巻号一覧
後続誌
66 巻, 3 号
選択された号の論文の8件中1～8を表示しています
- |<
- <
- 1
- >
- >|
研究論文
-
田村 朗, 新田 誠也, 苧野 兵衛1994 年 66 巻 3 号 p. 187-192
発行日: 1994/03/25
公開日: 2011/06/15
ジャーナル フリーHigh chromium white cast irons are now being produced in large tonnages for the crushing, grinding and mineral handling industries because of their excellent resistance to abrasion. This alloy have been used more widely in the austenite destabilization and air hardening conditions when a predominantly martensitic matrix structure is obtained. However, this alloy can be used in the as cast condition, when the matrix contains large amounts of austenite, which is obtained by rapid cooling of casting after solidification. The effect of holding time in the sand mold from pouring to shakeout is discussed in relation to microstructure, hardness, mechanical properties and abrasive wear resistance on as cast and air hardened 3 mass % C-25 mass % Cr white cast irons. Castings shaked out up to 1 hour after solidification result in the predominantly austenitic structure without any transformation to pearlite or bainite, consequently have high hardness, excellent resistance to abrasion and good hardenability.抄録全体を表示PDF形式でダウンロード (720K) -
内田 秀, 増田 一郎1994 年 66 巻 3 号 p. 193-198
発行日: 1994/03/25
公開日: 2011/06/15
ジャーナル フリーIn order to improve plug life for hot rolling of steel alloy pipes, the causes of damage and the effect of bonded mild steel at the top of inlet steel alloy were investigated. The following results were obtained ; (1) In piercing steel alloy, which had high deformation resistance and high friction coefficient, initial scale of plug was consumed and then plug was damaged by elevated temperature and surface metal flow. (2) The damage of plug was prevented by bonding mild steel at the top of steel alloy on the experimental mills. (3) Piercing top loads were lessened by about 15 % by that method.抄録全体を表示PDF形式でダウンロード (694K) -
桑野 正司, 大城 桂作, 沢本 章1994 年 66 巻 3 号 p. 199-204
発行日: 1994/03/25
公開日: 2011/06/15
ジャーナル フリーInfluences of 1∼3 mass % Mn and combined additions of 1 mass % Mn and 1∼2 mass % Ni or 1∼2 mass % Cu were investigated on hardenability of cast iron containing 15 mass % Cr and 1.6∼3.6 mass % C by using a dilatometer. Continuous cooling transformation diagrams and critical cooling rates of pearlite and bainite transformations were evaluated for irons destabilized at 1273 K for 6 ks and 360 ks. Ms temperature and the matrix hardness of quenched iron become lower with the increase in Mn, Ni and Cu contents, The higher Cr/C ratio of alloy also increases these values. A multiple regression analysis reveals the dependences of Ms temperature and the critical cooling rates on Cr/C ratio and alloying elements.抄録全体を表示PDF形式でダウンロード (649K) -
上野 博志, 萩野谷 生郎1994 年 66 巻 3 号 p. 205-210
発行日: 1994/03/25
公開日: 2011/06/15
ジャーナル フリーThe process of Sr-decrease in molten Al-Si-Mg alloy was studied by emission spectrochemical analysis of Sr in molten metal, X-ray fluorescence analysis of dross formed at degassing process and SEM observation of surface film on molten metal. It was decided that there are three processes of Sr-decrease ; (1) Mg and Sr, melted uniformly in molten metal, is oxidized simultaneusly and forms a surface film. (2) Sr combined with hydrogen gas and oxide in molten metal comes up to the surface and separates from the molten metal. (3) Ar-degassing treatment promotes the second process. Ar-gas also breaks the surface film and more promotes oxidation Sr.抄録全体を表示PDF形式でダウンロード (770K) -
駒崎 徹, 松浦 一也, 西 直美1994 年 66 巻 3 号 p. 211-216
発行日: 1994/03/25
公開日: 2011/06/15
ジャーナル フリーVariation of molten metal pressure within a die cavity has been analyzed for AD 10.1 alloy and pure metals (aluminum, zinc, bismuth, tin and lead) using 90 metric tone locking force cold chamber type diecasting machine. The wave form of pressure is divided into two regions. In the first region, the molten metal pressure is keeping at constant immediately after injection of molten metal into die cavity. In the second region, the pressure is changing after the first region. The transition from the first region to second is caused by solidifying of gate. The wave form of second region depends on shrinkage rate of solidification. In the case of metal that shrink on solidifying, the pressure decreases with time at the second region. Degree of decreasing pressure becomes large with increasing shrinkage rate of solidification. On the other hand, the pressure of molten metal such as bismuth that expands on solidifying increase with time.抄録全体を表示PDF形式でダウンロード (600K) -
星野 和義, 神山 勝也, 坂井 卓爾, 黒沢 達也, 大谷 利勝1994 年 66 巻 3 号 p. 217-222
発行日: 1994/03/25
公開日: 2011/06/15
ジャーナル フリーStructures of 99.9 % pure zinc castings solidified under vibration by an alumina oscillator were examined. The vibration amplitude were 4, 8 and 16 mm and the frequency were 2.5, 5.0 and 7.5 Hz. Effects of the pouring temperature, the vibrating period and the wiping of oscillator on structures of pure zinc castings were investigated. The vibration at a large amplitude and at a high frequency decrease the area of columnar crystals and increase that of equiaxed crystals, and refine the grain size of both crystals. When the pouring temperature is low, columnar crystals are refined but the area of equiaxed crystal is decreased. The vibration during liquid phase has little influence on the structure of pure zine casting. By wiping off of crystals on the oscillator, a remarkable refining of crystals is attained.抄録全体を表示PDF形式でダウンロード (851K)
技術報告
-
山内 康仁, 矢田 由夫, 升田 隆一, 安田 辻彦, 浜島 和雄, 国米 洋1994 年 66 巻 3 号 p. 223-228
発行日: 1994/03/25
公開日: 2015/01/21
ジャーナル フリーPDF形式でダウンロード (2716K)
解説
-
岡倉 常之1994 年 66 巻 3 号 p. 229-234
発行日: 1994/03/25
公開日: 2015/01/21
ジャーナル フリーPDF形式でダウンロード (3408K)
- |<
- <
- 1
- >
- >|