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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of Materials Processing
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Journal DOI :
The Korean Society for Technology of Plasticity
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Volume & Issues
Volume 8, Issue 6 - Dec 1999
Volume 8, Issue 5 - Oct 1999
Volume 8, Issue 4 - Aug 1999
Volume 8, Issue 3 - Jun 1999
Volume 8, Issue 2 - Apr 1999
Volume 8, Issue 1 - Feb 1999
Volume 5, Issue 5 - 00 1999
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Strain Energy Release Maximization Model for Recrystallization Textures
Lee,Dong Nyung ;
Transactions of Materials Processing, volume 5, issue 5, 1999, Pages 401~401
In 1995, the author advanced a model for the evolution of recrystallization texture. In the model ther absolute maximum internal stress direction due to dislocations generated during deformation or fabrication in the in the fabricated material is aligned with the minmim Young's modulus direction in recrystallized grains, whereby the energy release during recrystallization can be maximized. This comes from the fact that that material concerned dose not change macroscopically its shape and volume during recrystallization, and so the recrystallization is a displacement controlled process. This strain energy release maximization model originates from the presumption that the stored energy due to dislocation may be obtained from the operating slip systems, which are related to the deformation mode and texture. If one slip system is activated, the absolute maximum normal stress direction is parallel to the direction, or the Burgers vector direction. If more than one slip system is activated, the absolute maximum normal stress direction can be determined by the vector sum of realted ship directions, taking their contribution to slip into account. This paper discusses recystallization textures of plastically deformed and electrodeposited metals, based on the model. A brief comment was mede also on the growth textures of axisymmertrically deformed copper and silver and electrodeposited silver and Fe-Ni alloy.
Deep Drawing Textures in Low Carbon Steels
J.J.Jonas ; L.Kestens ;
Transactions of Materials Processing, volume 5, issue 5, 1999, Pages 419~419
Some recent papers published on orientation selection during the static recystallization of ferritic low carbon steels are reviewed. Both the oriented nucleation and selective growth theories are analyzed critically and classified according to physical mechni는 underlying these theories. The rewiew concentrates on the progress made by employing techinques of local orientation measurement such as electron backscattering diffraction (EBSD) and orientation imaging micryscopy (OIM). Using the latter technique, the present authors obtained strong evidence for the operation of a selective growth mechansim during the late stages of recrystallization of an ultra low carbon steel that was cold rolled to a reduction of 95%.
The Role of high Energy Boundaries and Coincidence Boundaries in the Secondary Recrystallization of Grain-oriented Silicon Steel
Jirou Harase ; Ryo Shimizu ; Kim,Jae Kwan ; Woo,Jong Soo ;
Transactions of Materials Processing, volume 5, issue 5, 1999, Pages 429~429
The probability of grains having misorientation angles at 20°-45°(
20-45) or a ∑9 orientation relatioship (
∑9) was determined using the three dimensional erentation distrbution obtained from the (100) pole figure. A primary recrystallized grain-oriented silicon steel specimen capable of evolving a sharp Gross texure was used. It was found that
20-45 was higher around the Gross orientation but the higher in the primary texture. Goss orientation has the highest
∑9 in the promary martix. The assumption that orientations with a higher
20-45 value can be nuclei for secondary recrystallization led to the prediction of secondary recystallization not being present in the secondary recystallization texture. Howecer, no such contradictory prediction was made on the assumption that orientations with a higher
∑9 value can be nuclei for secondary recrystallization. It is concluded, therfore, that grains with micorientation angles from 20°-45°are not important in the selction mechanism of Goss secondary recrystallization.
Evolution of Through-Thickness Texture Gradients in Various Steel Sheets
Huh,Moo Young ; Kim,Hyun Chul ; Park,Jong Jin ; Olaf Engler ;
Transactions of Materials Processing, volume 5, issue 5, 1999, Pages 437~437
In order to inverstigate the evolution of through-thickness texture gradiernts in various ferritic steel sheets, samples of a deep drawing steel, a ferritic stainless steel and a low carbon steel were deformed by cold rolling with and without application of lubricant during the deformation process. The hot basnd texture of all samples examined showed notable through-thickess texture gradients. The evolution of the cold rolling texture in the ferritic stainless steel and the low carbon steel in a solution-treated state was nearly independent of the lubrication during rolling. Howecer, in the deep drawing steel and the as-received low carbon steel, the lubrication during played an important role in the formation of the throughout the sheet thickness, in the samples rolles without lubrication showed unofrom textures were observed on the surface. The evolution of these through-thickess texture is discussed in terms of inhomogenous strain states computed by an FEM model.
