Transactions of the Japan Welding Society最新文献_第8页

Bonding Mechanism and Microstructure of Bonded Zone of AIN Ceramics with Ti-AgCu Brazing Metal AIN陶瓷与Ti-AgCu钎焊金属的结合机理及结合区微观结构

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.9.494

H. Okamura, Hideki Shinohara, Takao Funamoto, T. Shida

{"title":"Bonding Mechanism and Microstructure of Bonded Zone of AIN Ceramics with Ti-AgCu Brazing Metal","authors":"H. Okamura, Hideki Shinohara, Takao Funamoto, T. Shida","doi":"10.2207/QJJWS.9.494","DOIUrl":"https://doi.org/10.2207/QJJWS.9.494","url":null,"abstract":"Metallization and bonding of AIN ceramics were made using active brazing metal (Ti-AgCu). Active brazing metal used in metallization and bonding was in paste form prepared by adding Ti powder and organic solvent in to eutectic silver brazing metal powder.Characterization and bonding mechanism of the bonded layer, and relation between the thichness of the reacted layer and bonding strength were studied.The results of this study are as follows :(1) The microstructure of the bonded layer between AIN ceramics and Ti-AgCu brazing metal is found to be TiN layer of about 0.2 to 0.8 μm in thickness at the AIN interface, a composite layer of TiC, AICu as a middle layer and Ag-Cu alloy layer at the surface side.(2) Thickness of TiN layer did not change by the amount of Ti addition in silver brazing metal but the thicness of TiCu and AlCu layers are increased with increase of Ti addition in silverbrazing metal. Activation energy of growth of TiN layer is found to be 20 kJ/mol.(3) When the amount of Ti addition is more than 15 mass%, the bonding strength is decresed and the bonded layer is broken. Because the thickness of brittle TiCu layer increases with the increase of the Ti cotent in silver brazing metal.","PeriodicalId":273687,"journal":{"name":"Transactions of the Japan Welding Society","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123659422","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}

引用次数: 8

Effect of Electrode Potential and Structure on the Susceptibility to HESCC in Duplex Stainless Steels Analytical Evaluation of Hydrogen Embrittlement Type SCC and Its Mechanism in Duplex Stainless Steel Welds 电极电位和结构对双相不锈钢中HESCC敏感性的影响双相不锈钢焊缝氢脆型SCC的分析评价及其机理

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.9.245

Y. Mukai, M. Murata, Jing-bo Wang

{"title":"Effect of Electrode Potential and Structure on the Susceptibility to HESCC in Duplex Stainless Steels Analytical Evaluation of Hydrogen Embrittlement Type SCC and Its Mechanism in Duplex Stainless Steel Welds","authors":"Y. Mukai, M. Murata, Jing-bo Wang","doi":"10.2207/QJJWS.9.245","DOIUrl":"https://doi.org/10.2207/QJJWS.9.245","url":null,"abstract":"In this paper the authors discussed the depedence of crack initiation properties on potential and the effect of microstructures on the crack initiation and propagation properties in duplex stainless steels. It was clear that at less noble potential crack initiation occured from ferritic phase near the tip of austenitic phase which was controled by HESCC in this region. On the other hand, at noble potential crack initiated from corrosion pets which was formed at the boundary of ferritic and austenitic phases. As the effect of potential on the time to failure with decreasing the potential the time to failure decreased greatly both in a single ferritic phase stainless steel and duplex stainless steels, but even at the potential of -1.5V vs SCE there were no failures to he observed in a single austentic phase stainless steel, which means that austenitic phase is unsusceptible to HESCC. Additionally, as the effecc of ferrite content on HESCC properties of duplex stainless steels, with decreasing ferrite content the threshold stress increased and crack growth rate decreased greatly, which means that austenitic phase has a keying effect on crack propagating through ferritic phase. At the region of ferrite content less than 45%, threshold stress was nearly as same as the tensile strength of the materials and crack could not propagate through austenitic phase because of the continuousness of the austenitic phase which will prevent crack propagating through ferritic phase. Therefore, ferrite content of 45% should be considered as a critical value for crack initiating and propagating in duplex stainless steels.","PeriodicalId":273687,"journal":{"name":"Transactions of the Japan Welding Society","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126187820","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}

引用次数: 1

Measurement of temperature and velocity of thermally sprayed particles using thermal radiation. 用热辐射测量热喷涂颗粒的温度和速度。

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.8.132

S. Kuroda, H. Fujimori, T. Fukushima, S. Kitahara

{"title":"Measurement of temperature and velocity of thermally sprayed particles using thermal radiation.","authors":"S. Kuroda, H. Fujimori, T. Fukushima, S. Kitahara","doi":"10.2207/QJJWS.8.132","DOIUrl":"https://doi.org/10.2207/QJJWS.8.132","url":null,"abstract":"Methods to measure the surface temperature and the velocity of thermally sprayed particles were developed and applied to plasma-sprayed Mo, Ni-Cr alloy, and alumina particles in the air.In the temperature measurement, radiation from particles within a cylindrical measurement volume is measured and its spectrum is analyzed by a monochromator. Then the spectrum is compared with the spectra of blackbody radiation to determine the surface temperature of the particles through the least squares method.Spatial filtering technique using a mask with four thin parallel slits was adopted in the velocity measurement. When a single particle travels in front of the plates, radiation passing through the spacings between the plates is detected by a photo-multiplier, which gives a signal with four peaks. Then the velocity v of the particle is given by υ=d/t, where d is the distance between the neighboring slits and t the period between the peaks. It was also found that the mean velocity of a high-density particle stream can be determined by analyzing the power spectrum of the signal by a method such as FFT.As the results of those measurements, the change in the temperature and the velocity of sprayed particles with the distance from the exit of a plasma-torch was obtained. Where as the metal powders exhibited similar history of cooling and deceleration with the distance, alumina particles were found to be accelerated to a much higher velocity close to 300 m/s but decelerated at a much faster rate. The temperature of alumina particles could be measured for only a limited region due to the weak radiation. Also the effects of particle size on the distribution of both the temperature and the velocity of sprayed Mo particles were examined.","PeriodicalId":273687,"journal":{"name":"Transactions of the Japan Welding Society","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115368717","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}

