巻号一覧
38 巻, 11 号
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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鈴木 康夫, 平尾 正志1988 年 38 巻 11 号 p. 697-702
発行日: 1988/11/30
公開日: 2008/07/23
ジャーナル フリーThe effects of additing vanadium carbide (VC) and/or titanium nitride (TiN) to sintered high speed steel tools are described. Results are presented for Al-8%Si alloy and Al-25%Si alloy in turning tests. Following conclusions are obtained.
(1) Wear resistance of the high speed steel tools increases with increase in the amount of VC and/or TiN.
(2) The improvement of wear resistance is due to hard VC or TiN particles which are resisting and remaining on the tool edge against the scratching by hard Si particles in the work materials.
(3) Addition of VC is more effective than that of TiN.
(4) The difference in wear resistance is ascribed to the difference in frictional characteristics or affinity between Si and VC or TiN.
(5) The addition of VC or TiN has no deficiency from the view points of cutting force, surface roughness and chip treatment.抄録全体を表示PDF形式でダウンロード (1127K) -
李 正吉, 北原 晃, 坂本 満, 長田 純夫1988 年 38 巻 11 号 p. 703-709
発行日: 1988/11/30
公開日: 2008/07/23
ジャーナル フリーSponge cast aluminum alloy (SCA) can be produced by a new process where NaCl particles are sintered first, molten aluminum is forced to fill the pores of the sinter, and then NaCl is dissolved away from the NaCl-Aluminum composite in the water. The liquid phase sintering of NaCl particles covered with fine KCl powders has the advantages of lowering the sintering temperature and saving the sintering time, because KCl can decreases the melting temperature of NaCl through reaction and has a wide range of solid-liquid coexistance in its phase diagram. Another advantage of liquid phase sintering is the high permeability of the resulting SCA. The reason for this is thought that the liquid phase gets together at the contact points of NaCl particles leading to the wide connection of NaCl particles each other.抄録全体を表示PDF形式でダウンロード (2121K) -
林 水根, 金子 純一, 菅又 信1988 年 38 巻 11 号 p. 710-716
発行日: 1988/11/30
公開日: 2008/07/23
ジャーナル フリーRapidly solidified flakes of 2219 aluminum alloys containing transition metals were produced by atomizing the alloy melt and subsequent splat quenching onto a water-cooled copper single roll. Consolidation of these flakes was done by cold pressing, degassing and hot extrusion at a reduction ratio of 25 to 1. As splat-quenched flakes showed cellular structures, consisting of primary α phase and eutectic. The hardness of flakes and P/M materials increased with the addition of transition metals due to fine dispersion of their eutectic compounds. However, P/M materials with higher addition of transition metals showed much lower age hardening than 2219 alloy, and this was attributed to lower solid solubility of Cu due to formation of compounds between Cu and transition metals. Mn was most effective for strengthening 2219 alloy by the addition of transition metals. Tensile strength of T6 materials with 2wt% Mn addition was 476MPa, and that of F material with 6wt% Mn addition was 536MPa. Furthermore, Mn bearing materials showed appreciably higher fatigue strength than conventional 2219 alloy in torsional fatigue tests.抄録全体を表示PDF形式でダウンロード (1417K) -
清水 保雄, 清野 次郎, 佐藤 元太郎, 宮地 克嘉, 市川 武司, 大野 茂久1988 年 38 巻 11 号 p. 717-722
発行日: 1988/11/30
公開日: 2008/07/23
ジャーナル フリーTexture and conical cup value (C. C. V.) of 1050 aluminum sheets were investigated. Secondary cold cross rolling was applied in order to weaken the cube texture which has been known to be unfavorable for metal sheet formability. Primarily straight-rolled sheets were subjected to secondary cross rolling successively along the transverse direction to primary rolling. Experimentally remodelled reversing cross rolling mill from common type of a two-high mill was used to perform the secondary cross rolling. 5-15% secondary cross rolling was exerted to develope the rolled texture composed of preferred orientation {034}<986>. Resulting recrystallized texture obtained from it secondarily cross-rolled included several preferred orientations {034}<986>, {5 10 31}<5 44 15> and {053}<135>, instead of cube orientation. Consequently, weakening the cube texture by means of secondary cross rolling was capable of improving the C. C. V. and reducing plastic anisotropy of the sheets.抄録全体を表示PDF形式でダウンロード (751K) -
小林 俊郎, 新家 光雄, 高林 幸央, 河村 繁1988 年 38 巻 11 号 p. 723-730
発行日: 1988/11/30
公開日: 2008/07/23
ジャーナル フリーA rather good correlation between fracture properties obtained from tear test fracture toughness value JIC has already been reported in the previous study. A method of estimating fracture toughness parameters directly from the tear test is studied and presented in this study with a help of the finite element analysis. Tear test is carried out using specimen with a deep notch ratio of a/W=0.3 which is recommended from the result of finite element analysis, while its other geometry is held same as that of the standard tear test one. In such test, load-load line deflection curve and crack initiation point are recorded. Then, the fracture toughness JIC can be successfully evaluated by putting the area under the load-deflection curve up to the crack initiation point into the Rice's simple J integral estimation formula. Crack initiation point can be experimentally detected by the DC electrical potential method or the compliance changing rate method developed by the authors. It is also shown that crack initiation point may be also detected by the maximum load if side grooves are added to the specimen. Moreover, it is verified that crack extension resistance, i.e., tearing modulus Tmat, from the tear test coincides with that obtained from the test of CT specimen.抄録全体を表示PDF形式でダウンロード (898K) -
Taichi SATO1988 年 38 巻 11 号 p. 731-739
発行日: 1988/11/30
公開日: 2008/07/23
ジャーナル フリーIn order to prepare pure nordstrandite of aluminum hydroxide, gelatinous aluminum hydroxides prepared from aqueous solutions of chloride or nitrate of aluminum on the addition of alkali such as aqueous solutions of sodium or ammonium hydroxides are aged under different conditions for a given period at a selected temperature: the precipitates are aged in the mother liquors; the precipitates are washed by water and then aged in ammonia liquors or aqueous solutions of ethylenediamine. As the result, it is found that generally nordstrandite is not formed by the ageing in the mother liquor except for the addition of ethylenediamine as an alkaline solution; nordstrandite is formed as a mixture of bayerite and/or hydrargillite by the ageing in ammonia liquor, and pure nordstrandite is formed by ageing in aqueous solutions of ethylendiamine.抄録全体を表示PDF形式でダウンロード (834K) -
福永 秀春1988 年 38 巻 11 号 p. 740-747
発行日: 1988/11/30
公開日: 2008/07/23
ジャーナル フリーPDF形式でダウンロード (1553K) -
大堀 紘一1988 年 38 巻 11 号 p. 748-763
発行日: 1988/11/30
公開日: 2008/07/23
ジャーナル フリーPDF形式でダウンロード (2630K) -
磯谷 三男1988 年 38 巻 11 号 p. 764-765
発行日: 1988/11/30
公開日: 2008/07/23
ジャーナル フリーPDF形式でダウンロード (234K)
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