above results mentioned fouling of hybride anti–cancer protective membrane decreased than usual form. Therefore, hybride anti–cancer protective membranes of (DNA/RNA–CdO sandwiched complex) with the help of Polysorbate 80 as surfactant may be considered as a suitable anti�?cancer protective membrane for treatment of TBA.","PeriodicalId":232294,"journal":{"name":"Journal of Metallic Material Research","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115871997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Faraj, Kareima A. Abdelghani A. A. Idress, D. Ibrahim
The chemical technique was used to investigate the inhibition and adsorption properties of L-proline for steel corrosion (weight loss method). As the concentration of L-proline increased, the inhibition efficiency increased, but decreased as the temperature increased, according to the findings. The inhibitor’s adsorption to the steel surface has been shown to be random, involving both electrostatic and chemisorptions. The Temkin adsorption isotherm governs the adsorption of L-proline to the steel surface. Thermodynamic parameters have been determined in some cases.
{"title":"L-Proline as a Green Corrosion Inhibitor in Aqueous Solutions for Carbon Steel","authors":"Faraj, Kareima A. Abdelghani A. A. Idress, D. Ibrahim","doi":"10.30564/JMMR.V4I1.3114","DOIUrl":"https://doi.org/10.30564/JMMR.V4I1.3114","url":null,"abstract":"The chemical technique was used to investigate the inhibition and adsorption properties of L-proline for steel corrosion (weight loss method). As the concentration of L-proline increased, the inhibition efficiency increased, but decreased as the temperature increased, according to the findings. The inhibitor’s adsorption to the steel surface has been shown to be random, involving both electrostatic and chemisorptions. The Temkin adsorption isotherm governs the adsorption of L-proline to the steel surface. Thermodynamic parameters have been determined in some cases.","PeriodicalId":232294,"journal":{"name":"Journal of Metallic Material Research","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127172757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Bulk raw materials handling plant and sintering plant preparatory plants are established to receive, blend, stockpile, prepare and supply specified grades of raw materials for smooth operations of iron making plant (Blast furnace), steel making plant (Basic oxygen converter) and lime Plant(calcinations plant). The study discusses bulk raw materials handling and some general problem of scientific analysis and documentation of basic equipment details, stockyard facilities, bulk materials transport systems and sinter processes, for the general knowledge and operational procedures of these plant for effective and efficient operational processes for optical results. Iron ore concentrate supplied from the mines to some extent fluctuate in their chemical composition as a result of the nature of the deposit with various factors controlling beneficiation processes and addition of metal-bearing materials collected as a waste product from the Rolling Mills, Blast Furnace and Sinter Plant which must be recycled through Iron ore concentrate stockyard. The part of the sinter mixture is melted at a temperature about 1300-1480 ° C and a sequence of reactions shaping the sinter cake to be loaded into the blast furnace to produce iron from a pig.
{"title":"Bulk Raw Materials Handling and Blending Techniques of Sinter Plant: A Case Study of Ajaokuta Steel Company Limited, Kogi State, Nigeria","authors":"C. Ocheri","doi":"10.30564/jmmr.v3i2.2409","DOIUrl":"https://doi.org/10.30564/jmmr.v3i2.2409","url":null,"abstract":"Bulk raw materials handling plant and sintering plant preparatory plants are established to receive, blend, stockpile, prepare and supply specified grades of raw materials for smooth operations of iron making plant (Blast furnace), steel making plant (Basic oxygen converter) and lime Plant(calcinations plant). The study discusses bulk raw materials handling and some general problem of scientific analysis and documentation of basic equipment details, stockyard facilities, bulk materials transport systems and sinter processes, for the general knowledge and operational procedures of these plant for effective and efficient operational processes for optical results. Iron ore concentrate supplied from the mines to some extent fluctuate in their chemical composition as a result of the nature of the deposit with various factors controlling beneficiation processes and addition of metal-bearing materials collected as a waste product from the Rolling Mills, Blast Furnace and Sinter Plant which must be recycled through Iron ore concentrate stockyard. The part of the sinter mixture is melted at a temperature about 1300-1480 ° C and a sequence of reactions shaping the sinter cake to be loaded into the blast furnace to produce iron from a pig. ","PeriodicalId":232294,"journal":{"name":"Journal of Metallic Material Research","volume":"227 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116202370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Shuaibov, A. Minya, A. Malinina, A. Malinin, Z. Gomoki, V. V. Danylo, Yuriy Bilak
