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Online since: March 2023
Authors: Vlastimil Vodárek, Renáta Palupčíková, Anastasia Volodarskaja, Kryštof Hradečný
Introduction
Grain-oriented electrical steel is an important magnetically soft material for transformer cores due to its excellent magnetic properties.
In the production process of GOES, there are many important factors that affect the resulting magnetic properties, the progress of secondary recrystallization and the associated sharpness of the Goss texture.
One of these factors is the use of inhibitors to supress normal grain growth after primary recrystallization and thus to provide the driving force for secondary recrystallization [4 - 7].
Specimens for LM and SEM analyses were prepared by mechanical grinding, polishing and etching.
CZ.02.2.69/0.0/19_073/0016945 within the Operational Programme Research, Development and Education, under project DGS/TEAM/2020-026 “Study of phase transformations in cast strips GOES”, the projects of Student Grant Competition SP2022/33 “Study of the relationship between the microstructure and properties of progressive technical materials, degradation mechanisms and behaviour of progressive technical materials in different operating conditions” and SP2022/68 “Specific research in the metallurgical, materials and process engineering”.
In the production process of GOES, there are many important factors that affect the resulting magnetic properties, the progress of secondary recrystallization and the associated sharpness of the Goss texture.
One of these factors is the use of inhibitors to supress normal grain growth after primary recrystallization and thus to provide the driving force for secondary recrystallization [4 - 7].
Specimens for LM and SEM analyses were prepared by mechanical grinding, polishing and etching.
CZ.02.2.69/0.0/19_073/0016945 within the Operational Programme Research, Development and Education, under project DGS/TEAM/2020-026 “Study of phase transformations in cast strips GOES”, the projects of Student Grant Competition SP2022/33 “Study of the relationship between the microstructure and properties of progressive technical materials, degradation mechanisms and behaviour of progressive technical materials in different operating conditions” and SP2022/68 “Specific research in the metallurgical, materials and process engineering”.
Online since: September 2011
Authors: Wei Jiang, Chang Lin Sun, Xue Jun Zhou, Yan Lin
What has been studied on welded hollow spherical joint[2] indicates that the properties under 3-D load are similar with under one-way load and bearing capacity is mainly determined under one-way load.
In order to describe nonlinear properties of load-displacement curve, the loads of the joint are applied by controlling the values of displacement.
Consequently the above properties obtained by studying on the cast steel spherical joint under tension are suit for the joint under compression too.
According to the above definition, the influencing factors on bearing capacity of cast steel spherical joint subjected to tensile force are the same with those of joint subjected to compressive force.
The effect of diameter of cast steel tube on bearing capacity The outer diameter of cast steel tube affects bearing capacity greatly.
In order to describe nonlinear properties of load-displacement curve, the loads of the joint are applied by controlling the values of displacement.
Consequently the above properties obtained by studying on the cast steel spherical joint under tension are suit for the joint under compression too.
According to the above definition, the influencing factors on bearing capacity of cast steel spherical joint subjected to tensile force are the same with those of joint subjected to compressive force.
The effect of diameter of cast steel tube on bearing capacity The outer diameter of cast steel tube affects bearing capacity greatly.
Online since: April 2015
Authors: Rizki Aldila, Myrna Ariati Mochtar, Dwi Marta Nurjaya
It Shows that both samples of N and SPN have the Nitriding hardening effect only to a certain distance from the surface and does not affect the hardness of the core or center.
The rate of diffusion of an element is affected by two factors, temperature and activation energy of diffusion [11].
As already known, the density of defects or dislocations and grain size are two important factors that enhance the diffusion process of nitrogen [11, 15, 16].
[13] S Lu, “Strain-induced Microstructure Refinement in a Tool Steel Subjected to Surface Mechanical Attrition Treatment,” Journal of Materials Science and technology, vol. 26, no. 3, 2010, pp. 256-263
[17] S Kikuchi, and J Komotori, “Effect of Fine Particle Peening Treatment prior to Nitriding on Fatigue Properties of AISI 4135 Steel,” Journal of Solid Mechanics and Materials Engineering, vol. 2, no. 11, 2008, pp. 1444-1450.
The rate of diffusion of an element is affected by two factors, temperature and activation energy of diffusion [11].
As already known, the density of defects or dislocations and grain size are two important factors that enhance the diffusion process of nitrogen [11, 15, 16].
[13] S Lu, “Strain-induced Microstructure Refinement in a Tool Steel Subjected to Surface Mechanical Attrition Treatment,” Journal of Materials Science and technology, vol. 26, no. 3, 2010, pp. 256-263
[17] S Kikuchi, and J Komotori, “Effect of Fine Particle Peening Treatment prior to Nitriding on Fatigue Properties of AISI 4135 Steel,” Journal of Solid Mechanics and Materials Engineering, vol. 2, no. 11, 2008, pp. 1444-1450.
Online since: February 2012
Authors: Myrna Ariati Mochtar, Azwar Manaf, Eddy S. Siradj
The strength of a final product of steel is affected by its final austenite grain size.Almost applied models for grain growth based on Beck and Sellars equation , which has the isothermal condition assumption; whilst most of the materials processing take place under non-isothermal condition.
