T. Sakai, T. Furushima, K. Manabe, H. Morimoto, E. Nakamachi
In order to improve the material characteristics of single and polycrystals of pure aluminum, the relationships between crystallographic orientations and microstructures, and the mechanical properties were examined. Several conventional grain-forming procedures, such as accumulative roll bonding (ARB), equal-channel angular pressing (ECAP) and accumulative forging bonding (AFB), were performed to obtain the ultrafine-grained structure. Furthermore, some analytical results, such as crystal direction maps, inverse pole figure (IPF), and texture, were obtained from the SEM-electron backscattered diffraction pattern (EBSP). As a result, (1) for the ARB method, increases of strength and ductility were shown, since the cube orientation was developed; (2) for the ECAP method, in the extrusion direction (ED) plane at the die angle Ψ=100°, peculiar distributions of microstructure and hardness were obtained; (3) for the AFB method, stratified inclination microstructures were obtained, and thus the typical texture was also observed.
{"title":"Crystallographic Orientation Observation and Mechanical Properties Evaluation of Fine-Grained Pure Aluminum","authors":"T. Sakai, T. Furushima, K. Manabe, H. Morimoto, E. Nakamachi","doi":"10.1299/JSMEA.49.216","DOIUrl":"https://doi.org/10.1299/JSMEA.49.216","url":null,"abstract":"In order to improve the material characteristics of single and polycrystals of pure aluminum, the relationships between crystallographic orientations and microstructures, and the mechanical properties were examined. Several conventional grain-forming procedures, such as accumulative roll bonding (ARB), equal-channel angular pressing (ECAP) and accumulative forging bonding (AFB), were performed to obtain the ultrafine-grained structure. Furthermore, some analytical results, such as crystal direction maps, inverse pole figure (IPF), and texture, were obtained from the SEM-electron backscattered diffraction pattern (EBSP). As a result, (1) for the ARB method, increases of strength and ductility were shown, since the cube orientation was developed; (2) for the ECAP method, in the extrusion direction (ED) plane at the die angle Ψ=100°, peculiar distributions of microstructure and hardness were obtained; (3) for the AFB method, stratified inclination microstructures were obtained, and thus the typical texture was also observed.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133226169","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, thermal singular stresses in an elastic half-plane containing an infinite row of parallel cracks perpendicular to the boundary is considered. The half-plane is subjected to a uniform heat flux and a uniform mechanical load. The crack surfaces and free surface of the half-plane are maintained at uniform temperatures. The Fourier transform techniques are used to formulate the problem in terms of singular integral equations. The singular integral equations are solved by using the Gauss-Jacobi integration formula. Both the cases of an internal crack and an edge crack are studied. Numerical calculations are carried out, and the effects of the geometric parameters on the temperature-thermal stress distributions and the thermal stress intensity factors are shown graphically.
{"title":"Thermal Mechanical Response of Elastic Half-Plane with Infinite Row of Parallel Cracks under Uniform Heat Flux","authors":"S. Ueda, J. Ando","doi":"10.1299/JSMEA.49.250","DOIUrl":"https://doi.org/10.1299/JSMEA.49.250","url":null,"abstract":"In this study, thermal singular stresses in an elastic half-plane containing an infinite row of parallel cracks perpendicular to the boundary is considered. The half-plane is subjected to a uniform heat flux and a uniform mechanical load. The crack surfaces and free surface of the half-plane are maintained at uniform temperatures. The Fourier transform techniques are used to formulate the problem in terms of singular integral equations. The singular integral equations are solved by using the Gauss-Jacobi integration formula. Both the cases of an internal crack and an edge crack are studied. Numerical calculations are carried out, and the effects of the geometric parameters on the temperature-thermal stress distributions and the thermal stress intensity factors are shown graphically.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133497948","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 a recent experiment, Zhang and co-workers found that a flexible filament in a flowing soap film can exhibit three states; stretched-straight, flapping, and bistability. When this experimental model is regarded as a one-dimensional flag in a two-dimensional fluid flow, their findings contradict the common idea that flags always flap in a wind. In this paper, the flag-in-wind problem is simulated by fluid-structure interaction finite element analysis where Navier-Stokes equations based on the ALE method are strongly coupled with Lagrangian equilibrium equations of the structure. In the simulation the three states are successfully reproduced, and the effects of some representative parameters on the amplitude and frequency of the oscillations are investigated to reveal the underlying mechanism involved in flag flapping.
