Pub Date : 2017-03-27DOI: 10.2320/JINSTMET.JBW201613
優 鈴木, 祐司 須藤, 大輔 安藤, 淳一 小池
{"title":"Cr-Mo-N被膜の硬度および摩擦摩耗特性に及ぼすCu添加の影響","authors":"優 鈴木, 祐司 須藤, 大輔 安藤, 淳一 小池","doi":"10.2320/JINSTMET.JBW201613","DOIUrl":"https://doi.org/10.2320/JINSTMET.JBW201613","url":null,"abstract":"","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"112 1","pages":"270-275"},"PeriodicalIF":0.0,"publicationDate":"2017-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77982909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-02-24DOI: 10.2320/jinstmet.j2016062
Hiromu Hisazawa, Y. Terada
{"title":"Effect of Ti and Al Contents on γ′ Morphology in Wrought Ni-based Superalloys","authors":"Hiromu Hisazawa, Y. Terada","doi":"10.2320/jinstmet.j2016062","DOIUrl":"https://doi.org/10.2320/jinstmet.j2016062","url":null,"abstract":"","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"22 1","pages":"244-250"},"PeriodicalIF":0.0,"publicationDate":"2017-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89048624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-02-17DOI: 10.2320/jinstmet.jbw201611
Mami Kasakura, Y. Kimura
Two-phase microstructure consisting of the E21 type (Co, Ni)3 AlC, κ phase, and (Co, Ni) primary solid solution, α phase, forms having three different characteristic morphologies in the same alloy according to their thermal history. Two of them are observed in the as-cast microstructure; the primary α phase dendrite with fi ne cuboidal κ precipitates, and the eutectic lamellar consisting of α and κ phases. During heat treatments of the alloys at high temperatures, the nodular type discontinuous precipitation (DCP) lamellar, consisting of α and κ phases, forms locally in the primary α dendrite regions as the third morphology. The interlamellar spacing and nodule size of the DCP lamellar becomes larger with increasing heat treatment temperature. Micro-Vickers hardness numbers of the α primary dendrites having κ precipitates and the eutectic lamellar are comparable, and higher than those of the DCP lamellar. The alloy annealed at 1173 K for 96 h exhibits high yield strength, the 0.2% proof stress, exceeding about 800 MPa in compression, and the excellent ductility of 13.6% plastic strain at room temperature in tension. On the other hand, the DCP lamellar formation lowers the strength of the alloys, however high strength about 750 MPa can be maintained in the alloy heat treated at the highest temperature of 1373 K as the lowest yield stress of all. Elevated temperature strength measured at 1123 K for the alloy heat treated at 1173 K is 486 MPa of yield stress in compression. The DCP lamellar formation can be suppressed by the two-step heat treatments and by the unidirectional solidifi cation. The former has more homogeneous distribution of fi ne DCP lamellar than single-step heat treated alloys. The latter is very effective to improve the homogeneity and thermal stability of α and κ twophase aligned microstructure and to maintain high temperature strength of 452 MPa at 1123 K. [doi:10.2320/jinstmet.JBW201611]
{"title":"Effects of Two-Phase Microstructure Morphology on Mechanical Properties in Co-Base Heat Resistant Alloys Strengthened by E2 1 -（Co, Ni） 3 AlC Phase","authors":"Mami Kasakura, Y. Kimura","doi":"10.2320/jinstmet.jbw201611","DOIUrl":"https://doi.org/10.2320/jinstmet.jbw201611","url":null,"abstract":"Two-phase microstructure consisting of the E21 type (Co, Ni)3 AlC, κ phase, and (Co, Ni) primary solid solution, α phase, forms having three different characteristic morphologies in the same alloy according to their thermal history. Two of them are observed in the as-cast microstructure; the primary α phase dendrite with fi ne cuboidal κ precipitates, and the eutectic lamellar consisting of α and κ phases. During heat treatments of the alloys at high temperatures, the nodular type discontinuous precipitation (DCP) lamellar, consisting of α and κ phases, forms locally in the primary α dendrite regions as the third morphology. The interlamellar spacing and nodule size of the DCP lamellar becomes larger with increasing heat treatment temperature. Micro-Vickers