All issues
Volume 1954 (1954)
- Issue 13 Pages 3-
- Issue 12 Pages 5-
- Issue 11 Pages 3-
- Issue 10 Pages 3-
Volume 1954, Issue 11
Displaying 1-13 of 13 articles from this issue
- |<
- <
- 1
- >
- >|
-
KIKUO YASUDA1954 Volume 1954 Issue 11 Pages 3-9
Published: June 10, 1954
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (1157K) -
REPORT1 ON THE CONTOUR, MACROSTRUCTURE AND SEGREGATION ZONENAMIO KAWASHIMA, YUZO NAKAMURA, MASAO SATO1954 Volume 1954 Issue 11 Pages 10-16
Published: June 10, 1954
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSRecently it was cleared up that there is a segregation zone which extends to some 20mm depth below the skin of continuously cast pure aluminium ingot. The exudation phenomenon is to be found in general inverse segregation where the contraction gaps are marked during casting, and it can also be attributed to periodic reheating of the ingot surface.
The authors also investigated the contour, the macrostructure and the segregation zone of continuously cast pure aluminium ingots. (99.9, 99.7, 99.5, 99.0%Al) with the following results;
1. There is a segregation zone showing a half sine curve front close to the ingot surface which extends to 10mm depth below the shin of high-purity aluminium ingot.
2. There is a macroscopic non-uniformity of the structure even in the interior of the pure aluminium ingot whose purity is less than 99.7%.
3. The maximum difference of iron content below the shin of ingot wos ascertained to be so small as 0.003% and 0.037% in 99.9% and 99.0%Al respectively.
4. The correlations between hardness iron content and segregation zone are not always coincided, by this may be also due to the grain size the internal stress and the sampling method for chemical analysis.
5. It is recommended in practice to have the sheet ingot surface scalped as deep as 15mm to eliminate the segregation zone for the fine uniform surface of sheet.View full abstractDownload PDF (2298K) -
1954 Volume 1954 Issue 11 Pages 16
Published: 1954
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSDownload PDF (135K) -
PART 2 IN REGARD TO ELECTRICAL CONDUCTIVITY AND TENSILE STRENGTH OF AL WIRE DRAWN WITHOUT ANNEALING--GOHEI MARUKAWA, TAKASHI OIKAWA1954 Volume 1954 Issue 11 Pages 17-20
Published: June 10, 1954
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSIn the case of making Al wire for conductor materials, hot rolled bar is usually annealed for 1 hour at the temperatur of 320°C. But this annealing procedure causes the partial softening, so that for carrying out the cold drawing to the high reduction degrees, we must derive a high tensile strength. And to acquire the uniformity of products' property, partial softening is undesirable, hence in the recent days this annealing process is abbreviated by some factories. If annealing is abbreviated, we must devote our attention to the purity of Al, and Si, Ti must be controlled to lower limit, as the improvement of conductivity by annealing is not expected.
This report turn the attention to above facts, then electrical conductivity and mechanical property of cold drawn wire without annealing lare been measured relating to the impurity of Fe and Si. And samples were worked to 86% reduction degrees through hot rolling and cold drawing.
The electrical conductivity of high pure aluminium (Fe: 0.001, Si: 0.010, Cu: 0.002, 99.987 Al) is 64.6%, and it decrease to about 61.0% by 0.40% Fe content and about 59.0% by 0.40% Si. The range which has better conductivity than 61.0% is Si_??_0.12, Fe_??_0.36, and more undesirable influences of Si than Fe are observed on the account of solid solubility of Si in Al.
As regards the mechanical property, influences of Si and Fe on the tensile strength are additional, viz. increases of about 5kg/mm2 as compared with high purity Al are observed due to 0.40% Si or Fe. Therefore it is more effective to the of increase tensile strength to rise Fe content with moderate amount of Si than to rise Fe alone. And tensile strength of some purity Al tend to show the maximum values when Fe/Si=1. On the other hand, elongations are between 2.5% and 3.5%, and they form a contrast tendency to the tensile strength to show higher values than 3% when Fe or Si contents are scarce and lower than 3% with considerable Fe and Si.