{"title":"Fluid-Structure Interaction Analysis of a Two-Dimensional Flag-in-Wind Problem by the ALE Finite Element Method","authors":"Tomohiro Sawada, T. Hisada","doi":"10.1299/JSMEA.49.170","DOIUrl":"https://doi.org/10.1299/JSMEA.49.170","url":null,"abstract":"In a recent experiment, Zhang and co-workers found that a flexible filament in a flowing soap film can exhibit three states; stretched-straight, flapping, and bistability. When this experimental model is regarded as a one-dimensional flag in a two-dimensional fluid flow, their findings contradict the common idea that flags always flap in a wind. In this paper, the flag-in-wind problem is simulated by fluid-structure interaction finite element analysis where Navier-Stokes equations based on the ALE method are strongly coupled with Lagrangian equilibrium equations of the structure. In the simulation the three states are successfully reproduced, and the effects of some representative parameters on the amplitude and frequency of the oscillations are investigated to reveal the underlying mechanism involved in flag flapping.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131528541","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 robust optimal design of a bulk-micromachined, decoupled vibratory microgyroscope was carried out to determine geometric dimensions such that the gyroscopic performance is least affected by a fabrication tolerance. Electro-mechanical vibration analysis considering the sensing electrodes and the electronic signal processing were performed to obtain the frequency responses that influence the gyroscopic performance. A statistically distributed lateral over-etching (LOE) developed in the fabrication process was selected as a fabrication tolerance factor. The dimensions of the driving and sensing spring are selected as design variables which are the sum of deterministic mask dimensions and the LOE. To minimize the influence of LOEon the decoupled vibratory microgyroscope performance, the multi-objective function was formulated so as to minimize the sensitivities of the frequency difference with respect to the LOE. As a result, the standard deviation of the frequency difference and the driving natural frequency are reduced to 78% and 8%, respectively, through the Monte Carlos Simulation (MCS).
为了使陀螺性能受加工公差影响最小，对本体微机械解耦振动微陀螺仪进行了鲁棒优化设计。通过考虑传感电极的机电振动分析和电子信号处理，得到了影响陀螺性能的频率响应。选择在制造过程中产生的统计分布的横向过蚀刻(LOE)作为制造公差因子。选择驱动弹簧和传感弹簧的尺寸作为设计变量，该设计变量为确定性掩模尺寸与LOE之和。为了最小化LOE对解耦振动微陀螺仪性能的影响，建立了多目标函数，以最小化LOE对频率差的灵敏度。因此，通过蒙特卡罗仿真(Monte Carlos Simulation, MCS)，频率差和驱动固有频率的标准差分别降低到78%和8%。
{"title":"Robust Design of a Decoupled Vibratory Microgyroscope Considering Over-Etching as a Fabrication Tolerance Factor","authors":"S. Ha, Hee-Moon Jeong, Jun-o Kim","doi":"10.1299/JSMEA.49.273","DOIUrl":"https://doi.org/10.1299/JSMEA.49.273","url":null,"abstract":"A robust optimal design of a bulk-micromachined, decoupled vibratory microgyroscope was carried out to determine geometric dimensions such that the gyroscopic performance is least affected by a fabrication tolerance. Electro-mechanical vibration analysis considering the sensing electrodes and the electronic signal processing were performed to obtain the frequency responses that influence the gyroscopic performance. A statistically distributed lateral over-etching (LOE) developed in the fabrication process was selected as a fabrication tolerance factor. The dimensions of the driving and sensing spring are selected as design variables which are the sum of deterministic mask dimensions and the LOE. To minimize the influence of LOEon the decoupled vibratory microgyroscope performance, the multi-objective function was formulated so as to minimize the sensitivities of the frequency difference with respect to the LOE. As a result, the standard deviation of the frequency difference and the driving natural frequency are reduced to 78% and 8%, respectively, through the Monte Carlos Simulation (MCS).","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128413203","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}
Thermo-mechanical behavior in a rod subjected to a pulsed heat input was investigated by numerical simulation using the hyperbolic thermo-elasticity theory derived from the thermal dynamics in the present paper. Unlike the classical thermo-elastic theory with the parabolic energy equation and the hyperbolic motion equation, temperature response and thermal stress due to the temperature change exhibit significant wavy characteristics in the hyperbolic thermo-elasticity theory which is based on the non-Fourier heat conduction. The whole region of the rod is split into the heat disturbed region and the heat undisturbed region by the thermal wave front which is determined by the propagating velocity of the heat wave. The heat wave and elastic wave travel in the body at a finite velocity and reflect at the end of the rod. Thermal shock due to the discontinuous jump in thermal condition, and the reflection of thermal stress at the end terminate of the rod are significant during the heating process.