hardness numbers of the α primary dendrites having κ precipitates and the eutectic lamellar are comparable, and higher than those of the DCP lamellar. The alloy annealed at 1173 K for 96 h exhibits high yield strength, the 0.2% proof stress, exceeding about 800 MPa in compression, and the excellent ductility of 13.6% plastic strain at room temperature in tension. On the other hand, the DCP lamellar formation lowers the strength of the alloys, however high strength about 750 MPa can be maintained in the alloy heat treated at the highest temperature of 1373 K as the lowest yield stress of all. Elevated temperature strength measured at 1123 K for the alloy heat treated at 1173 K is 486 MPa of yield stress in compression. The DCP lamellar formation can be suppressed by the two-step heat treatments and by the unidirectional solidifi cation. The former has more homogeneous distribution of fi ne DCP lamellar than single-step heat treated alloys. The latter is very effective to improve the homogeneity and thermal stability of α and κ twophase aligned microstructure and to maintain high temperature strength of 452 MPa at 1123 K. [doi:10.2320/jinstmet.JBW201611]","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"114 1","pages":"234-243"},"PeriodicalIF":0.0,"publicationDate":"2017-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79212391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-02-10DOI: 10.2320/JINSTMET.JE201605
泰也 松野, 江里 小此木, 彰大 吉村, 真理 佐藤, 主税 佐藤
{"title":"大気圧走査電子顕微鏡ASEMによる液相での 金のマイクロ粒子生成のin-situ観察","authors":"泰也 松野, 江里 小此木, 彰大 吉村, 真理 佐藤, 主税 佐藤","doi":"10.2320/JINSTMET.JE201605","DOIUrl":"https://doi.org/10.2320/JINSTMET.JE201605","url":null,"abstract":"","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"64 1","pages":"192-195"},"PeriodicalIF":0.0,"publicationDate":"2017-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76347624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-02-01DOI: 10.2320/JINSTMET.J2016043
玄 山根, 洋明 松本
{"title":"Ti-5Al-2Sn-2Zr-4Cr-4Mo（Ti-17）合金の静的熱処理過程の粒成長および静的球状化","authors":"玄 山根, 洋明 松本","doi":"10.2320/JINSTMET.J2016043","DOIUrl":"https://doi.org/10.2320/JINSTMET.J2016043","url":null,"abstract":"","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"12 1","pages":"60-65"},"PeriodicalIF":0.0,"publicationDate":"2017-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84843770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-20DOI: 10.2320/JINSTMET.J2016042
勇也 櫻井, 幸次 筧
{"title":"Ti-6Al-4Vレーザー積層材の組織と機械的特性","authors":"勇也 櫻井, 幸次 筧","doi":"10.2320/JINSTMET.J2016042","DOIUrl":"https://doi.org/10.2320/JINSTMET.J2016042","url":null,"abstract":"","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"1994 1","pages":"120-126"},"PeriodicalIF":0.0,"publicationDate":"2017-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89087434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.2320/JINSTMET.JE201604
H. Narita, Tomoya Suzuki, R. Motokawa
Most of the refineries for platinum group metals (PGMs) in Japan have adopted solvent extraction methods for mutual separation of PGMs. Few effective extractants for industrial use have been found although some industrial processes were established in 1970's. Recently, some compounds have been reported as candidates for practical PGM extractants in addition to new concepts for PGM extraction mechanisms. In this review article, we present well–known PGM recovery processes based on solvent extraction, industrial extractants and their properties, and conventional extraction mechanism for PGMs. Additionally, we discuss recent interesting extraction systems (amide–type compounds and ionic liquid) and then introduce new extraction concepts based on the specific interactions at the outer–sphere of a metal complex in the organic phase. [doi:10.2320/jinstmet.JE201604]