The Application of Rational Approximation in the Calculation of a Temperature Field with a Non-liner Surface Heat-transfer Coefficient during Quenching for 42CrMo Steel Cylinder
Heming Cheng ; Xieqing Huang ; Jiang Fan ; Honggang Wang ;
Transactions of Materials Processing, volume 5, issue 5, 1999, Pages 445~445
The calculation of a temperature filed has a great influence upon the analysis of thermal stresses and stains during quenching. In this paper, a 42CrMo steel cylinder was used an example for inversrigation. From the TTT diagram of the 42CrMo steel, the CCT diagram was simulated by mathermatical transformation, and the volume fraction of phase consitituents was calculated. The thermal physical properties were treated as functions of temperature and the volume fraction of phase consitituts. The rational approximation was applied to the finite coefficients was calculated using this technique, which can effectively aviod oscillation the numerical solution for a small time step. The experimental results of the temperature filed calculation coincide with the numerical solutions.
Mathematical Modeling of Electrodeposition of Permalloy Thin Film I.Direct Current Plating
Doo,S.K. ; Sohn,H.J. ; Kang,T. ;
Transactions of Materials Processing, volume 5, issue 5, 1999, Pages 451~451
A mathermatical model is presented to describe the electrodeposition of Ni-Fe alloy film on a rotating disk electrode in chloride solution. The model incorporated with anomalous condeposition phenmena agrees well with the experimental data under a variety of conditions. The Fe content in permalloy shows a maximum at current between 2 mA/㎠ and 5 mA/㎠, then decreases monotonically as a function of the applied current dencity. Also experimental and simulated results are discussed in terms of solution pH, rotating disk speed, and iron concentration which affercts the Fe content in the permalloy during electrodeposition.
Mathematical Modeling of Electrodeposition of Permally Thin Film II. Pulsed Current Plating
Doo,S.K. ; Sohn,H.J. ; Kang,T. ;
Transactions of Materials Processing, volume 5, issue 5, 1999, Pages 459~459
A mathermatical model presented for direct current plating is extended to describe the electrodeposition of permalloy under current plating conditions. The agreement between the calculated and experimental values is excellent. The content od iron in permalloy thin under the pulsed current condition is higher than under direct current plating at the smae average current density, which is explained in terms of various plating parameters from simulated resulte.
The Deposition and Recrystallization Textures of Copper Electrodeposits Obtained from a Copper Cyanide Bath
Lee,Dong Nyung ; Yang,Jeom sik ;
Transactions of Materials Processing, volume 5, issue 5, 1999, Pages 465~465
The texture of copper electrodeposits obtained from an alkaline copper cyande bath changed from <110> to <111> with increasing cathod current density and with decreasing bath temperature. The <111> and <110> texture of copper electrodeposits cjanseg to the <100> and <√310> texture, respepectively, when they were recrystallized. These results are similar to those in copper electrodeposits obtained from acid copper sulfate and acid copper fluoborate baths.
Effects of Chemical Oxidations on the Fracture Toughness of Leadframe/EMC Interfaces
Lee,Ho Young ; Yu,Jin ;
Transactions of Materials Processing, volume 5, issue 5, 1999, Pages 471~471
Cu-based leadframe sheets were oxidized by a chemical oxidation method, which firmed two kinds of oxides on its surface, a black one and a black one. The oxidation characterisitics of each oxide were studies and then to measure the adhesion strength of the leadframe/EMC interface as a function of fracture toufhness, the oxidized leadframe samples were models with an epoxy molding compound (EMC) and machined to from sandwiched double-cantilever beam (SDCB) specimens. SEM and XRD studies on the surface of the oxidized leadframe as well as the measurement of fracture toughness showed that the interfacial fracture toughness is directly related to the formation of aciclur CuO precipitates on the surface of the surface of the leadframe. However, once a continuos layer of CuO percipitates formed on the saturate of the leadframe (brown oxide) or on the Cu₂O layer (black oxide), the interfacial fracture toughness is found to saturate of a further oxide thinckening. The size of the acicular precipitates seems to have a secondary effect on the interfacial fracture toughness.