Introduction In thermomechanical treatment, austenite evolution has been studied for many years in order for improving the mechanical properties of steel by controlling microstructures by designing and controlling process parameter [1,2].
Another researchs are by Angel ZUFIA[12],Denis[13], and Anelli[14] , S.Jiao, J.Penning[15] obtained that non-isothermal Grain growth condition could be illustrated by isothermal grain growth equation with replacing Temperature factor with the average temperature during process as Effective Temperature (Teff) as explain by S.Akta[16].
From the modified formula aboves in equation 3, it was showed that the grain growth is affected by ∆T and cooling rate., or can be as follows Eq 4 dn – don = f [Cr]-m Cr is Cooling rates after hot rolling process is completed, m is constanta of cooling rate .
Denis; ISIJ International, Special Issue on Recent Advances in Modelling on Microstructural evolution and Properties of Steels, , vol. 32, No 3, (1992) pp 316 [6] E.Anelli; ISIJ Internationa, Special Issue on Recent Advances in Modelling on Microstructural evolution and Properties of Steels, vol. 32, No 3, (1992) pp 440 [7] S.Jiao, J.Penning,, F Leysen, Y.Houbaert and E Aernoudt, ISIJ International, Vol 40, No 10, (2000), pp 1035-1040
Introduction In thermomechanical treatment, austenite evolution has been studied for many years in order for improving the mechanical properties of steel by controlling microstructures by designing and controlling process parameter [1,2].
Another researchs are by Angel ZUFIA[12],Denis[13], and Anelli[14] , S.Jiao, J.Penning[15] obtained that non-isothermal Grain growth condition could be illustrated by isothermal grain growth equation with replacing Temperature factor with the average temperature during process as Effective Temperature (Teff) as explain by S.Akta[16].
From the modified formula aboves in equation 3, it was showed that the grain growth is affected by ∆T and cooling rate., or can be as follows Eq 4 dn – don = f [Cr]-m Cr is Cooling rates after hot rolling process is completed, m is constanta of cooling rate .
Denis; ISIJ International, Special Issue on Recent Advances in Modelling on Microstructural evolution and Properties of Steels, , vol. 32, No 3, (1992) pp 316 [6] E.Anelli; ISIJ Internationa, Special Issue on Recent Advances in Modelling on Microstructural evolution and Properties of Steels, vol. 32, No 3, (1992) pp 440 [7] S.Jiao, J.Penning,, F Leysen, Y.Houbaert and E Aernoudt, ISIJ International, Vol 40, No 10, (2000), pp 1035-1040
Online since: April 2021
Authors: Muhammad Musaddique Ali Rafique, Emeodi Christian Emeka
Important features which characterizes them are their amorphous structure and unique mechanical properties.
This effectively can be used for the evolution of preferred phases and thereby can be used to affect the properties of the alloy.
Thadhani, Mechanical properties of bulk metallic glasses.
Shiflet, Mechanical properties of iron-based bulk metallic glasses.
Vander Sande, The effects of devitrification on the mechanical properties of Cu46Zr54 metallic glass.
This effectively can be used for the evolution of preferred phases and thereby can be used to affect the properties of the alloy.
Thadhani, Mechanical properties of bulk metallic glasses.
Shiflet, Mechanical properties of iron-based bulk metallic glasses.
Vander Sande, The effects of devitrification on the mechanical properties of Cu46Zr54 metallic glass.
Online since: March 2015
Authors: Jian Hua Chen, Cong Han, Xue Li Shan, Bi Hong Song, Chun Yan Wang
Due to the wide-spreading saline soil in Xinjiang region, the highways at saline soil sections often suffer from salt heaving, frost boiling, leaching, saturated yielding and other hazards in this region, resulting in net-shaped pavement cracking, deformation and swelling and the like and consequently affecting the normal highway transportation.
Its mechanical property will also change accordingly.
These disasters not only affect the normal transportation, but also result in a huge economic loss. 1.2.1 Dissolved collapse deformation Due to the increase in water content or temperature, the salt in soil is dissolved and taken away by water, resulting in gradual loss of the soil strength.
Under the action of traveling vehicles, local pavement will swell and crack and mud will come up, resulting in muddy and slippery road surface and affecting the normal traveling of vehicles.
In the practical engineering, it is required to consider major influencing factors and seek for reasonable and effective treatment measures by combining the hydrogeololgy, climate and construction conditions; meanwhile, it is also required to combine the in-site actual situation to flexibly utilize the existing treatment measures and explore new treatment methods on this basis, so as to improve the saline soil treatment.
Its mechanical property will also change accordingly.
These disasters not only affect the normal transportation, but also result in a huge economic loss. 1.2.1 Dissolved collapse deformation Due to the increase in water content or temperature, the salt in soil is dissolved and taken away by water, resulting in gradual loss of the soil strength.
Under the action of traveling vehicles, local pavement will swell and crack and mud will come up, resulting in muddy and slippery road surface and affecting the normal traveling of vehicles.