引用次数: 4

TLP Weldability of Nickel-Base Superalloys 镍基高温合金TLP可焊性

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS1943.49.462

A. Suzumura, T. Onzawa, H. Tamura

引用次数: 1

Study of Residual Stress in the Vicinity of Interface Corner of Sprayed Coatings. 喷涂涂层界面角附近残余应力的研究。

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/qjjws.9.430

T. Terasaki, T. Akiyama, T. Hirai, K. Seo

引用次数: 0

Spot Welding of Iron-based and Cobalt-based Amorphous Alloy Foils (Report 2) 铁基和钴基非晶合金箔的点焊(报告二)

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.9.457

S. Fukushima, T. Kasugai

引用次数: 0

Desensitization of Stainless Steels by Laser Surface Heat-Treatment 不锈钢激光表面热处理的脱敏研究

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.5.445

Y. Nakao, K. Nishimoto

{"title":"Desensitization of Stainless Steels by Laser Surface Heat-Treatment","authors":"Y. Nakao, K. Nishimoto","doi":"10.2207/QJJWS.5.445","DOIUrl":"https://doi.org/10.2207/QJJWS.5.445","url":null,"abstract":"Laser heating was applied for the desensitization heat-treatment of the surface layer in the sensitized HAZ of Type 304 stainless steel. The degree of sensitization was examined by EPR technique and the 10% oxalic acid electrolytic etch test. The CO2 laser with maximum power of 1.5kW was used for heat-treatment. Time-Temperature-Desensitization diagram (TTDS diagram) for sensitized Type 304 stainless steels were developed by calculation assuming the chromium diffusion control for desensitization which might occur when the chromium depleted zone was healed up due to dissolution of chromium carbide and chromium diffusion from the matrix being heated at the solution annealing temperatures. TTDS diagrams calculated agree fairly well with ones determined by corrosion tests. Laser irradiation conditions (e.g., Laser power, beam diameter and traveling velocity )required for desensitization of sensitized Type 304 stainless steels were calculated using additivity rule from the TTDS diagram calculated and theoretical thermal curve of laser heating derived from the heat conduction theory. After laser beam irradiated under an optimum condition predicted by calculation, the sensitized HAZ of Type 304 stainless steel restored complete resistance to intergranular corrosion.","PeriodicalId":273687,"journal":{"name":"Transactions of the Japan Welding Society","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131072843","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}

引用次数: 8

The Nitrogen Absorption of Stainless Steel Weld Metal during Gas Tungsten Arc Welding 不锈钢焊缝金属在钨极气体保护焊中的氮吸收

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.2.669

T. Kuwana, H. Kokawa, Kensuke Naitoh

{"title":"The Nitrogen Absorption of Stainless Steel Weld Metal during Gas Tungsten Arc Welding","authors":"T. Kuwana, H. Kokawa, Kensuke Naitoh","doi":"10.2207/QJJWS.2.669","DOIUrl":"https://doi.org/10.2207/QJJWS.2.669","url":null,"abstract":"Using an arc atmosphere controlling chamber, effects of the welding conditions and atmosphere on the nitrogen content of the stainless steel weld metal by gas tungsten arc welding were investigated in comparison with those on the iron weld metal. The results are as follows:(1) The temperatures of stainless steel and iron molten pools were measured as about 1530°C and 1630°C, respectively.(2) The nitrogen content of stainless steel weld metal decreased with increasing the welding current, as well as that of iron weld metal.(3) The nitrogen content of stainless steel weld metal hardly depended on the arc length, as well as that of iron weld metal.(4) The nitrogen content of stainless steel weld metal increased with increasing the travel speed, while that of iron weld metal hardly depended on the travel speed.(5) The nitrogen content of stainless steel weld metal increased with the nitrogen partial pressure at low nitrogen partial pressure region, and was constant at the nitrogen partial pressure region above 0.2 atm in N2-Ar gas mixture atmosphere, as well as that of iron weld metal.(6) The nitrogen absorption by stainless steel weld metal was discussed with equilibrium data.","PeriodicalId":273687,"journal":{"name":"Transactions of the Japan Welding Society","volume":"4 10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128791590","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}

引用次数: 13

Mechanical Propertics of Mild Steel Weld Metals Produced in Pressurized Ar-CO_2 Atmospheres 加压Ar-CO_2气氛下低碳钢焊接金属的力学性能

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.9.233

T. Kuwana, H. Kokawa, R. Kiguchi

引用次数: 1

Study on Penetration Form Using Stationary TIG Arc : Study on Low Speed DC-TIG Welding Method 固定TIG电弧熔透成形研究:低速DC-TIG焊接方法的研究

Transactions of the Japan Welding Society Pub Date : 1900-01-01 DOI: 10.2207/QJJWS.10.353

T. Hinata, K. Yasuda, Yukio Kasuga, T. Onzawa

引用次数: 6