The results of the study of oscillograms of voltage, current, pulsed electric power and energy input into the plasma of an overstressed nanosecond discharge between aluminum electrodes in argon and mixtures of nitrogen with oxygen (100-1) at pressures in the range of 13.3-103.3 kPa are presented, the emission plasma spectra are studied. It is shown that in mixtures of nitrogen with oxygen at atmospheric pressure, nanoparticles of aluminum oxide (Al2O3) are formed, the luminescence of which manifests itself in the spectral range of 200-600 nm and which is associated with the formation of F-, F + - centers and more complex aggregate formations based on oxygen vacancies. Calculations of the electron-kinetic coefficients of plasma, transport characteristics, such as mean electron energies in the range 5.116-13.41 eV, are given. The electron concentration was 1.6 ∙ 1020 m-3 - 1.1 ∙ 1020 m-3 at a current density of 5.1 ∙ 106 A / m2 and l. 02 ∙ 107 A / m2 on the surface of the electrode of the radiation source (0.196 · 10-4 m2). Also drift velocities, temperatures and concentrations of electrons, specific losses of the discharge power for elastic and inelastic processes of collisions of electrons per unit of the total concentration of the mixture from the reduced electric field strength (E / N) for a mixture of aluminum, nitrogen, oxygen, rate constants of collisions of electrons with aluminum atoms on the E / N parameter in plasma on a mixture of aluminum vapor, oxygen and nitrogen = 30: 1000: 100000 Pa at a total mixture pressure of P = 101030 Pa are given.
{"title":"Study of the Formation Conditions of Aluminum Oxide Nanoparticles in An Overstressed Nanosecond Discharge between Aluminum Electrodes in A Mixture of Nitrogen and Oxygen","authors":"A. Shuaibov, A. Minya, A. Malinina, A. Malinin, Z. Gomoki, V. V. Danylo, Yuriy Bilak","doi":"10.30564/jmmr.v3i2.2441","DOIUrl":"https://doi.org/10.30564/jmmr.v3i2.2441","url":null,"abstract":"The results of the study of oscillograms of voltage, current, pulsed electric power and energy input into the plasma of an overstressed nanosecond discharge between aluminum electrodes in argon and mixtures of nitrogen with oxygen (100-1) at pressures in the range of 13.3-103.3 kPa are presented, the emission plasma spectra are studied. It is shown that in mixtures of nitrogen with oxygen at atmospheric pressure, nanoparticles of aluminum oxide (Al2O3) are formed, the luminescence of which manifests itself in the spectral range of 200-600 nm and which is associated with the formation of F-, F + - centers and more complex aggregate formations based on oxygen vacancies. Calculations of the electron-kinetic coefficients of plasma, transport characteristics, such as mean electron energies in the range 5.116-13.41 eV, are given. The electron concentration was 1.6 ∙ 1020 m-3 - 1.1 ∙ 1020 m-3 at a current density of 5.1 ∙ 106 A / m2 and l. 02 ∙ 107 A / m2 on the surface of the electrode of the radiation source (0.196 · 10-4 m2). Also drift velocities, temperatures and concentrations of electrons, specific losses of the discharge power for elastic and inelastic processes of collisions of electrons per unit of the total concentration of the mixture from the reduced electric field strength (E / N) for a mixture of aluminum, nitrogen, oxygen, rate constants of collisions of electrons with aluminum atoms on the E / N parameter in plasma on a mixture of aluminum vapor, oxygen and nitrogen = 30: 1000: 100000 Pa at a total mixture pressure of P = 101030 Pa are given.","PeriodicalId":232294,"journal":{"name":"Journal of Metallic Material Research","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129107645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Chloride ions interact with aluminium in marine atmosphere to form corrosion cell. Due to this corrosion reaction occurs on their surface, aluminium is oxidized into Al3+. The corrosion reaction accelerates deterioration in metal and it produces galvanic, pitting, stress, crevice, intergranular corrosion. Chloride ions decrease internal and external strength of aluminium metal. It is a very important metal so used in different appliances for e.g. road, water, air transports, housing, railways and other fields. Nanocoating and electrospray techniques used to check the corrosion of aluminium metal. For nanocoating and electrospray materials applied tetrahydro-dibenzo[a,d][7]annulene-5,11-dihydrazone and MgO. Both materials formed composite barrier and developed a passive surface for Cl- ions. This barrier reduced the corrosion rate of aluminium. Nozzle spray and chemical vapour deposition technique used for coating process. The corrosion rate of metal was determined by gravimetric method. Corrosion potential and current density were calculated by potentiostat. The composite barrier formation was confirmed by activation energy, heat of adsorption, free energy, enthalpy and entropy. These thermal parameters were obtained by Arrhenius equation, Langmuir isotherm and Transition state equation. The adsorption of tetrahydro-dibenzo[a,d][7]annulene-5,11-dihydrazone and MgO electrospray on aluminium surface was depicted by Langmuir, Frundlich and Temkin isotherm. The results of surface coverage area and coating efficiency were noticed that both materials were mitigated the corrosion rate of aluminium in chloride ions environment.