In the practical engineering, it is required to consider major influencing factors and seek for reasonable and effective treatment measures by combining the hydrogeololgy, climate and construction conditions; meanwhile, it is also required to combine the in-site actual situation to flexibly utilize the existing treatment measures and explore new treatment methods on this basis, so as to improve the saline soil treatment.
Online since: December 2014
Authors: Rupinder Singh, Inderpreet Singh Ahuja, Rajesh Kumar
With the help of Post curing, shell Mold temperature was not found to affect the dimensional accuracy of the castings, significantly.
The 3-D factor interaction graphs using RSM have been plotted to understand the influence of process parameters on response factors viz. dimensional accuracy in the form of average outer diameter (AOD).
The percentage errors between the predicted and experimentally observed values of response factors are within 5%.
Dev. 7.547E-004 Mean 1.69 C.V. 0.045 PRESS 4.564E-005 R-Squared 0.7965 Adj R-Squared 0.7633 Pred R-Squared 0.7036 Adeq Precision 20.189 For diagnose the statistical properties of the model by using the design expert can be analyzed by inspection of various plots.
The percentage errors between the predicted and experimentally observed values of response factors are within 5%.
The 3-D factor interaction graphs using RSM have been plotted to understand the influence of process parameters on response factors viz. dimensional accuracy in the form of average outer diameter (AOD).
The percentage errors between the predicted and experimentally observed values of response factors are within 5%.
Dev. 7.547E-004 Mean 1.69 C.V. 0.045 PRESS 4.564E-005 R-Squared 0.7965 Adj R-Squared 0.7633 Pred R-Squared 0.7036 Adeq Precision 20.189 For diagnose the statistical properties of the model by using the design expert can be analyzed by inspection of various plots.
The percentage errors between the predicted and experimentally observed values of response factors are within 5%.
Online since: November 2021
Authors: Cherifa Abid, Samia Aggoune, Farida Hamadi, Karim Kheloufi, Toufik Tamsaout, El-Hachemi Amara, Kada Boughrara
It should be noted that, the research work is extensive and covers different aspects such as laser scanning strategies, mechanical properties, and powder nature, among others.
Many researchers have presented correlations between parameters with microstructure or mechanical properties, such as Yadollahi et al. [15].
The complex thermo kinetics of the process is influenced by the process parameters and thermo physical properties of the material.
They found that the most significant factors for the process could be classified in this order: Powder thickness, scanning strategy, linear energy density and hatching distance.
Seely, Effects of process time interval and heat treatment on the mechanical and microstructural properties of direct laser deposited 316L stainless steel, Materials Science and Engineering: A. 644 , 171–183. (2015) [16] K.
Many researchers have presented correlations between parameters with microstructure or mechanical properties, such as Yadollahi et al. [15].
The complex thermo kinetics of the process is influenced by the process parameters and thermo physical properties of the material.
They found that the most significant factors for the process could be classified in this order: Powder thickness, scanning strategy, linear energy density and hatching distance.
Seely, Effects of process time interval and heat treatment on the mechanical and microstructural properties of direct laser deposited 316L stainless steel, Materials Science and Engineering: A. 644 , 171–183. (2015) [16] K.
Online since: December 2012
Authors: Lu Xia, Jin Huang, You Shou Zhang, Dan He
Results and discussion
Property of 32B8M15 binder no-bake sand.
Research on modified binder no-bake sand Influence of organics N on the property of 32B8M15 no-bake sand.
Influence of solidification agent amount on the property of 32B8M15N4 and 32B8M15 no-bake sand.
In order to eliminate external factors, 32B8M15N4 and 32B8M15 no-bake sand mold or core are made simultaneously to discuss the effect of addition amount of fused MgO on their performance, such as liftability, dry strength and storage stability.
Fig.3 shows property test results of 32B8M15N4 and 32B8M15 no-bake sand with adding MgO.
Research on modified binder no-bake sand Influence of organics N on the property of 32B8M15 no-bake sand.
Influence of solidification agent amount on the property of 32B8M15N4 and 32B8M15 no-bake sand.
In order to eliminate external factors, 32B8M15N4 and 32B8M15 no-bake sand mold or core are made simultaneously to discuss the effect of addition amount of fused MgO on their performance, such as liftability, dry strength and storage stability.
Fig.3 shows property test results of 32B8M15N4 and 32B8M15 no-bake sand with adding MgO.
Online since: May 2016
Authors: Denisa Donová, Naďa Zdražilová, Kateřina Havlíková
These building structures are strictly evaluated in terms of their thermal technical properties.
Although the building envelope has excellent thermal insulation properties it does not mean that the building envelope is designed correctly.
Mechanical and Physical Properties of Straw Bales.
Study of the Properties of the Environmentally Friendly Insulation Materials.
Thermal Properties of Wooden Buildings in Relation to Computer Software.
Although the building envelope has excellent thermal insulation properties it does not mean that the building envelope is designed correctly.
Mechanical and Physical Properties of Straw Bales.
Study of the Properties of the Environmentally Friendly Insulation Materials.
Thermal Properties of Wooden Buildings in Relation to Computer Software.