巻号一覧
60 巻, 11 号
November
選択された号の論文の9件中1～9を表示しています
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研究論文
研究論文
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Atsushi HIBINO, Osamu KOMAKI2013 年 60 巻 11 号 p. 441-450
発行日: 2013/11/15
公開日: 2014/01/22
ジャーナル オープンアクセスABSTRACT
In order to improve the mechanical properties of TiAl intermetallic compound by combustion synthesis, it is also effective to synthesize composite Ti – Ni – Al intermetallic compound by the addition of Ni. However, in combustion synthesis of Ti – Ni – Al system, difficulty of reaction control of elemental Ti/Ni/Al mixed powder brought meltdown or poor sintering to the synthesized product. In this paper, by developing two-step combustion synthesis process, fabrication of Ti – Ni – Al intermetallic compound was examined. Namely, in 1st-step combustion synthesis, TiAl and Ni3Al compound powders were composed. In 2nd-step combustion synthesis, by mixing TiAl, Ni3Al, Ti, Ni, and Al powders, Ti – Ni – Al intermetallic compound was synthesized by the combustion synthesis reaction. By using the two-step combustion synthesis, dense Ti – Ni – Al intermetallic compound could be fabricated. The microstructure of the product consisted of about 20 µm crystal grain. From SEM – EDX analyses, it was found that the compound phases were TiNi2Al phase (τ4) and TiNiAl2 phase (τ2). Since Ti – Ni – Al intermatallic compound can be synthesized easily by the two-step combustion synthesis, development of future investigation of the ternary intermetallic compound material is expected.抄録全体を表示PDF形式でダウンロード (1325K)
特集：各種粉末に対する焼結技術と焼結機構およびその新しい展開
総報
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川崎 亮2013 年 60 巻 11 号 p. 452-
発行日: 2013/11/15
公開日: 2014/01/22
ジャーナル オープンアクセスPDF形式でダウンロード (134K)
受賞記念講演
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－高強度黄銅合金粉末押出材における添加元素の挙動と機械的特性－今井 久志, 李 樹豊, 上坂 美治, 近藤 勝義2013 年 60 巻 11 号 p. 453-459
発行日: 2013/11/15
公開日: 2014/01/22
ジャーナル オープンアクセスABSTRACT
In this study, the effects of additive alloying elements on microstructure and mechanical properties of Cu – 40 % Zn alloy prepared by powder metallurgy (P/M) process were investigated. Raw Cu – 40Zn – Cr – Ti – Fe – Sn brass powders, having a single beta phase, were made by water-atomization process. Grain size of brass powder was smaller with increasing the solid solution of alloying elements. The brass alloy powder billet consolidated by sintering at less than 873 K had high solid solution of alloying elements. P/M Cu – 40Zn – 0.8Cr0.3Fe0.6Sn0.6Ti extruded material at 773 K showed 751 MPa UTS, 582 MPa YS and, 17.0 % elongation. SEM – EDS, XRD and TEM analysis clarified this P/M high strength brass alloy was mainly strengthened by solid solution mechanism of the alloying elements such as Cr and Ti which had a low solid solubility limit in brass. Extruded material of P/M Cu – 40Zn – 0.8Cr0.3Fe0.6Sn0.6Ti with 1.0 mass% graphite particles had both high strength and suitable machinability by solid solution of alloying elements due to no formation of hard carbides.抄録全体を表示PDF形式でダウンロード (1523K)
解説
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中本 貴之, 白川 信彦, 乾 晴行2013 年 60 巻 11 号 p. 460-466
発行日: 2013/11/15
公開日: 2014/01/22
ジャーナル オープンアクセスABSTRACT
Optimum conditions for laser irradiation to achieve fully dense high-carbon steel selective laser melting (SLM) specimens have been investigated as a function of carbon content in steel powders using steel powders with different carbon contents of 0.33 − 1.04 mass% C. Full densification is easily achieved by SLM processing for all high-carbon steel powders. The energy density during the SLM process necessary for full densification decreases as the carbon content increases from 400 J/mm3 for 0.33 and 0.49 mass% C to 267 J/mm3 for 0.76 and 1.04 mass% C, which is considered to be attributable to the increased wettability of molten Fe – C alloys on steel powders and sintered specimens for the higher carbon contents. Moreover, SLM specimens that are strong enough to be used as stamping dies are produced by plasma nitriding specimens that have been sintered from an alloyed steel powder, JIS-SCM430. After plasma nitriding, the surfaces of the specimens have a compound layer, the so-called “white layer”, composed of ε – Fe2−3N and γ’– Fe4N. The surface hardness of the specimens plasma nitrided at 773 K and 823 K are about 680 HV and 600 HV, respectively and are much higher than that of the original SLM specimens – about 330 HV –.抄録全体を表示PDF形式でダウンロード (1320K)
研究論文