{"title":"Hyperbolic Thermoelastic Analysis due to Pulsed Heat Input by Numerical Simulation","authors":"N. Yu, S. Imatani, Tatsuo Inoue","doi":"10.1299/JSMEA.49.180","DOIUrl":"https://doi.org/10.1299/JSMEA.49.180","url":null,"abstract":"Thermo-mechanical behavior in a rod subjected to a pulsed heat input was investigated by numerical simulation using the hyperbolic thermo-elasticity theory derived from the thermal dynamics in the present paper. Unlike the classical thermo-elastic theory with the parabolic energy equation and the hyperbolic motion equation, temperature response and thermal stress due to the temperature change exhibit significant wavy characteristics in the hyperbolic thermo-elasticity theory which is based on the non-Fourier heat conduction. The whole region of the rod is split into the heat disturbed region and the heat undisturbed region by the thermal wave front which is determined by the propagating velocity of the heat wave. The heat wave and elastic wave travel in the body at a finite velocity and reflect at the end of the rod. Thermal shock due to the discontinuous jump in thermal condition, and the reflection of thermal stress at the end terminate of the rod are significant during the heating process.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"2 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132153101","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}
This paper is concerned with an application of the homotopy boundary element method originally proposed by Liao and Chwang to analysis of nonlinear transient heat conduction in anisotropic solids. Usually, a domain integral arises in the boundary integral equation of this formulation. Some ideas are needed to keep the boundary-only feature of BEM. In this paper, the resulting domain integral is transformed into a boundary integral by the dual reciprocity method using a new set of radial basis functions. Mathematical formulations of this approach for two-dimensional problems are presented in detail. Two schemes are discussed in this paper : The “isotropic” scheme, in which the state before mapping is considered as steady state heat conduction in isotropic solids, and the “anisotropic” scheme, where the state before mapping as steady state heat conduction in anisotropic solids. The proposed solution procedure is applied to a couple of typical examples, and the accuracy and other numerical properties of the proposed BEM are demonstrated through discussions of the results obtained.
{"title":"Analysis of Two-Dimensional Nonlinear Transient Heat Conduction in Anisotropic Solids by Boundary Element Method Using Homotopy and Dual Reciprocity","authors":"S. Ishiguro, Masataka Tanaka","doi":"10.1299/JSMEA.49.163","DOIUrl":"https://doi.org/10.1299/JSMEA.49.163","url":null,"abstract":"This paper is concerned with an application of the homotopy boundary element method originally proposed by Liao and Chwang to analysis of nonlinear transient heat conduction in anisotropic solids. Usually, a domain integral arises in the boundary integral equation of this formulation. Some ideas are needed to keep the boundary-only feature of BEM. In this paper, the resulting domain integral is transformed into a boundary integral by the dual reciprocity method using a new set of radial basis functions. Mathematical formulations of this approach for two-dimensional problems are presented in detail. Two schemes are discussed in this paper : The “isotropic” scheme, in which the state before mapping is considered as steady state heat conduction in isotropic solids, and the “anisotropic” scheme, where the state before mapping as steady state heat conduction in anisotropic solids. The proposed solution procedure is applied to a couple of typical examples, and the accuracy and other numerical properties of the proposed BEM are demonstrated through discussions of the results obtained.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"117 3-4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132879645","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 effect of in-situ formation of reinforcing phase on the mechanical properties of FeAl intermetallic alloy was studied. The in-situ FeAl composites containing Al2O3 or Fe3AlC were fabricated by mechanical alloying of elemental powders and mill scale powder followed by vacuum hot pressing. The starting materials were mixed in the appropriate ratio to synthesize 10vol% of the reinforcing phase. FeAl+Al2O3 and FeAl+Fe3AlC alloys showed high hardness value of HV813 and HV524, respectively. The effect of testing temperature on the 0.2% proof stress was evaluated at the temperature range from room to 1273K under compression. FeAl+Al2O3 and FeAl+Fe3AlC alloy showed proof stress of 2240MPa and 1380MPa at room temperature, respectively. At higher temperatures above 773K the proof stress decreased rapidly. The FeAl base in-situ composites including Fe3AlC or Al2O3 showed the high stress exponent and activation energy in the temperatures range of 1073-1273K.