{"title":"Tetrahydro-dibenzo[a,d][7]annulene-5,11-dihydrazone and Magnesium oxide Used to Control the Corrosion of Aluminium in Chloride ions Environment","authors":"R. Singh, J. Prakash, Dharmendar Kumar","doi":"10.30564/jmmr.v3i2.2403","DOIUrl":"https://doi.org/10.30564/jmmr.v3i2.2403","url":null,"abstract":"Chloride ions interact with aluminium in marine atmosphere to form corrosion cell. Due to this corrosion reaction occurs on their surface, aluminium is oxidized into Al3+. The corrosion reaction accelerates deterioration in metal and it produces galvanic, pitting, stress, crevice, intergranular corrosion. Chloride ions decrease internal and external strength of aluminium metal. It is a very important metal so used in different appliances for e.g. road, water, air transports, housing, railways and other fields. Nanocoating and electrospray techniques used to check the corrosion of aluminium metal. For nanocoating and electrospray materials applied tetrahydro-dibenzo[a,d][7]annulene-5,11-dihydrazone and MgO. Both materials formed composite barrier and developed a passive surface for Cl- ions. This barrier reduced the corrosion rate of aluminium. Nozzle spray and chemical vapour deposition technique used for coating process. The corrosion rate of metal was determined by gravimetric method. Corrosion potential and current density were calculated by potentiostat. The composite barrier formation was confirmed by activation energy, heat of adsorption, free energy, enthalpy and entropy. These thermal parameters were obtained by Arrhenius equation, Langmuir isotherm and Transition state equation. The adsorption of tetrahydro-dibenzo[a,d][7]annulene-5,11-dihydrazone and MgO electrospray on aluminium surface was depicted by Langmuir, Frundlich and Temkin isotherm. The results of surface coverage area and coating efficiency were noticed that both materials were mitigated the corrosion rate of aluminium in chloride ions environment.","PeriodicalId":232294,"journal":{"name":"Journal of Metallic Material Research","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128971970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, the forming behaviour of dissimilar welded blanks was studied. Welded blanks were prepared with friction stir welding processwith different types of tool pin profiles. Welded blanks were developed with fixedfriction stir welding process parameters by varying the tool pin profiles. The forming behaviour of welded blanks were analyzed with the limiting dome height test in biaxial stretch forming condition.The results reveal that the formability of welded joints are made with the square pin tool exhibited a better formabilitybehaviour when compared with other profiled tools, this is due to sufficient amount heat generation and high static volume to dynamic volume ratio.
{"title":"Behaviour of Friction Stir Dissimilar Welded Blanks and The Role of Different Tool PIN Profiles","authors":"Bhanodaya Kiran Babu Nadikudi","doi":"10.30564/jmmr.v2i2.942","DOIUrl":"https://doi.org/10.30564/jmmr.v2i2.942","url":null,"abstract":"In this study, the forming behaviour of dissimilar welded blanks was studied. Welded blanks were prepared with friction stir welding processwith different types of tool pin profiles. Welded blanks were developed with fixedfriction stir welding process parameters by varying the tool pin profiles. The forming behaviour of welded blanks were analyzed with the limiting dome height test in biaxial stretch forming condition.The results reveal that the formability of welded joints are made with the square pin tool exhibited a better formabilitybehaviour when compared with other profiled tools, this is due to sufficient amount heat generation and high static volume to dynamic volume ratio.","PeriodicalId":232294,"journal":{"name":"Journal of Metallic Material Research","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121776500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Titanium powder was rapidly solidified by using shock-wave consolidation technique. The critical parameters were controlled by the instrumented detonics and pin- oscillography. The compacted specimens were investigated for crystal structure and micro structural strengthening by using standard diagnostic techniques. The density of the final product was found to be more than 96% of the theoretical value. X-ray diffraction pattern reveals intact crystalline structure without the presence of any undesired phases. The particle size reduction indicated by XRD was supported by laser diffraction based particle size analyzer. The crystalline structure of the compacted specimen remained intact. No impurity or phase of any other kind was detected. There is no segregation within the compacts. Results from energy dispersive spectroscopy ruled out the possibility of any segregation within the compacts. This high-quenching during rapid solidification minimize chemical segregation and formation of massive phases and hence ensures a homogeneous fine-grained structure. Scanning electron microscopy showed crack-free, voids-free, melt-free, fracture-less compacts of titanium with a unidirectional dendrite orientation without any grain-growth. The particle size of the titanium powder calculated from SEM image found to be ~30μm that supports the earlier observation. Shock-wave consolidation being transient in nature, owing to its short processing time, controlled parameters and high quench-rates proven to be a very helpful technique for obtaining a stable structural and microstrutural products. Hence, SWC technique helped in forming the uniform melt-free, crack-free, voids-free compacts of titanium powder.