{"title":"Recent Research in Solvent Extraction of Platinum Group Metals","authors":"H. Narita, Tomoya Suzuki, R. Motokawa","doi":"10.2320/JINSTMET.JE201604","DOIUrl":"https://doi.org/10.2320/JINSTMET.JE201604","url":null,"abstract":"Most of the refineries for platinum group metals (PGMs) in Japan have adopted solvent extraction methods for mutual separation of PGMs. Few effective extractants for industrial use have been found although some industrial processes were established in 1970's. Recently, some compounds have been reported as candidates for practical PGM extractants in addition to new concepts for PGM extraction mechanisms. In this review article, we present well–known PGM recovery processes based on solvent extraction, industrial extractants and their properties, and conventional extraction mechanism for PGMs. Additionally, we discuss recent interesting extraction systems (amide–type compounds and ionic liquid) and then introduce new extraction concepts based on the specific interactions at the outer–sphere of a metal complex in the organic phase. [doi:10.2320/jinstmet.JE201604]","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"139 1","pages":"157-167"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74281207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.2320/JINSTMET.J2016064
K. Nakasa, A. Yamamoto, T. Kubo, Rongguang Wang, T. Sumomogi
1High-Tech Research Center, Hiroshima Kokusai Gakuin University, Hiroshima 7390321 2Asahi Surface Tec. LLC, Higashi-Hiroshima 7390024 3Center for General Education, Hiroshima Kokusai Gakuin University, Hiroshima 7390321 4Department of Mechanical System Engineering, Faculty of Engineering, Hiroshima Institute of Technology, Hiroshima 731-5193 5Department of Manufacturing Engineering, Faculty of Engineering, Hiroshima Kokusai Gakuin University, Hiroshima 7390321
{"title":"Formation of Fine Protrusions by Sputter Etching of Commercially Pure Titanium","authors":"K. Nakasa, A. Yamamoto, T. Kubo, Rongguang Wang, T. Sumomogi","doi":"10.2320/JINSTMET.J2016064","DOIUrl":"https://doi.org/10.2320/JINSTMET.J2016064","url":null,"abstract":"1High-Tech Research Center, Hiroshima Kokusai Gakuin University, Hiroshima 7390321 2Asahi Surface Tec. LLC, Higashi-Hiroshima 7390024 3Center for General Education, Hiroshima Kokusai Gakuin University, Hiroshima 7390321 4Department of Mechanical System Engineering, Faculty of Engineering, Hiroshima Institute of Technology, Hiroshima 731-5193 5Department of Manufacturing Engineering, Faculty of Engineering, Hiroshima Kokusai Gakuin University, Hiroshima 7390321","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"10 1","pages":"211-220"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74744571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.2320/JINSTMET.JAW201607
Youhei Hirohata, H. Ota, T. Haruna, K. Noda
This paper aimed to investigate conditions for pit initiation on type 304 stainless steel under MgCl2 solution layer in atmospheric environment using a CCD camera system and a surface potential measurement equipment. A droplet of dilute MgCl2 solution was put on the specimen. The specimen was set in the chamber with a relative humidity of 33% in order to make the droplet dry into the layer. The CCD camera system was employed to observe the change in the shape of the droplet and in the specimen surface during the drying process. In addition, the surface potential measurement equipment was applied for monitoring the surface potential of the specimen with the layer. When the droplet of dilute solution became thin and saturated, pitting corrosion occurred and the surface potential rapidly lowered. By contrast, thick and saturated layer did not induce pitting corrosion and the surface potential indicated the relatively low and steady. Therefore, it was revealed that the atmospheric corrosion occurred on the steel under saturated MgCl2 solution layer whose thickness less than 0.2 mm. [doi:10.2320/jinstmet.JAW201607]