Conseguentry, the favourable contents of Si and Fe of Al for conductor wire will be Si: 0.08-0.12, Fe: 0.25-0.35%, considering with mechanical and electrical propertiesView full abstractDownload PDF (524K) -
KAMEKICHI SHIBA, MASABUMI UEDA1954 Volume 1954 Issue 11 Pages 21-24
Published: June 10, 1954
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe thermal conductivity of layers of air seperated by sheets of coaxial circular cylindrical aluminium foils at distances is discussed theoretically and confirmed by some experiments.View full abstractDownload PDF (445K) -
RIHEI KAWACHI1954 Volume 1954 Issue 11 Pages 25-34
Published: June 10, 1954
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSExperiments were carried out about the effects of preheating on the annealing characteristics of final product of high strength aluminum alloys (24S 61S 14S 75S Type) with or without Mn (and Cr)
In the case of alloys with Mn or Cr (except 61S), preheating of ingot reduces softening temperature and improves the ductility in annealed state. However, in the alloys without Mn and Cr preheating has no such effects, the ductility of anneald sheets being very good even in unpreheated samples.
Such an effect of preheating is very large in 14S., large in 24S, considerable in 75S, but negligibly small in 61S. These beneficial effects of preheating may be due to the reduction of Mn (or Cr) content in α phase.View full abstractDownload PDF (2087K) -
TAKASHI IKENO1954 Volume 1954 Issue 11 Pages 35-50
Published: June 10, 1954
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe effect of chemical composition, casting structure, hot rolling conditions or interval heat treatment prior to cold working on the recrystallization of cold rolled 2S sheets was investigated by means of the mechanical tests and the microscopic examinations.View full abstractDownload PDF (4710K) -
HIROMITSU HARIMOTO1954 Volume 1954 Issue 11 Pages 51-54
Published: June 10, 1954
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSWe studied the relation between aging and hydrogen evolution of the 17S alloy (Duralmin)
Samples were water quenched from 505°C, and then tempered at 130°C and 165°C. Aging duration were 1hr, 2hrs, 3hrs, 6hrs, 12hrs, 24hrs, 2days, 3days, 4days, 5days, 6days, and 7days.
After these heat-treatments, specimens were dipped in 10%NaOH solution for 30 minutes, and then measured their hydrogen evolution in 10%, 20%• and 30%HCl sodutions.
Conclusions:
1. The longer the dipping time, the more the hydrogen evolution.
2. It seemed that there is fluxiblerelation between aging and hydrogen evolution.View full abstractDownload PDF (380K) -
MASAO KATO, YASUJI NAKAMURA1954 Volume 1954 Issue 11 Pages 55-56
Published: June 10, 1954
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSOn the resistance to corrosion of Al-10%Mg alloy, the effect of Si and the difference of effects by both heat treatment processes according to JIS and DTD specification were examined.
(1) Ordinary statical corrosion test. The differences of corrosion resistivity of any specimen were little recognized.
(2) Stress corrosion test. Si seems to have little effect, while heat treatment processes affect appreciably, that is, the specimen according to DTD specification is more sensitive to stress corrosion.View full abstractDownload PDF (412K) -
EFFECTS OF MGANDSIUM (Part 1)MASAO KATO, YASUJI NAKAMURA1954 Volume 1954 Issue 11 Pages 58-66
Published: June 10, 1954
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe effect of impurities and heat-treatment on mechanical properties of aluminium casting alloys containing from 0 up to 16% magnesium were investigated.
1. The series of high pure alloys. In the as-cast state Mg contents up to 8% increase the strength but further additions reduce the ductility to low values because of the presence of increasing quantities of β-phase. The increase of proof stress is nearly proportional to Mg contents. An extended solution heat-treatment will dissolve more than 10%Mg. This solid solution is retained by quenching or air cooling, which results in excellent strength and ductility. In consequence, the maximum point of strength shifts to 11%Mg and the decreasing tendency of elongation is retarded up to 10%Mg, while the mechanical properties of alloys in portion of lower Mg content is little affected by heat-treatment.