{"title":"The Effect of in-situ Formation of Al2O3 or Fe3AlC on the Structural and Mechanical Properties of FeAl Intermetallic Alloys","authors":"K. Isonishi, M. Hashii, K. Ameyama","doi":"10.1299/JSMEA.49.229","DOIUrl":"https://doi.org/10.1299/JSMEA.49.229","url":null,"abstract":"The effect of in-situ formation of reinforcing phase on the mechanical properties of FeAl intermetallic alloy was studied. The in-situ FeAl composites containing Al2O3 or Fe3AlC were fabricated by mechanical alloying of elemental powders and mill scale powder followed by vacuum hot pressing. The starting materials were mixed in the appropriate ratio to synthesize 10vol% of the reinforcing phase. FeAl+Al2O3 and FeAl+Fe3AlC alloys showed high hardness value of HV813 and HV524, respectively. The effect of testing temperature on the 0.2% proof stress was evaluated at the temperature range from room to 1273K under compression. FeAl+Al2O3 and FeAl+Fe3AlC alloy showed proof stress of 2240MPa and 1380MPa at room temperature, respectively. At higher temperatures above 773K the proof stress decreased rapidly. The FeAl base in-situ composites including Fe3AlC or Al2O3 showed the high stress exponent and activation energy in the temperatures range of 1073-1273K.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128787089","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}
K. Nagano, A. Yaguchi, T. Terasaki, Kenichi Yamamoto
Solder joints between a package and a printed wiring board (PWB) of a portable electronic device sustain heat cycling as a result of power on-off operations, cyclic bending by key pad operation, and impact bending by dropping. Therefore, heat cycling, cyclic bending, and cyclic impact bending tests were conducted on the ball grid array solder joints between a chip scale package and a PWB. The evaluated solders were Sn-3Ag-0.5Cu and Sn-37Pb. The tests showed that the life cycles of the Sn-3Ag-0.5Cu solder joints for the heat cycling and cyclic bending tests were approximately twice those of the Sn-37Pb solder joints. For the cyclic impact bending test, however, the life cycle of the Sn-3Ag-0.5Cu joint under large strain was smaller than that of the Sn-37Pb solder joint because of interfacial crack growth between the solder and the PWB. Finally, fatigue lives of the joints were compared with crack initiation and failure lives of plain specimens by calculating local strain ranges in the joints by elastic-plastic finite element analysis.