The Effect of Grain Boundary on the Dissolution of Base Metal into Insert Metal during TLP Bonding of Ni-Base Superalloys
Kim,Dae Up ; Kang,Chung Yun ; Lee,Won Jae ;
Transactions of Materials Processing, volume 5, issue 5, 1999, Pages 477~477
The dissolution of base metal into insert metal during TLP bonding of Ni base CMSX-2 superalloys, was studied. The effect of grain size on yhe dissolution phenomenon was also investigated. TLP booding of single crystal, coarse grained and fine grained CMSX-2 specimens was carried out at 1373-1548 K for 019.6 ks under 2.3 Mpa. During TLP bonding, the dissolution of the base metal into insert metal occurred very rapidly, leading to constant dissolution width at a given holding time. The in all samples used. The dissolution of the base metal into the insert ,melt pool was governed by Nernst-Brunner's theory in any grain size of base metal. The saturation time for dissolving base metal shortened, but its width broasened with invreasing bonding temperature. The dissolution rate of the metal increased with dereasing grain size of the base metals.
Development of Hydrogen-Storage Alloys by Mechanical Alloying of Mg with Fe and Co
Song,Myoung Youp ; Ahn,Dong Su ; Kwon,Ik Hyun ; Ahn,Hyo Jun ;
Transactions of Materials Processing, volume 5, issue 5, 1999, Pages 485~485
The hydriding and dehydriding kinetics of Mg are reviewed. In order to improve the reaction kinetics of Mg with hydrogen, mechanically-alloyed Mg-10 wt.%Fe and Mg-10 wt.%Co mistures are prepared and therir hydrogen-storage properties are inverstigated. The activation of Mg-10 wt.%Fe is easier than that if Mg-10 wt.%Co. Howecer, The hydriding rates (at 567-589 K. 7-22 bar H₂) and dehydriding rates (at 589 K, 1.0 bar H₂) of the mechanically-alloyed Mg-10 wt.%Co are higher than those of the mechanically-alloyed Mg-10 wt.%Fe agter activation. The
value of Mg-10 wt.%Co after 60 min is 3,08 wt.% at 589 K under 11 bar H₂ and its
value after 60 min is 1.48wt.% at 589 K under 1.0 bar H₂. Mg-10wt.%Co has a maller particle size than has Mg-10 wt.%Fe after hydriding and dehydriding crycling. The mechanical alloying of Mg with Fe and Co and the hydriding-dehydriding cycling increased the hydriding are dehydriding rates by facilitating nucleation (by cerating defercts on the surface if the Mg particle and by the additive) and by shortening the diffusion distance (by reducing the Mg particle sizes).
Crystal Growth by Czochralski Method
Bae,In Kook ; Whang,Chin Myung ;
Transactions of Materials Processing, volume 5, issue 5, 1999, Pages 491~491
(Nd:BGO) crystals were successfully grown in the auto-diameter control system epuipped with a frequency weghing senser with the Czochralki method. The
ion doping level was varied from 0.25 to 2.5 at.%. The crystals were transparrnt and of light putple color, with a about 20mm in diameter and 50mm in length. The effective distribution coeffient (
ion was about 0.957 irrespective of concentration, and the
ions were distributed homogeneously throughout the ctystal. The doping concentration (
) of active ion in Nd:BGO crystal was 2.54×
ions/㎤, which is higher than that in the Nd:YAG crystal. Therefore, the Nd:BGO crystal was judged to be more suitable for the laser diode pumping ,icrochip laser meterial where size reduction was desirable.
Manganes Loss during the Oxygen Refining of High-Carbon Ferromanganess Melts
You,Byung Don ; Lee,Byung Wha ; Pak,Jong Jin ;
Transactions of Materials Processing, volume 5, issue 5, 1999, Pages 497~497
Decarburization tests of high-carbon ferromanganese melta by oxygen refining were successfully carried out in a model converter with 2-ton production capacity. During the oxygen refifing, the manganese loss was inherently accompanied by oxidation and evaporation. The oxidation loss of manganese into slag was affected by slag composition, melt temperature and slag weight. The oxidation loss of mangnese into slag was minimum at a slag basicity of ablut 1.5 and it increased with temoerature and salg wegiht. The amount of manganese evaporation loss was comparable to that of oxidation loss. An emporcal equation for the evaporation loss of manganese was derived as a function as a function of process variables. The apparent vaporization coeffient, β, was significantly affected by the oxygen mixing ratio in bottom blowing gas and the fraction of top blown oxygen.