巻号一覧
34 巻, 8 号
選択された号の論文の7件中1～7を表示しています
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石井 勇五郎1965 年 34 巻 8 号 p. 734-744
発行日: 1965/08/25
公開日: 2011/08/05
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吉識 雅夫, 金沢 武, 越賀 房雄1965 年 34 巻 8 号 p. 745-752
発行日: 1965/08/25
公開日: 2011/08/05
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長田 恭一, 奥 武1965 年 34 巻 8 号 p. 753-772
発行日: 1965/08/25
公開日: 2011/08/05
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根本 正, 正岡 功, 田野崎 和夫1965 年 34 巻 8 号 p. 773-784
発行日: 1965/08/25
公開日: 2011/08/05
ジャーナル フリー50-60 kg/mm2 class four high strength steels and their welded joints were heated for various time at various temperatures 300-550°C in 200 kg/cm2 hydrogen, and the changes of their mechanical properties and structures were studied at room temperaure. The process of embrittlement in longtime testing and embrittlement limits of these steeles caused by heating in hydrogen at high temperatures and high pressures were discussed.
The results obtained were as follows.
(1) Steels which were heated at high temperatures and high hydrogen pressures became brittle and remarkably decreased the mechanical strength and the ductility, besides both hardness and carbon content decreased, many inner cracks initiated and fissured at grain boundaries. Then this grain boundaries fissuring gave rise to deterioration of materials.
(2) An addition of carbide forming elements, Mo and Cr, and the heat treatment as normalizing and tempering increase the resistanse to hydrogen attack and raise embrittlement limits.
(3) The welded joints are easy to become brittle in the heat-affected zone, because of the coarse grain size, therefore they decrease more severely the resistanse to hydrogen attack than the base steels.
(4) At a constant temperature and pressure, it requires an incubation time (t) to become brittle and a plot of In t vs. reciprocal of heating absolute tempereture holds a straight line relationship.
(5) According to this straight line relationship, it is possible to extrapolate a critical temperature of embrittlement limits at a long time about each meterial.
(6) The activation energies of embrittlement on the kinetics of hydrogen attack were calculated, but they were fairely larger than each activation energy for diffusion of hydrogen and carbon through iron. Therefore, the process of hydrogen attack will not be the hydrogen and carbon diffusion-controlled behavior. Also, it is considered that the embrittlement process is related to the temperature dependence of the movement of dislocations and vacancies in the prepicitation and crack growth process of the methane gas in carbide-hydrogen reactions. But it will be necessary to make more detailed experiments to explain the mechanism of it.抄録全体を表示PDF形式でダウンロード (6500K) -
江国 定明1965 年 34 巻 8 号 p. 785-793
発行日: 1965/08/25
公開日: 2011/08/05
ジャーナル フリーIn this study, I investigated about corrosion loss of various filler metals with Ag-P-Cu, Ag-Cu-Cd-Zn and Cu-Zn systems and about the change of tensile strength of brazed copper joints with various filler metals in various corrosive solutions at room temperature.
The results of investigation are concluded as follows;
1) When immersed in 10%H2SO4 solution, Ag-P-Cu systems are better than Ag-Cu-Cd-Zn and Cu-Zn systems on corrosion loss and the decrease of tensile strength of brazed copper joints.
2) When immersed in 10%HCl solution, the corrosion loss of these filler metals are less than pure copper, and its of Ag-Cu-Cd-Zn and Ag-P-Cu systems.
3) In 10%NH4OH solution, Ag-P-Cu systems are very corrosive in comparison with Ag-Cu-Cd-Zn and Cu-Zn systems.
4) In 5%NaCl solution, the corrosion resistance of Ag-Cu-Cd-Zn systems are better than the other systems.
5) When immersed in saturated H2S solution, the filler metals contained phosphor are corrosive than the other filler metals.抄録全体を表示PDF形式でダウンロード (9471K) -
塩谷 敏祐, 山田 銑一, 葛谷 豊1965 年 34 巻 8 号 p. 794-800
発行日: 1965/08/25
公開日: 2011/08/05
ジャーナル フリーMany reports have recently been made concerning to friction welding, however we seldom find reports about influences which each factor of that welding gives to material. That's why we have conducted how the basic factors of friction welding, which means heating pressure, forging pressure, revolution speed, material diameter, surface circumstance and so on, have an effect on weld joint. Our results are as follows :
(1) When heating pressure and forging pressure are high and their proportion is large, excellent weld joint can be made irrespective of small upset, however such an effect is rather doubtful when the proportion goes over a certain figure.
(2) Revolution speed does not affect so much upon joint, but the speed should be decided, considering production efficiency, as upset speed depends on its material. Influence on weld material diameter, depends on sliding speed as well as revolution speed, and when material diameter is big, revolution speed should be low.
(3) Surface circumstances of material to be welded effect upon early calorification conditions on welding process and the minimum upset becomes bigger, which is not broken on weld interface, on bad surface circumstances.抄録全体を表示PDF形式でダウンロード (1848K) -
高張力鋼溶接部のルート割れに関する研究(第5報)稲垣 道夫, 中村 治方, 鈴木 春義1965 年 34 巻 8 号 p. 801-810
発行日: 1965/08/25
公開日: 2011/08/05
ジャーナル フリーThe effects of restraining force on root cracking of various high strength steel welds, ranging rom 50 to 80 kg/mm2, were investigated by the NRIM TRC test (Tensile Restraint Cracking test). Crittical transverse tensile stress, which is necessary to initiate a root crack in the first layer of a weld, was determined for each weld under several welding conditions. Effects of cooling process below 300°C, preheating temperature and hydrogen content on critical stress were discussed. The conclusions obtained in the study are summarized as follows:
(1) The behavior of root cracking in the TRC tests on high strength steel welds is a delayed failure type and practically identical to that in the slotted groove restraint cracking tests
(2) From the TRC tests of various high strength steels of tensile strength grades of HT 50 to HT 80, the values of critical tensile stresses were obtained below which no root cracking occurred.
(3) The value of critical tensile stress is generally increased with an increase of weld heat input or preheating temperature and a decrease of diffusible hydrogen content. The value is generally greater, the lower is the tensile strength of the steel.
(4) The welding conditions and preheating temperatiure for which the TRC critical tensile stress is approximately equal to the yield stress of weld metal, are satisfactory to prevent root cracking in slotted groove restraint cracking tests.
(5) The cooling process below 300°C has considerable effect on the value of critical tensile stress of HT 80 steel welds, but liftle on HT 60 steel welds. Faster cooling is harmful.
(6) The correlation among the value of critical tensils stress σc, (kg/mm2), preheating temperature Τ0 (°C) and diffusible hydrogen content [Η] (cc/100 gr) of an HT 80 steel 8 E weld is summarized by the following experimental formula :
logσc=1.845-(200-Τ0){0.02log([Η]+1)-0.003}
(7) The correlation, like as above formula, in an HT 60 steel 6 F weld is summarized by the following experimental formula :
logσc=1.64-0.156log([Η]+1)+0.001Τ0
(8) A little content of diffusible hydrogen is detrimental to root cracking in HT 80 welds, but not in HT 60 welds, and preheating is much more effective for the prevention of root cracking in HT 80 welds than in HT 60 welds.抄録全体を表示PDF形式でダウンロード (3788K)
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