{"title":"Study of Shock-processed Titanium Powder in View the Crystal Structure and Microstructure Dimension","authors":"I. Ahmad","doi":"10.30564/jmmr.v2i2.1041","DOIUrl":"https://doi.org/10.30564/jmmr.v2i2.1041","url":null,"abstract":"Titanium powder was rapidly solidified by using shock-wave consolidation technique. The critical parameters were controlled by the instrumented detonics and pin- oscillography. The compacted specimens were investigated for crystal structure and micro structural strengthening by using standard diagnostic techniques. The density of the final product was found to be more than 96% of the theoretical value. X-ray diffraction pattern reveals intact crystalline structure without the presence of any undesired phases. The particle size reduction indicated by XRD was supported by laser diffraction based particle size analyzer. The crystalline structure of the compacted specimen remained intact. No impurity or phase of any other kind was detected. There is no segregation within the compacts. Results from energy dispersive spectroscopy ruled out the possibility of any segregation within the compacts. This high-quenching during rapid solidification minimize chemical segregation and formation of massive phases and hence ensures a homogeneous fine-grained structure. Scanning electron microscopy showed crack-free, voids-free, melt-free, fracture-less compacts of titanium with a unidirectional dendrite orientation without any grain-growth. The particle size of the titanium powder calculated from SEM image found to be ~30μm that supports the earlier observation. Shock-wave consolidation being transient in nature, owing to its short processing time, controlled parameters and high quench-rates proven to be a very helpful technique for obtaining a stable structural and microstrutural products. Hence, SWC technique helped in forming the uniform melt-free, crack-free, voids-free compacts of titanium powder.","PeriodicalId":232294,"journal":{"name":"Journal of Metallic Material Research","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124063919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the present investigation a series of MoO3-Fe3O4 nanocomposite material such as MoO3, Fe3O4, Beta cyclodextrin (b-CD) doped MoO3-Fe3O4 and Graphite doped MoO3-Fe3O4 have been synthesized successfully by co-precipitation method. Synthesized nanomaterials were characterized in detail by XRD, FT-IR, TEM-HRTEM, UV-Vis DRS techniques. The crystalline size was in the range of 10±2 nm. The activity of the prepared material as a heterogeneous catalyst was successfully tested on the organic reaction of synthesis of substituted m-Chloro-Nitrobenzene and it was found to give excellent yield.