{"title":"Fatigue Strength of BGA Type Solder Joints between Package and Printed Wiring Board of Portable Device","authors":"K. Nagano, A. Yaguchi, T. Terasaki, Kenichi Yamamoto","doi":"10.1299/JSMEA.49.220","DOIUrl":"https://doi.org/10.1299/JSMEA.49.220","url":null,"abstract":"Solder joints between a package and a printed wiring board (PWB) of a portable electronic device sustain heat cycling as a result of power on-off operations, cyclic bending by key pad operation, and impact bending by dropping. Therefore, heat cycling, cyclic bending, and cyclic impact bending tests were conducted on the ball grid array solder joints between a chip scale package and a PWB. The evaluated solders were Sn-3Ag-0.5Cu and Sn-37Pb. The tests showed that the life cycles of the Sn-3Ag-0.5Cu solder joints for the heat cycling and cyclic bending tests were approximately twice those of the Sn-37Pb solder joints. For the cyclic impact bending test, however, the life cycle of the Sn-3Ag-0.5Cu joint under large strain was smaller than that of the Sn-37Pb solder joint because of interfacial crack growth between the solder and the PWB. Finally, fatigue lives of the joints were compared with crack initiation and failure lives of plain specimens by calculating local strain ranges in the joints by elastic-plastic finite element analysis.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"24 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120983651","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 equations for the extended Lord-Shulman (LS) and Green-Lindsay (GL) models are solved for thermoelastic analysis in a semi-infinite medium by employing a finite element method using the theory of virtual displacement and the implicit Newmark algorithm. Simulations for both one-dimensional (1D) and two-dimensional (2D) models are performed to achieve the best approximation under prescribed boundary conditions. The effects of thermoelastic coupling factors and relaxation parameters on thermomechanical behavior of the medium are discussed for the two models. The results are consistent with our previous work using the Laplace transformation method.
{"title":"Coupled Finite Element Analysis of Generalized Thermoelasticity in Semi-Infinite Medium","authors":"Leping Zhou, D. Tang, N. Araki","doi":"10.1299/JSMEA.49.195","DOIUrl":"https://doi.org/10.1299/JSMEA.49.195","url":null,"abstract":"The equations for the extended Lord-Shulman (LS) and Green-Lindsay (GL) models are solved for thermoelastic analysis in a semi-infinite medium by employing a finite element method using the theory of virtual displacement and the implicit Newmark algorithm. Simulations for both one-dimensional (1D) and two-dimensional (2D) models are performed to achieve the best approximation under prescribed boundary conditions. The effects of thermoelastic coupling factors and relaxation parameters on thermomechanical behavior of the medium are discussed for the two models. The results are consistent with our previous work using the Laplace transformation method.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114903535","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}
Characteristics of hydrogen permeation in the stainless steel 304 modified by either facing, ion sputtering, carbon coating or annealing were investigated in order to establish the safe hydrogen-energy-infrastructure using welding. A stationary hydrogen flux from the stainless steel surface was measured by using a system with an orifice. The pressure difference of the specimen was able to maintain constant by controlling the gas flow rate from the orifice in low pressure vessel. The hydrogen permeability was low in two cases of a thin stainless steel with fine facing and that annealed at 1370K for 2 hours. In these cases, the specimens’ surfaces were considered to play hydrogen trap role and to prevent from pairing hydrogen atoms. On the other hand, high hydrogen permeability was obtained in the case of Argon plasma cleaning a low-pressure-vessel side surface. These results suggest that oxide film on the specimens’ surface prevent hydrogen desorption.
{"title":"Effect of Oxide Film on the Reduction of Hydrogen Permeation Rate in Stainless Steel","authors":"T. Yamazaki, T. Ikeshoji, A. Suzumura, T. Naito","doi":"10.1299/JSMEA.49.58","DOIUrl":"https://doi.org/10.1299/JSMEA.49.58","url":null,"abstract":"Characteristics of hydrogen permeation in the stainless steel 304 modified by either facing, ion sputtering, carbon coating or annealing were investigated in order to establish the safe hydrogen-energy-infrastructure using welding. A stationary hydrogen flux from the stainless steel surface was measured by using a system with an orifice. The pressure difference of the specimen was able to maintain constant by controlling the gas flow rate from the orifice in low pressure vessel. The hydrogen permeability was low in two cases of a thin stainless steel with fine facing and that annealed at 1370K for 2 hours. In these cases, the specimens’ surfaces were considered to play hydrogen trap role and to prevent from pairing hydrogen atoms. On the other hand, high hydrogen permeability was obtained in the case of Argon plasma cleaning a low-pressure-vessel side surface. These results suggest that oxide film on the specimens’ surface prevent hydrogen desorption.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126155808","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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