{"title":"Influences of Concentration and Thickness of MgCl 2 Solution Layer on Pit Initiation of Type 304 Stainless Steel in Atmospheric Environment","authors":"Youhei Hirohata, H. Ota, T. Haruna, K. Noda","doi":"10.2320/JINSTMET.JAW201607","DOIUrl":"https://doi.org/10.2320/JINSTMET.JAW201607","url":null,"abstract":"This paper aimed to investigate conditions for pit initiation on type 304 stainless steel under MgCl2 solution layer in atmospheric environment using a CCD camera system and a surface potential measurement equipment. A droplet of dilute MgCl2 solution was put on the specimen. The specimen was set in the chamber with a relative humidity of 33% in order to make the droplet dry into the layer. The CCD camera system was employed to observe the change in the shape of the droplet and in the specimen surface during the drying process. In addition, the surface potential measurement equipment was applied for monitoring the surface potential of the specimen with the layer. When the droplet of dilute solution became thin and saturated, pitting corrosion occurred and the surface potential rapidly lowered. By contrast, thick and saturated layer did not induce pitting corrosion and the surface potential indicated the relatively low and steady. Therefore, it was revealed that the atmospheric corrosion occurred on the steel under saturated MgCl2 solution layer whose thickness less than 0.2 mm. [doi:10.2320/jinstmet.JAW201607]","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"24 1","pages":"115-119"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74857180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.2320/JINSTMET.J2017044
Mitsuaki Adachi, M. Yuasa, H. Miyamoto, H. Fujiwara, M. Hatano
Equal–channel angular pressing (ECAP) was applied to hot–bands by one pass prior to cold–rolling and annealing in order to modify the texture, and improve the ridging and formability of ferritic stainless steel sheets. The present study focuses on the effect of initial grain size before ECAP, using the samples having extremely large grain size of 210 μm and smaller ones of 30 μm. The final grain sizes of cold–rolled and annealed sheets were about 30 μm for both processes. It was found that Rankford value (r–value) of large grain size was higher compared with that of smaller one while ridging was alleviated in the latter. The recrystallization temperature of cold–rolled sheets was about 50°C lower in the larger grain size. It is considered that higher density of grain–scale shear bands in the sample of larger grain size promotes recrystallization and reduction of <001>//ND grains and increase <111>//ND grains, resulting in higher r–value. However, coarser arrangement of <001>//ND colony parallel to the rolling direction in large grain size may causes higher ridging in spite of the lower fraction <001>//ND grains. [doi:10.2320/jinstmet.J2017044]
{"title":"Effect of Initial Grain Size Prior to ECAP-Cold Rolling Processing on the Riding and Formability of Ferritic Stainless Sheets","authors":"Mitsuaki Adachi, M. Yuasa, H. Miyamoto, H. Fujiwara, M. Hatano","doi":"10.2320/JINSTMET.J2017044","DOIUrl":"https://doi.org/10.2320/JINSTMET.J2017044","url":null,"abstract":"Equal–channel angular pressing (ECAP) was applied to hot–bands by one pass prior to cold–rolling and annealing in order to modify the texture, and improve the ridging and formability of ferritic stainless steel sheets. The present study focuses on the effect of initial grain size before ECAP, using the samples having extremely large grain size of 210 μm and smaller ones of 30 μm. The final grain sizes of cold–rolled and annealed sheets were about 30 μm for both processes. It was found that Rankford value (r–value) of large grain size was higher compared with that of smaller one while ridging was alleviated in the latter. The recrystallization temperature of cold–rolled sheets was about 50°C lower in the larger grain size. It is considered that higher density of grain–scale shear bands in the sample of larger grain size promotes recrystallization and reduction of <001>//ND grains and increase <111>//ND grains, resulting in higher r–value. However, coarser arrangement of <001>//ND colony parallel to the rolling direction in large grain size may causes higher ridging in spite of the lower fraction <001>//ND grains. [doi:10.2320/jinstmet.J2017044]","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"28 1","pages":"52-57"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74922868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：