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三本 嵩哲, 李 樹豊, 梅田 純子, 近藤 勝義2013 年 60 巻 11 号 p. 467-474
発行日: 2013/11/15
公開日: 2014/01/22
ジャーナル オープンアクセスABSTRACT
TiH2 raw powders were directly consolidated by cold pressing, sintering and hot extrusion to fabricate pure Ti materials. The residual hydrogen content depended on the sintering temperature, and showed a significant effect on α/β phase transformation during hot extrusion. When 0.33 mass% hydrogen was contained in the sintered compact, α→β phase transformation occurred completely at extrusion temperature of 1073 K, and resulted in the formation of <0001>α texture of the extruded Ti material. This texture was completely different from that of the conventional extruded Ti materials (<10 – 10>α texture) with very few contents of hydrogen. The former indicated extremely high tensile strength (σ) of 959 MPa and enough elongation (δ) of 27.6 % compared to P/M extruded pure Ti materials with σ = 634 MPa and δ = 29.9 %.抄録全体を表示PDF形式でダウンロード (1955K) -
笠井 実, 日比野 敦, 屋代 春樹2013 年 60 巻 11 号 p. 475-481
発行日: 2013/11/15
公開日: 2014/01/22
ジャーナル オープンアクセスABSTRACT
In the fields of an eco-friendly automobile, an advanced industrial machine, and a precision electronic device, controlling of vibrational behavior of the sintering parts obtained from powder metallurgy is required. In this paper, the vibration behavior of porous material made by powder metallurgy is investigated by a FFT analyzer. Pure Cu powders (Average particle size: 36 µm, 89 µm) are used as initial substances. The powder is compressed by a metal die with 100～200 MPa, and a plate shaped Cu compact is made. Using a high vacuum furnace, the green compact is heated from room temperature with 10 ˚C/min, and is sintered at 700～1000 ˚C for 1 hour. By changing the powder particle size, the compaction pressure, and the sintering temperature, some kinds of sintered Cu porous plates which had various microstructures, varied porosity, and different mechanical properties are sintered. For the sintered Cu porous plate obtained, microstructure observation, tensile test and vibration test are performed.
The vibration behavior of the sintered Cu porous plates is analyzed from the frequency response function of the FFT analyzer. The damping coefficient of the sintered Cu porous plate depends on the porosity and the open pore ratio. The vibrational behavior of the sintered material is able to be easily measured by FFT analyzer.抄録全体を表示PDF形式でダウンロード (1070K) -
日比野 敦, 山崎 遼平, 白石 祐太郎2013 年 60 巻 11 号 p. 482-489
発行日: 2013/11/15
公開日: 2014/01/22
ジャーナル オープンアクセスABSTRACT
Gas release behavior of alloyed steel powder during sintering process was analyzed by gas chromatography. In our previous paper, gas release behaviors of Fe powder, Fe – 3 % Cr powder, Fe – 4 % Ni powder and Fe – Cr – Ni powder were investigated. From the investigation, it was found that Cr component in the alloyed steel powder reduced CO2 gas release, and that Ni component increased H2O gas release from the alloyed steel powder. However, since there were too few experimental data, it was lacking in reliability of the experimental result. Therefore, gas release behaviors of Fe powder, Fe – 1.5 % Cr powder, Fe – 2 % Ni powder and Fe – 1.5 % Mo powder were measured in this paper. The gas release behaviors of Fe – 1.5 % Cr powder, Fe – 2 % Ni powder and Fe – 1.5 % Mo powder were similar to them of Fe – 3 % Cr powder, Fe – 4 % Ni powder and Fe powder respectively. In Fe – 1.5 % Cr powder, the Cr component reduced CO2 gas release, and in Fe – 2 % Ni powder, the Ni component increased H2O gas release. Therefore, the effect of the alloy component against the gas release behavior was cleared from the present investigation. Additionally, thermodynamic analysis was attempted for the CO2 release behavior of Fe powder.抄録全体を表示PDF形式でダウンロード (1012K)
本会記事
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2013 年 60 巻 11 号 p. Pref11_1-
発行日: 2013/11/15
公開日: 2014/01/22
ジャーナル オープンアクセスPDF形式でダウンロード (900K)
訂正
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―元素物質，AB型化合物，鉄系および銅系化合物―巻野 勇喜雄, 吉村 一良2013 年 60 巻 11 号 p. 491-
発行日: 2013/11/15
公開日: 2014/01/22
ジャーナル オープンアクセス訂正;
本誌第59巻第12号に掲載の巻野勇喜雄氏，吉村一良氏の研究論文「超伝導臨界温度と擬ポテンシャル半径の関係―元素物質， AB型化合物，鉄系および銅系化合物―」につきまして，英文題目に脱字がございました.下記の通り訂正します.
p.665英文題目
(誤) Relation between Critical Temperature and Pseudopotential Radi — Elements，AB Compounds，Fe-and Cu-based Compounds —
(正) Relation between Critical Temperature and Pseudopotential Radii — Elements，AB Compounds，Fe-and Cu-based Compounds —抄録全体を表示PDF形式でダウンロード (153K)
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