2. The series of low pure alloys. In the as cast state the relations of mechanical properties to Mg content in portion of lower Mg content exhibit similar tendency as that of high pure alloys, although strength is higher and elongation is lower. And the maximum point of strength lies at 9%Mg. In the heattreated state this point shifts to 14%Mg and Mg contents up to 6% decrease the elongation but further additions increase it to maximum value at 14%.
3. The effect of Si is significant in whole series, especially to ductility of the alloys.View full abstractDownload PDF (990K) -
NOBUO SHIOTA1954 Volume 1954 Issue 11 Pages 67-75
Published: June 10, 1954
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe problem of occuluded gas into aluminum occupies a main part of all the faults in aluminum casting materials.
Although a number of investigators have studied on the problems, it is considered that the gas analytical methods being the essential problem are not enough sufficient. Various methods having been carried out up to date depend on almost chemical analysis by absorption method such as Orsat or Hempel type. In quantitative analysis by the above methods a small amount of gas analysis (10-4 c. c) is impossible as well as the complicated operation. The extracted gas from aluminum and its alloys is almost hydrogen diatomic gas and the characteristics of semi-conductors by thermister gauge are applied in this experiment, and so the results obtained are very exact.
The principle of thermal conductivity by the defference of cooling velocity at various gas composition surrounding the heated thermister element are utilized to this method. Especially the sensitivity for hydrogen gas is very high.
The characteristics from the results obtained are summarized as follows;
a) The sensible gas analysis even in solid state are possible.
b) By the direct reading of the microammeter, the volume of gas is obtained quickly.
c) An average diameter of the pin hole in high purity aluminum by electron microscope is proportional to the gas content.
d) The change of gas content has close relation to the condition of fluidity in the case of casting.
e) The defference between shrinkage cavity and pin hole or blow hole is recognized clearly by the thermister gauge.
f) The effective investigations about the relation between the soaking in slab and the blisters are detected from the author's experiment.
g) It is recognized that the dissolved gas exists in solution in the atomic or ionic state.View full abstractDownload PDF (1662K) -
NOBUO SHIOTA, TADAO FUJIMURA1954 Volume 1954 Issue 11 Pages 76-78,75
Published: June 10, 1954
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSIn the last papar we reported the result of investigation upon the relation between the effect of degasification and the volume of the remaining gas by means of the gas analysises in aluminium.
Here in this paper we give an account of the fact that the types of the casting mould and the grain size in solidification give a considerable influence to the remaining gas which lower the mechanical strength of the materials.
The experimental results obtainted are summarized as follows;
1. In casting by sand mould, the volume of extracted gas is higher than iron mould and that the specimen including gas is recognized to emit remarkably in the extraction of hydrogen gas even in solid state.
2. The effect of TiCl4 on grain refinement or degasification of molten aluminium is superior to that of boron refinement.View full abstractDownload PDF (696K) -
(PART 1.) THE ALUMINUM BINARY ALLOYSHIDEO YAMAGUCHI, SHOICHI SAKAMOTO, JUNGYO YAMAMOTO1954 Volume 1954 Issue 11 Pages 79-83
Published: June 10, 1954
Released on J-STAGE: October 30, 2008
JOURNAL FREE ACCESSThe cracking which sometimes occurs in the weld bead and in the adjacent metal is the most troublesome problem which arises in the fusion welding of aluminum and its alloys.
This work was carried out on binary alloys of aluminum with silicon, copper, magnesium, zinc, iron, manganese and chrome, all the alloys being prepared from aluminum with the purity of 99.99% and alloying elemments of the highest purity obtainable.
The results obtained are summarized as follows:
1) The welding crack of the oxyacetylene process is severer than that of the Argon-arc process.
2) Cracking differs with the support distance of restraint.
3) Aluminum alloys with iron, manganese and chrome are not subject to cracking by oxyacetylene process welding under very severe condition of restraint.
4) Binary aluminum alloys with wide range of solid solution such as magnesium, copper, silicon and zinc are very sensitive to cracking. The cracking becomes severe with the addition of these alloying element at first and after reaching a maximum point decreases till its reaches a constant value.View full abstractDownload PDF (1135K)
- |<
- <
- 1
- >
- >|