{"title":"Synthesis, Characterization and Applications of MoO3-Fe3O4 Nanocomposite Material","authors":"M. Navgire, Akash Nagare, G. Kale, S. Bhitre","doi":"10.30564/jmmr.v2i2.1124","DOIUrl":"https://doi.org/10.30564/jmmr.v2i2.1124","url":null,"abstract":"In the present investigation a series of MoO3-Fe3O4 nanocomposite material such as MoO3, Fe3O4, Beta cyclodextrin (b-CD) doped MoO3-Fe3O4 and Graphite doped MoO3-Fe3O4 have been synthesized successfully by co-precipitation method. Synthesized nanomaterials were characterized in detail by XRD, FT-IR, TEM-HRTEM, UV-Vis DRS techniques. The crystalline size was in the range of 10±2 nm. The activity of the prepared material as a heterogeneous catalyst was successfully tested on the organic reaction of synthesis of substituted m-Chloro-Nitrobenzene and it was found to give excellent yield.","PeriodicalId":232294,"journal":{"name":"Journal of Metallic Material Research","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123934130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rafael Fernández-Fuentes, A. Scotti, A. Cruz-Crespo, R. González, R. A. Gonçalves, N. G. Alcântara
The objective of this work was to study the effect of the heat treatment and further operation aging on the stereological parameters (size, quantity and volume fraction) of precipitates within ferrite grains of a creep-resistant 1.25Cr0.5Mo steel after long-term operation. The heat treatment was similar to the treatment that is carried out in industrial steam pipelines after welding (post weld heat treatment - PWHT) during installation and/or repairing. The operation aging corresponds to a subsequent long in-service operation after repairing. To determine the stereological parameters, SEM digital images were taken from samples of this material after conditions of in-service-aged (after long-term operation), in-service-aged and heat-treated (simulating repairing) and in-service-aged, heat-treated and in-laboratory aged (simulating subsequent long-term operation after repairing). The results indicate that the changes in the stereological parameters of the precipitates within ferrite grains after PWHT is associated with the coarsening process of the within-ferrite-grain precipitates as well as stabilizing the microstructure, since the material aging after PWHT of an in-serviced aged material would not change the stereological parameters.
{"title":"Stereological Evaluation of Precipitates within Ferrite Grains in Heat-Treated 1.25Cr0.5Mo Steel Previously Exposed to Service","authors":"Rafael Fernández-Fuentes, A. Scotti, A. Cruz-Crespo, R. González, R. A. Gonçalves, N. G. Alcântara","doi":"10.30564/jmmr.v2i2.1017","DOIUrl":"https://doi.org/10.30564/jmmr.v2i2.1017","url":null,"abstract":"The objective of this work was to study the effect of the heat treatment and further operation aging on the stereological parameters (size, quantity and volume fraction) of precipitates within ferrite grains of a creep-resistant 1.25Cr0.5Mo steel after long-term operation. The heat treatment was similar to the treatment that is carried out in industrial steam pipelines after welding (post weld heat treatment - PWHT) during installation and/or repairing. The operation aging corresponds to a subsequent long in-service operation after repairing. To determine the stereological parameters, SEM digital images were taken from samples of this material after conditions of in-service-aged (after long-term operation), in-service-aged and heat-treated (simulating repairing) and in-service-aged, heat-treated and in-laboratory aged (simulating subsequent long-term operation after repairing). The results indicate that the changes in the stereological parameters of the precipitates within ferrite grains after PWHT is associated with the coarsening process of the within-ferrite-grain precipitates as well as stabilizing the microstructure, since the material aging after PWHT of an in-serviced aged material would not change the stereological parameters.","PeriodicalId":232294,"journal":{"name":"Journal of Metallic Material Research","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134166768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The criterion-base iterative stepwise Backward Elimination (BE) method was used to predict Au according to the main variables (Ag, Cu, Pb, and Zn). The optimization process of the quadratic polynomial model are carried out on different trenches. Whereas, Pb and Zn with Ag×Zn and Pb×Zn are significant to determine the lateral dispersion of Au. It means Zn is the predominant element in near surface zone. Therefore, it point out that the polymetallic (Au-Ag-Cu-Pb-Zn) high-sulfidation hydrothermal veins may be related to a porphyry deposit at depth. Laterally, 2D surface contour maps using kriging confirms all the results of the dispersion pattern of elements at Glojeh.
{"title":"Lateral Dispersion Pattern of Main Indicators at the Glojeh Polymetallic Deposit, NW Iran","authors":"Farshad Darab-Golestan, A. Hezarkhani","doi":"10.30564/JMMR.V2I1.1001","DOIUrl":"https://doi.org/10.30564/JMMR.V2I1.1001","url":null,"abstract":" The criterion-base iterative stepwise Backward Elimination (BE) method was used to predict Au according to the main variables (Ag, Cu, Pb, and Zn). The optimization process of the quadratic polynomial model are carried out on different trenches. Whereas, Pb and Zn with Ag×Zn and Pb×Zn are significant to determine the lateral dispersion of Au. It means Zn is the predominant element in near surface zone. Therefore, it point out that the polymetallic (Au-Ag-Cu-Pb-Zn) high-sulfidation hydrothermal veins may be related to a porphyry deposit at depth. Laterally, 2D surface contour maps using kriging confirms all the results of the dispersion pattern of elements at Glojeh.","PeriodicalId":232294,"journal":{"name":"Journal of Metallic Material Research","volume":"16 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115496544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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